CVE-2023-4622

A use-after-free vulnerability in the Linux kernel's af_unix component can be exploited to achieve local privilege escalation.

The unix_stream_sendpage() function tries to add data to the last skb in the peer's recv queue without locking the queue. Thus there is a race where unix_stream_sendpage() could access an skb locklessly that is being released by garbage collection, resulting in use-after-free.

We recommend upgrading past commit 790c2f9d15b594350ae9bca7b236f2b1859de02c.

A use-after-free vulnerability in the Linux kernel's af_unix component can be exploited to achieve local privilege escalation. The unix_stream_sendpage() function tries to add data to the last skb in the peer's recv queue without locking the queue. Thus there is a race where unix_stream_sendpage() could access an skb locklessly that is being released by garbage collection, resulting in use-after-free. We recommend upgrading past commit 790c2f9d15b594350ae9bca7b236f2b1859de02c (or backported equivalents).

The Linux Kernel, the operating system core itself.

Security Fix(es):

A flaw was found in the Linux kernel's ksmbd, a high-performance in-kernel SMB server. The specific flaw exists within the handling of SMB2_SESSION_SETUP commands. The issue results from the lack of control of resource consumption. An attacker can leverage this vulnerability to create a denial-of-service condition on the system.(CVE-2023-32247)

A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to achieve local privilege escalation.

When nf_tables_delrule() is flushing table rules, it is not checked whether the chain is bound and the chain's owner rule can also release the objects in certain circumstances.

We recommend upgrading past commit 6eaf41e87a223ae6f8e7a28d6e78384ad7e407f8.

(CVE-2023-3777)

A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to achieve local privilege escalation.

On an error when building a nftables rule, deactivating immediate expressions in nft_immediate_deactivate() can lead unbinding the chain and objects be deactivated but later used.

We recommend upgrading past commit 0a771f7b266b02d262900c75f1e175c7fe76fec2.

(CVE-2023-4015)

A use-after-free vulnerability in the Linux kernel's net/sched: cls_route component can be exploited to achieve local privilege escalation.

When route4_change() is called on an existing filter, the whole tcf_result struct is always copied into the new instance of the filter. This causes a problem when updating a filter bound to a class, as tcf_unbind_filter() is always called on the old instance in the success path, decreasing filter_cnt of the still referenced class and allowing it to be deleted, leading to a use-after-free.

We recommend upgrading past commit b80b829e9e2c1b3f7aae34855e04d8f6ecaf13c8.

(CVE-2023-4206)

A use-after-free vulnerability in the Linux kernel's net/sched: cls_fw component can be exploited to achieve local privilege escalation.

When fw_change() is called on an existing filter, the whole tcf_result struct is always copied into the new instance of the filter. This causes a problem when updating a filter bound to a class, as tcf_unbind_filter() is always called on the old instance in the success path, decreasing filter_cnt of the still referenced class and allowing it to be deleted, leading to a use-after-free.

We recommend upgrading past commit 76e42ae831991c828cffa8c37736ebfb831ad5ec.

(CVE-2023-4207)

A use-after-free vulnerability in the Linux kernel's net/sched: cls_u32 component can be exploited to achieve local privilege escalation.

When u32_change() is called on an existing filter, the whole tcf_result struct is always copied into the new instance of the filter. This causes a problem when updating a filter bound to a class, as tcf_unbind_filter() is always called on the old instance in the success path, decreasing filter_cnt of the still referenced class and allowing it to be deleted, leading to a use-after-free.

We recommend upgrading past commit 3044b16e7c6fe5d24b1cdbcf1bd0a9d92d1ebd81.

(CVE-2023-4208)

A use-after-free vulnerability in the Linux kernel's af_unix component can be exploited to achieve local privilege escalation.

The unix_stream_sendpage() function tries to add data to the last skb in the peer's recv queue without locking the queue. Thus there is a race where unix_stream_sendpage() could access an skb locklessly that is being released by garbage collection, resulting in use-after-free.

We recommend upgrading past commit 790c2f9d15b594350ae9bca7b236f2b1859de02c.

(CVE-2023-4622)

The Linux Kernel, the operating system core itself.

Security Fix(es):

A flaw was found in the Linux kernel's ksmbd, a high-performance in-kernel SMB server. The specific flaw exists within the handling of SMB2_SESSION_SETUP commands. The issue results from the lack of control of resource consumption. An attacker can leverage this vulnerability to create a denial-of-service condition on the system.(CVE-2023-32247)

A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to achieve local privilege escalation.

When nf_tables_delrule() is flushing table rules, it is not checked whether the chain is bound and the chain's owner rule can also release the objects in certain circumstances.

We recommend upgrading past commit 6eaf41e87a223ae6f8e7a28d6e78384ad7e407f8.

(CVE-2023-3777)

A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to achieve local privilege escalation.

On an error when building a nftables rule, deactivating immediate expressions in nft_immediate_deactivate() can lead unbinding the chain and objects be deactivated but later used.

We recommend upgrading past commit 0a771f7b266b02d262900c75f1e175c7fe76fec2.

(CVE-2023-4015)

A use-after-free vulnerability in the Linux kernel's net/sched: cls_route component can be exploited to achieve local privilege escalation.

When route4_change() is called on an existing filter, the whole tcf_result struct is always copied into the new instance of the filter. This causes a problem when updating a filter bound to a class, as tcf_unbind_filter() is always called on the old instance in the success path, decreasing filter_cnt of the still referenced class and allowing it to be deleted, leading to a use-after-free.

We recommend upgrading past commit b80b829e9e2c1b3f7aae34855e04d8f6ecaf13c8.

(CVE-2023-4206)

A use-after-free vulnerability in the Linux kernel's net/sched: cls_fw component can be exploited to achieve local privilege escalation.

When fw_change() is called on an existing filter, the whole tcf_result struct is always copied into the new instance of the filter. This causes a problem when updating a filter bound to a class, as tcf_unbind_filter() is always called on the old instance in the success path, decreasing filter_cnt of the still referenced class and allowing it to be deleted, leading to a use-after-free.

We recommend upgrading past commit 76e42ae831991c828cffa8c37736ebfb831ad5ec.

(CVE-2023-4207)

A use-after-free vulnerability in the Linux kernel's net/sched: cls_u32 component can be exploited to achieve local privilege escalation.

When u32_change() is called on an existing filter, the whole tcf_result struct is always copied into the new instance of the filter. This causes a problem when updating a filter bound to a class, as tcf_unbind_filter() is always called on the old instance in the success path, decreasing filter_cnt of the still referenced class and allowing it to be deleted, leading to a use-after-free.

We recommend upgrading past commit 3044b16e7c6fe5d24b1cdbcf1bd0a9d92d1ebd81.

(CVE-2023-4208)

A use-after-free vulnerability in the Linux kernel's af_unix component can be exploited to achieve local privilege escalation.

The unix_stream_sendpage() function tries to add data to the last skb in the peer's recv queue without locking the queue. Thus there is a race where unix_stream_sendpage() could access an skb locklessly that is being released by garbage collection, resulting in use-after-free.

We recommend upgrading past commit 790c2f9d15b594350ae9bca7b236f2b1859de02c.

(CVE-2023-4622)

The Linux Kernel, the operating system core itself.

Security Fix(es):

A flaw was found in the Linux kernel's ksmbd, a high-performance in-kernel SMB server. The specific flaw exists within the handling of SMB2_SESSION_SETUP commands. The issue results from the lack of control of resource consumption. An attacker can leverage this vulnerability to create a denial-of-service condition on the system.(CVE-2023-32247)

A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to achieve local privilege escalation.

When nf_tables_delrule() is flushing table rules, it is not checked whether the chain is bound and the chain's owner rule can also release the objects in certain circumstances.

We recommend upgrading past commit 6eaf41e87a223ae6f8e7a28d6e78384ad7e407f8.

(CVE-2023-3777)

A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to achieve local privilege escalation.

On an error when building a nftables rule, deactivating immediate expressions in nft_immediate_deactivate() can lead unbinding the chain and objects be deactivated but later used.

We recommend upgrading past commit 0a771f7b266b02d262900c75f1e175c7fe76fec2.

(CVE-2023-4015)

A use-after-free vulnerability in the Linux kernel's net/sched: cls_route component can be exploited to achieve local privilege escalation.

When route4_change() is called on an existing filter, the whole tcf_result struct is always copied into the new instance of the filter. This causes a problem when updating a filter bound to a class, as tcf_unbind_filter() is always called on the old instance in the success path, decreasing filter_cnt of the still referenced class and allowing it to be deleted, leading to a use-after-free.

We recommend upgrading past commit b80b829e9e2c1b3f7aae34855e04d8f6ecaf13c8.

(CVE-2023-4206)

A use-after-free vulnerability in the Linux kernel's net/sched: cls_fw component can be exploited to achieve local privilege escalation.

When fw_change() is called on an existing filter, the whole tcf_result struct is always copied into the new instance of the filter. This causes a problem when updating a filter bound to a class, as tcf_unbind_filter() is always called on the old instance in the success path, decreasing filter_cnt of the still referenced class and allowing it to be deleted, leading to a use-after-free.

We recommend upgrading past commit 76e42ae831991c828cffa8c37736ebfb831ad5ec.

(CVE-2023-4207)

A use-after-free vulnerability in the Linux kernel's net/sched: cls_u32 component can be exploited to achieve local privilege escalation.

When u32_change() is called on an existing filter, the whole tcf_result struct is always copied into the new instance of the filter. This causes a problem when updating a filter bound to a class, as tcf_unbind_filter() is always called on the old instance in the success path, decreasing filter_cnt of the still referenced class and allowing it to be deleted, leading to a use-after-free.

We recommend upgrading past commit 3044b16e7c6fe5d24b1cdbcf1bd0a9d92d1ebd81.

(CVE-2023-4208)

A use-after-free vulnerability in the Linux kernel's af_unix component can be exploited to achieve local privilege escalation.

The unix_stream_sendpage() function tries to add data to the last skb in the peer's recv queue without locking the queue. Thus there is a race where unix_stream_sendpage() could access an skb locklessly that is being released by garbage collection, resulting in use-after-free.

We recommend upgrading past commit 790c2f9d15b594350ae9bca7b236f2b1859de02c.

(CVE-2023-4622)

The Linux Kernel, the operating system core itself.

Security Fix(es):

A use-after-free vulnerability in the Linux kernel's net/sched: cls_route component can be exploited to achieve local privilege escalation.

When route4_change() is called on an existing filter, the whole tcf_result struct is always copied into the new instance of the filter. This causes a problem when updating a filter bound to a class, as tcf_unbind_filter() is always called on the old instance in the success path, decreasing filter_cnt of the still referenced class and allowing it to be deleted, leading to a use-after-free.

We recommend upgrading past commit b80b829e9e2c1b3f7aae34855e04d8f6ecaf13c8.

(CVE-2023-4206)

A use-after-free vulnerability in the Linux kernel's net/sched: cls_fw component can be exploited to achieve local privilege escalation.

When fw_change() is called on an existing filter, the whole tcf_result struct is always copied into the new instance of the filter. This causes a problem when updating a filter bound to a class, as tcf_unbind_filter() is always called on the old instance in the success path, decreasing filter_cnt of the still referenced class and allowing it to be deleted, leading to a use-after-free.

We recommend upgrading past commit 76e42ae831991c828cffa8c37736ebfb831ad5ec.

(CVE-2023-4207)

A use-after-free vulnerability in the Linux kernel's net/sched: cls_u32 component can be exploited to achieve local privilege escalation.

When u32_change() is called on an existing filter, the whole tcf_result struct is always copied into the new instance of the filter. This causes a problem when updating a filter bound to a class, as tcf_unbind_filter() is always called on the old instance in the success path, decreasing filter_cnt of the still referenced class and allowing it to be deleted, leading to a use-after-free.

We recommend upgrading past commit 3044b16e7c6fe5d24b1cdbcf1bd0a9d92d1ebd81.

(CVE-2023-4208)

A use-after-free vulnerability in the Linux kernel's af_unix component can be exploited to achieve local privilege escalation.

The unix_stream_sendpage() function tries to add data to the last skb in the peer's recv queue without locking the queue. Thus there is a race where unix_stream_sendpage() could access an skb locklessly that is being released by garbage collection, resulting in use-after-free.

We recommend upgrading past commit 790c2f9d15b594350ae9bca7b236f2b1859de02c.

(CVE-2023-4622)

The Linux Kernel, the operating system core itself.

Security Fix(es):

A use-after-free vulnerability in the Linux kernel's net/sched: cls_route component can be exploited to achieve local privilege escalation.

When route4_change() is called on an existing filter, the whole tcf_result struct is always copied into the new instance of the filter. This causes a problem when updating a filter bound to a class, as tcf_unbind_filter() is always called on the old instance in the success path, decreasing filter_cnt of the still referenced class and allowing it to be deleted, leading to a use-after-free.

We recommend upgrading past commit b80b829e9e2c1b3f7aae34855e04d8f6ecaf13c8.

(CVE-2023-4206)

A use-after-free vulnerability in the Linux kernel's net/sched: cls_fw component can be exploited to achieve local privilege escalation.

When fw_change() is called on an existing filter, the whole tcf_result struct is always copied into the new instance of the filter. This causes a problem when updating a filter bound to a class, as tcf_unbind_filter() is always called on the old instance in the success path, decreasing filter_cnt of the still referenced class and allowing it to be deleted, leading to a use-after-free.

We recommend upgrading past commit 76e42ae831991c828cffa8c37736ebfb831ad5ec.

(CVE-2023-4207)

A use-after-free vulnerability in the Linux kernel's net/sched: cls_u32 component can be exploited to achieve local privilege escalation.

When u32_change() is called on an existing filter, the whole tcf_result struct is always copied into the new instance of the filter. This causes a problem when updating a filter bound to a class, as tcf_unbind_filter() is always called on the old instance in the success path, decreasing filter_cnt of the still referenced class and allowing it to be deleted, leading to a use-after-free.

We recommend upgrading past commit 3044b16e7c6fe5d24b1cdbcf1bd0a9d92d1ebd81.

(CVE-2023-4208)

A use-after-free vulnerability in the Linux kernel's af_unix component can be exploited to achieve local privilege escalation.

The unix_stream_sendpage() function tries to add data to the last skb in the peer's recv queue without locking the queue. Thus there is a race where unix_stream_sendpage() could access an skb locklessly that is being released by garbage collection, resulting in use-after-free.

We recommend upgrading past commit 790c2f9d15b594350ae9bca7b236f2b1859de02c.

(CVE-2023-4622)

A use-after-free vulnerability in the Linux kernel's af_unix component can be exploited to achieve local privilege escalation. The unix_stream_sendpage() function tries to add data to the last skb in the peer's recv queue without locking the queue. Thus there is a race where unix_stream_sendpage() could access an skb locklessly that is being released by garbage collection, resulting in use-after-free. We recommend upgrading past commit 790c2f9d15b594350ae9bca7b236f2b1859de02c (or backported equivalents).

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• kernel: use after free in unix_stream_sendpage (CVE-2023-4622)
• kernel: vmwgfx: reference count issue leads to use-after-free in surface handling (CVE-2023-5633)
• kernel: netfilter: potential slab-out-of-bound access due to integer underflow (CVE-2023-42753)
• Kernel: UAF during login when accessing the shost ipaddress (CVE-2023-2162)
• hw amd: Return Address Predictor vulnerability leading to information disclosure (CVE-2023-20569)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Bug Fix(es):

• Backport OVS l4 Symmetric Hashing to almalinux-8 (JIRA:AlmaLinux-12746)
• Unbounded memory usage by TCP for receive buffers (JIRA:AlmaLinux-15096)
• various kind of guests freeze on rhel 8.8 (JIRA:AlmaLinux-15121)
• AlmaLinux 8: netfilter: conntrack: Fix gre tunneling over ipv6 (JIRA:AlmaLinux-15259)
• NFSv4.1 needs to handle ENOENT error from GETDEVICEINFO (JIRA:AlmaLinux-16407)
• DM multipath showing failed path for an nvme-o-FC LUN when performing I/O operations (JIRA:AlmaLinux-14718)

In unix_stream_sendpage of af_unix.c, there is a possible use-after-free due to a race condition. This could lead to local escalation of privilege in the kernel with no additional execution privileges needed. User interaction is not needed for exploitation.

• CVE-url: https://ubuntu.com/security/CVE-2023-4622
  • af_unix: Fix null-ptr-deref in unix_stream_sendpage().
• Jammy update: v5.15.105 upstream stable release (LP: #2023230) // CVE-url: https://ubuntu.com/security/CVE-2022-4269
  • net/sched: act_mirred: better wording on protection against excessive stack growth
  • act_mirred: use the backlog for nested calls to mirred ingress
• CVE-url: https://ubuntu.com/security/CVE-2022-4269
  • net/sched: user-space can't set unknown tcfa_action values
  • net/tc: introduce TC_ACT_REINSERT.
  • act_mirred: use TC_ACT_REINSERT when possible
  • net: sched: act_mirred method rename for grep-ability and consistency
  • net: sched: protect against stack overflow in TC act_mirred
  • net/sched: act_mirred: refactor the handle of xmit
  • selftests: forwarding: Introduce tc actions tests
• Jammy update: v5.15.94 upstream stable release (LP: #2012673) // CVE-url: https://ubuntu.com/security/CVE-2022-27672
  • x86/speculation: Identify processors vulnerable to SMT RSB predictions
  • KVM: x86: Mitigate the cross-thread return address predictions bug
  • Documentation/hw-vuln: Add documentation for Cross-Thread Return Predictions
• CVE-url: https://ubuntu.com/security/CVE-2022-27672
  • KVM: x86: drop bogus MWAIT check
  • KVM: x86: simplify kvm_mwait_in_guest()
  • KVM: X86: Provide a capability to disable MWAIT intercepts
  • KVM: X86: Provide a capability to disable HLT intercepts
  • KVM: VMX: Remove redundant write to set vCPU as active at RESET/INIT
  • KVM: X86: Provide a capability to disable PAUSE intercepts
  • x86/headers/UAPI: Move DISABLE_EXITS KVM capability bits to the UAPI
  • tools headers kvm: Sync uapi/linux/kvm.h with the kernel sources
  • KVM: X86: Provide a capability to disable cstate msr read intercepts
• Jammy update: v5.15.110 upstream stable release (LP: #2025090) // CVE-url: https://ubuntu.com/security/CVE-2023-2002
  • bluetooth: Perform careful capability checks in hci_sock_ioctl()
• Jammy update: v5.15.80 upstream stable release (LP: #2003122) // CVE-url: https://ubuntu.com/security/CVE-2022-3169
  • nvme: ensure subsystem reset is single threaded
• CVE-url: https://ubuntu.com/security/CVE-2022-3169
  • nvme: host delete_work and reset_work on separate workqueues
  • PCI/ASPM: Add pcie_aspm_enabled()
  • nvme-pci: Allow PCI bus-level PM to be used if ASPM is disabled
  • nvme: Prevent resets during paused controller state
  • nvme: Add quirk for LiteON CL1 devices running FW 22301111
  • nvme: Wait for reset state when required
• Jammy update: v5.15.81 upstream stable release (LP: #2003130) // CVE-url: https://ubuntu.com/security/CVE-2022-47519
  • wifi: wilc1000: validate length of IEEE80211_P2P_ATTR_OPER_CHANNEL attribute
• CVE-2022-47520 // CVE-url: https://ubuntu.com/security/CVE-2022-47520
  • wifi: wilc1000: validate pairwise and authentication suite offsets
• CVE-url: https://ubuntu.com/security/CVE-2022-45919
  • media: dvb-core: Fix use-after-free due to race condition at dvb_ca_en50221

• CVE-url: https://ubuntu.com/security/CVE-2023-4622
  • af_unix: Fix null-ptr-deref in unix_stream_sendpage().
• Jammy update: v5.15.105 upstream stable release (LP: #2023230) // CVE-url: https://ubuntu.com/security/CVE-2022-4269
  • net/sched: act_mirred: better wording on protection against excessive stack growth
  • act_mirred: use the backlog for nested calls to mirred ingress
• CVE-url: https://ubuntu.com/security/CVE-2022-4269
  • net/sched: user-space can't set unknown tcfa_action values
  • net/tc: introduce TC_ACT_REINSERT.
  • act_mirred: use TC_ACT_REINSERT when possible
  • net: sched: act_mirred method rename for grep-ability and consistency
  • net: sched: protect against stack overflow in TC act_mirred
  • net/sched: act_mirred: refactor the handle of xmit
  • selftests: forwarding: Introduce tc actions tests
• Jammy update: v5.15.94 upstream stable release (LP: #2012673) // CVE-url: https://ubuntu.com/security/CVE-2022-27672
  • x86/speculation: Identify processors vulnerable to SMT RSB predictions
  • KVM: x86: Mitigate the cross-thread return address predictions bug
  • Documentation/hw-vuln: Add documentation for Cross-Thread Return Predictions
• CVE-url: https://ubuntu.com/security/CVE-2022-27672
  • KVM: x86: drop bogus MWAIT check
  • KVM: x86: simplify kvm_mwait_in_guest()
  • KVM: X86: Provide a capability to disable MWAIT intercepts
  • KVM: X86: Provide a capability to disable HLT intercepts
  • KVM: VMX: Remove redundant write to set vCPU as active at RESET/INIT
  • KVM: X86: Provide a capability to disable PAUSE intercepts
  • x86/headers/UAPI: Move DISABLE_EXITS KVM capability bits to the UAPI
  • tools headers kvm: Sync uapi/linux/kvm.h with the kernel sources
  • KVM: X86: Provide a capability to disable cstate msr read intercepts
• Jammy update: v5.15.110 upstream stable release (LP: #2025090) // CVE-url: https://ubuntu.com/security/CVE-2023-2002
  • bluetooth: Perform careful capability checks in hci_sock_ioctl()
• Jammy update: v5.15.80 upstream stable release (LP: #2003122) // CVE-url: https://ubuntu.com/security/CVE-2022-3169
  • nvme: ensure subsystem reset is single threaded
• CVE-url: https://ubuntu.com/security/CVE-2022-3169
  • nvme: host delete_work and reset_work on separate workqueues
  • PCI/ASPM: Add pcie_aspm_enabled()
  • nvme-pci: Allow PCI bus-level PM to be used if ASPM is disabled
  • nvme: Prevent resets during paused controller state
  • nvme: Add quirk for LiteON CL1 devices running FW 22301111
  • nvme: Wait for reset state when required
• Jammy update: v5.15.81 upstream stable release (LP: #2003130) // CVE-url: https://ubuntu.com/security/CVE-2022-47519
  • wifi: wilc1000: validate length of IEEE80211_P2P_ATTR_OPER_CHANNEL attribute
• CVE-2022-47520 // CVE-url: https://ubuntu.com/security/CVE-2022-47520
  • wifi: wilc1000: validate pairwise and authentication suite offsets
• CVE-url: https://ubuntu.com/security/CVE-2022-45919
  • media: dvb-core: Fix use-after-free due to race condition at dvb_ca_en50221

• Bionic update: upstream stable patchset 2022-12-01 (LP: #1998542) // CVE-2022-26373
  • x86/speculation: Add RSB VM Exit protections
• Bionic update: upstream stable patchset 2022-12-01 (LP: #1998542)
  • Revert "x86/cpu: Add a steppings field to struct x86_cpu_id"
  • x86/cpufeature: Add facility to check for min microcode revisions
  • x86/cpufeature: Fix various quality problems in the <asm/cpu_device_hd.h> header
  • x86/devicetable: Move x86 specific macro out of generic code
  • x86/cpu: Add consistent CPU match macros
  • x86/cpu: Add a steppings field to struct x86_cpu_id
  • x86/cpufeatures: Move RETPOLINE flags to word 11
  • x86/bugs: Report AMD retbleed vulnerability
  • x86/bugs: Keep a per-CPU IA32_SPEC_CTRL value
  • x86/entry: Add kernel IBRS implementation
  • x86/speculation: Add spectre_v2=ibrs option to support Kernel IBRS
  • x86/speculation: Add LFENCE to RSB fill sequence
  • KVM: VMX: Prevent guest RSB poisoning attacks with eIBRS
  • x86/speculation: Fill RSB on vmexit for IBRS
  • x86/cpu/amd: Enumerate BTC_NO
  • x86/speculation: Disable RRSBA behavior
  • x86/bugs: Warn when "ibrs" mitigation is selected on Enhanced IBRS parts
• Bionic update: upstream stable patchset 2022-12-01 (LP: #1998542) // CVE-2022-29901
  • x86/bugs: Optimize SPEC_CTRL MSR writes
  • x86/bugs: Split spectre_v2_select_mitigation() and spectre_v2_user_select_mitigation()
  • x86/bugs: Report Intel retbleed vulnerability
  • entel_idle: Disable IBRS during long idle
  • x86/speculation: Change FILL_RETURN_BUFFER to work with objtool
  • x86/speculation: Fix RSB filling with CONFIG_RETPOLINE=n
  • x86/speculation: Fix firmware entry SPEC_CTRL handling
  • x86/speculation: Fix SPEC_CTRL write on SMT state change
  • x86/speculation: Use cached host SPEC_CTRL value for guest entry/exit
  • x86/speculation: Remove x86_spec_ctrl_mask
  • x86/common: Stamp out the stepping madness
  • x86/bugs: Add Cannon lake to RETBleed affected CPU list
  • x86/speculation: Use DECLARE_PER_CPU for x86_spec_ctrl_current
• Bionic update: upstream stable patchset 2022-12-01 (LP: #1998542) // CVE-2022-29900
  • x86/bugs: Add AMD retbleed= boot parameter
• Bionic update: upstream stable patchset 2022-10-06 (LP: #1992112)
  • x86/bugs: Add "unknown" reporting for MMIO Stale Data
• CVE-2021-26401
  • x86/speculation: Warn about Spectre v2 LFENCE mitigation
  • x86/speculation: Warn about eIBRS + LFENCE + Unprivileged eBPF + SMT
• CVE-2022-0001
  • x86/speculation: Include unprivileged eBPF status in Spectre v2 mitigation reporting
• Bionic update: upstream stable patchset 2019-10-07 (LP: #1847155)
  • x86/cpu: Add Tiger Lake to Intel family
• CVE-url: https://ubuntu.com/security/CVE-2023-4622
  • af_unix: Fix null-ptr-deref in unix_stream_sendpage().
• CVE-url: https://ubuntu.com/security/CVE-2022-45919
  • media: dvb-core: Fix use-after-free due to race condition at dvb_ca_en50221
• Miscellaneous upstream changes
  • Revert "x86/enter: Use IBRS on syscall and interrupts"

• Bionic update: upstream stable patchset 2022-12-01 (LP: #1998542) // CVE-2022-26373
  • x86/speculation: Add RSB VM Exit protections
• Bionic update: upstream stable patchset 2022-12-01 (LP: #1998542)
  • Revert "x86/cpu: Add a steppings field to struct x86_cpu_id"
  • x86/cpufeature: Add facility to check for min microcode revisions
  • x86/cpufeature: Fix various quality problems in the <asm/cpu_device_hd.h> header
  • x86/devicetable: Move x86 specific macro out of generic code
  • x86/cpu: Add consistent CPU match macros
  • x86/cpu: Add a steppings field to struct x86_cpu_id
  • x86/cpufeatures: Move RETPOLINE flags to word 11
  • x86/bugs: Report AMD retbleed vulnerability
  • x86/bugs: Keep a per-CPU IA32_SPEC_CTRL value
  • x86/entry: Add kernel IBRS implementation
  • x86/speculation: Add spectre_v2=ibrs option to support Kernel IBRS
  • x86/speculation: Add LFENCE to RSB fill sequence
  • KVM: VMX: Prevent guest RSB poisoning attacks with eIBRS
  • x86/speculation: Fill RSB on vmexit for IBRS
  • x86/cpu/amd: Enumerate BTC_NO
  • x86/speculation: Disable RRSBA behavior
  • x86/bugs: Warn when "ibrs" mitigation is selected on Enhanced IBRS parts
• Bionic update: upstream stable patchset 2022-12-01 (LP: #1998542) // CVE-2022-29901
  • x86/bugs: Optimize SPEC_CTRL MSR writes
  • x86/bugs: Split spectre_v2_select_mitigation() and spectre_v2_user_select_mitigation()
  • x86/bugs: Report Intel retbleed vulnerability
  • entel_idle: Disable IBRS during long idle
  • x86/speculation: Change FILL_RETURN_BUFFER to work with objtool
  • x86/speculation: Fix RSB filling with CONFIG_RETPOLINE=n
  • x86/speculation: Fix firmware entry SPEC_CTRL handling
  • x86/speculation: Fix SPEC_CTRL write on SMT state change
  • x86/speculation: Use cached host SPEC_CTRL value for guest entry/exit
  • x86/speculation: Remove x86_spec_ctrl_mask
  • x86/common: Stamp out the stepping madness
  • x86/bugs: Add Cannon lake to RETBleed affected CPU list
  • x86/speculation: Use DECLARE_PER_CPU for x86_spec_ctrl_current
• Bionic update: upstream stable patchset 2022-12-01 (LP: #1998542) // CVE-2022-29900
  • x86/bugs: Add AMD retbleed= boot parameter
• Bionic update: upstream stable patchset 2022-10-06 (LP: #1992112)
  • x86/bugs: Add "unknown" reporting for MMIO Stale Data
• CVE-2021-26401
  • x86/speculation: Warn about Spectre v2 LFENCE mitigation
  • x86/speculation: Warn about eIBRS + LFENCE + Unprivileged eBPF + SMT
• CVE-2022-0001
  • x86/speculation: Include unprivileged eBPF status in Spectre v2 mitigation reporting
• Bionic update: upstream stable patchset 2019-10-07 (LP: #1847155)
  • x86/cpu: Add Tiger Lake to Intel family
• CVE-url: https://ubuntu.com/security/CVE-2023-4622
  • af_unix: Fix null-ptr-deref in unix_stream_sendpage().
• CVE-url: https://ubuntu.com/security/CVE-2022-45919
  • media: dvb-core: Fix use-after-free due to race condition at dvb_ca_en50221
• Miscellaneous upstream changes
  • Revert "x86/enter: Use IBRS on syscall and interrupts"

• IB/hfi1: Fix bugs with non-PAGE_SIZE-end multi-iovec user SDMA requests {CVE-2023-52474}
• af_unix: Fix null-ptr-deref in unix_stream_sendpage(). {CVE-2023-4622}
• sched/rt: pick_next_rt_entity(): check list_entry {CVE-2023-1077}
• RDMA/irdma: Prevent zero-length STAG registration {CVE-2023-25775}
• block: add check that partition length needs to be aligned with block size {CVE-2023-52458}
• bpf: Reject variable offset alu on PTR_TO_FLOW_KEYS {CVE-2024-26589}
• bpf: fix check for attempt to corrupt spilled pointer {CVE-2023-52462}
• KVM: arm64: vgic-its: Avoid potential UAF in LPI translation cache {CVE-2024-26598}
• ext4: regenerate buddy after block freeing failed if under fc replay {CVE-2024-26601}
• ext4: allow ext4_get_group_info() to fail {CVE-2024-26601}
• mlxsw: spectrum_acl_tcam: Fix stack corruption {CVE-2024-26586}
• EDAC/thunderx: Fix possible out-of-bounds string access {CVE-2023-52464}
• drm/radeon: check the alloc_workqueue return value in radeon_crtc_init() {CVE-2023-52470}
• drivers/amd/pm: fix a use-after-free in kv_parse_power_table {CVE-2023-52469}
• md/raid5: fix atomicity violation in raid5_cache_count {CVE-2024-23307}
• igb: set max size RX buffer when store bad packet is enabled {CVE-2023-45871}
• netfilter: nft_set_rbtree: skip end interval element from gc {CVE-2024-26581}
• netfilter: nf_tables: check if catch-all set element is active in next generation {CVE-2024-1085}
• netfilter: nf_tables: skip set commit for deleted/destroyed sets {CVE-2024-0193}
• netfilter: nft_set_pipapo: skip inactive elements during set walk {CVE-2023-6817}
• netfilter: nf_tables: split async and sync catchall in two functions {CVE-2023-4244}
• netfilter: nf_tables: remove catchall element in GC sync path {CVE-2023-4244}
• netfilter: nf_tables: expose opaque set element as struct nft_elem_priv {CVE-2023-4244}
• netfilter: nf_tables: set backend .flush always succeeds {CVE-2023-4244}
• netfilter: nft_set_pipapo: no need to call pipapo_deactivate() from flush {CVE-2023-4244}
• netfilter: nf_tables: work around newrule after chain binding {CVE-2023-4244}
• netfilter: nf_tables: nft_set_rbtree: fix spurious insertion failure {CVE-2023-4244}
• netfilter: nf_tables: fix memleak when more than 255 elements expired {CVE-2023-4244}
• netfilter: nf_tables: disable toggling dormant table state more than once {CVE-2023-4244}
• netfilter: nf_tables: disallow element removal on anonymous sets {CVE-2023-4244}
• netfilter: nft_set_hash: try later when GC hits EAGAIN on iteration {CVE-2023-4244}
• netfilter: nft_set_pipapo: stop GC iteration if GC transaction allocation fails {CVE-2023-4244}
• netfilter: nft_set_rbtree: use read spinlock to avoid datapath contention {CVE-2023-4244}
• netfilter: nft_set_pipapo: call nft_trans_gc_queue_sync() in catchall GC {CVE-2023-4244}
• netfilter: nf_tables: disallow rule removal from chain binding {CVE-2023-4244}
• netfilter: nft_set_rbtree: skip sync GC for new elements in this transaction {CVE-2023-4244}
• netfilter: nf_tables: defer gc run if previous batch is still pending {CVE-2023-4244}
• netfilter: nf_tables: fix out of memory error handling {CVE-2023-4244}
• netfilter: nf_tables: use correct lock to protect gc_list {CVE-2023-4244}
• netfilter: nf_tables: GC transaction race with abort path {CVE-2023-4244}
• netfilter: nf_tables: flush pending destroy work before netlink notifier {CVE-2023-4244}
• netfilter: nft_dynset: disallow object maps {CVE-2023-4244}
• netfilter: nf_tables: GC transaction race with netns dismantle {CVE-2023-4244}
• netfilter: nf_tables: fix GC transaction races with netns and netlink event exit path {CVE-2023-4244}
• netfilter: nf_tables: don't fail inserts if duplicate has expired {CVE-2023-4244}
• netfilter: nf_tables: deactivate catchall elements in next generation {CVE-2023-4244}
• netfilter: nf_tables: fix kdoc warnings after gc rework {CVE-2023-4244}
• netfilter: nf_tables: fix false-positive lockdep splat {CVE-2023-4244}
• netfilter: nf_tables: remove busy mark and…

• ima: Fix use-after-free on a dentry's dname.name {CVE-2024-39494}
• ima: define ima_max_digest_data struct without a flexible array variable
• ima: detect changes to the backing overlay file
• tcp: Use refcount_inc_not_zero() in tcp_twsk_unique(). {CVE-2024-36904}
• af_unix: Fix garbage collector racing against connect() {CVE-2024-26923}
• net/ipv6: avoid possible UAF in ip6_route_mpath_notify() {CVE-2024-26852}
• net/mlx5: Fix a race on command flush flow {CVE-2022-48858}
• sctp: fix kernel-infoleak for SCTP sockets {CVE-2022-48855}
• libbpf: Fix use-after-free in btf_dump_name_dups {CVE-2022-3534}
• net: fix __dst_negative_advice() race {CVE-2024-36971}
• ext4: fix kernel BUG in 'ext4_write_inline_data_end()' {CVE-2021-33631}
• tipc: fix UAF in error path {CVE-2024-36886}
• smb: client: fix parsing of SMB3.1.1 POSIX create context {CVE-2023-52434}
• smb: client: fix potential OOBs in smb2_parse_contexts() {CVE-2023-52434}
• perf: Disallow mis-matched inherited group reads {CVE-2023-5717}
• af_unix: Fix null-ptr-deref in unix_stream_sendpage(). {CVE-2023-4622}
• sched/rt: pick_next_rt_entity(): check list_entry {CVE-2023-1077}
• i2c: Fix a potential use after free {CVE-2019-25162}

• ima: Fix use-after-free on a dentry's dname.name {CVE-2024-39494}
• ima: define ima_max_digest_data struct without a flexible array variable
• ima: detect changes to the backing overlay file
• tcp: Use refcount_inc_not_zero() in tcp_twsk_unique(). {CVE-2024-36904}
• af_unix: Fix garbage collector racing against connect() {CVE-2024-26923}
• net/ipv6: avoid possible UAF in ip6_route_mpath_notify() {CVE-2024-26852}
• net/mlx5: Fix a race on command flush flow {CVE-2022-48858}
• sctp: fix kernel-infoleak for SCTP sockets {CVE-2022-48855}
• bpf: Add MEM_RDONLY for helper args that are pointers to rdonly mem. {CVE-2022-0500}
• bpf: Make per_cpu_ptr return rdonly PTR_TO_MEM. {CVE-2022-0500}
• bpf: Introduce MEM_RDONLY flag {CVE-2022-0500}
• bpf: Replace PTR_TO_XXX_OR_NULL with PTR_TO_XXX | PTR_MAYBE_NULL {CVE-2022-0500}
• bpf: Replace RET_XXX_OR_NULL with RET_XXX | PTR_MAYBE_NULL {CVE-2022-0500}
• bpf: Replace ARG_XXX_OR_NULL with ARG_XXX | PTR_MAYBE_NULL {CVE-2022-0500}
• bpf: Introduce composable reg, ret and arg types. {CVE-2022-0500}
• bpf: Extract nullable reg type conversion into a helper function {CVE-2022-0500}
• bpf: Rename bpf_reg_state variables {CVE-2022-0500}
• libbpf: Fix use-after-free in btf_dump_name_dups {CVE-2022-3534}
• net: fix __dst_negative_advice() race {CVE-2024-36971}
• ext4: fix kernel BUG in 'ext4_write_inline_data_end()' {CVE-2021-33631}
• tipc: fix UAF in error path {CVE-2024-36886}
• smb: client: fix parsing of SMB3.1.1 POSIX create context {CVE-2023-52434}
• smb: client: fix potential OOBs in smb2_parse_contexts() {CVE-2023-52434}
• perf: Disallow mis-matched inherited group reads {CVE-2023-5717}
• af_unix: Fix null-ptr-deref in unix_stream_sendpage(). {CVE-2023-4622}
• sched/rt: pick_next_rt_entity(): check list_entry {CVE-2023-1077}
• i2c: Fix a potential use after free {CVE-2019-25162}

It was discovered that the Xen netback driver in the Linux kernel did not properly handle packets structured in certain ways. An attacker in a guest VM could possibly use this to cause a denial of service (host NIC availability).(CVE-2022-3643)

It was discovered that the virtual terminal driver in the Linux kernel contained a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly expose sensitive information (kernel memory).(CVE-2023-3567)

It was discovered that the universal 32bit network packet classifier implementation in the Linux kernel did not properly perform reference counting in some situations, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.(CVE-2023-3609)

It was discovered that the network packet classifier with netfilter/firewall marks implementation in the Linux kernel did not properly handle reference counting, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.(CVE-2023-3776)

Kevin Rich discovered that the netfilter subsystem in the Linux kernel did not properly handle table rules flush in certain circumstances. A local attacker could possibly use this to cause a denial of service (system crash) or execute arbitrary code.(CVE-2023-3777)

Kevin Rich discovered that the netfilter subsystem in the Linux kernel did not properly handle rule additions to bound chains in certain circumstances. A local attacker could possibly use this to cause a denial of service (system crash) or execute arbitrary code.(CVE-2023-3995)

It was discovered that the netfilter subsystem in the Linux kernel did not properly handle PIPAPO element removal, leading to a use-after-free vulnerability. A local attacker could possibly use this to cause a denial of service (system crash) or execute arbitrary code.(CVE-2023-4004)

Bing-Jhong Billy Jheng discovered that the Unix domain socket implementation in the Linux kernel contained a race condition in certain situations, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.(CVE-2023-4622)

Budimir Markovic discovered that the qdisc implementation in the Linux kernel did not properly validate inner classes, leading to a use-after-free vulnerability. A local user could use this to cause a denial of service (system crash) or possibly execute arbitrary code.(CVE-2023-4623)

Alex Birnberg discovered that the netfilter subsystem in the Linux kernel did not properly validate register length, leading to an out-of- bounds write vulnerability. A local attacker could possibly use this to cause a denial of service (system crash).(CVE-2023-4881)

Kevin Rich discovered that the netfilter subsystem in the Linux kernel did not properly handle removal of rules from chain bindings in certain circumstances, leading to a use-after-free vulnerability. A local attacker could possibly use this to cause a denial of service (system crash) or execute arbitrary code.(CVE-2023-5197)

Gwangun Jung discovered that the Quick Fair Queueing scheduler implementation in the Linux kernel contained an out-of-bounds write vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.(CVE-2023-31436)

Ross Lagerwall discovered that the Xen netback backend driver in the Linux kernel did not properly handle certain unusual packets from a paravirtualized network frontend, leading to a buffer overflow. An attacker in a guest VM could use this to cause a denial of service (host system crash) or possibly execute arbitrary code.(CVE-2023-34319)

It was discovered that the bluetooth subsystem in the Linux kernel did not properly handle L2CAP socket release, leading to a use-after-free vulnerability. A local…

The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

• kernel: use after free in unix_stream_sendpage (CVE-2023-4622)

• kernel: vmwgfx: reference count issue leads to use-after-free in surface handling (CVE-2023-5633)

• kernel: netfilter: potential slab-out-of-bound access due to integer underflow (CVE-2023-42753)

• Kernel: UAF during login when accessing the shost ipaddress (CVE-2023-2162)

• hw amd: Return Address Predictor vulnerability leading to information disclosure (CVE-2023-20569)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Bug Fix(es):

• kernel-rt: update RT source tree to the latest Rocky Linux-8.9.z1 Batch (JIRA:Rocky Linux-17347)