CVE-2023-53032

The Linux Kernel, the operating system core itself.

Security Fix(es):

In the Linux kernel, the following vulnerability has been resolved:

can: dev: can_get_echo_skb(): prevent call to kfree_skb() in hard IRQ context

If a driver calls can_get_echo_skb() during a hardware IRQ (which is often, but not always, the case), the 'WARN_ON(in_irq)' in net/core/skbuff.c#skb_release_head_state() might be triggered, under network congestion circumstances, together with the potential risk of a NULL pointer dereference.

The root cause of this issue is the call to kfree_skb() instead of dev_kfree_skb_irq() in net/core/dev.c#enqueue_to_backlog().

This patch prevents the skb to be freed within the call to netif_rx() by incrementing its reference count with skb_get(). The skb is finally freed by one of the in-irq-context safe functions: dev_consume_skb_any() or dev_kfree_skb_any(). The "any" version is used because some drivers might call can_get_echo_skb() in a normal context.

The reason for this issue to occur is that initially, in the core network stack, loopback skb were not supposed to be received in hardware IRQ context. The CAN stack is an exeption.

This bug was previously reported back in 2017 in [1] but the proposed patch never got accepted.

While [1] directly modifies net/core/dev.c, we try to propose here a smoother modification local to CAN network stack (the assumption behind is that only CAN devices are affected by this issue).

[1] http://lore.kernel.org/r/[email protected](CVE-2020-36789)

In the Linux kernel, the following vulnerability has been resolved:

video: fbdev: cirrusfb: check pixclock to avoid divide by zero

Do a sanity check on pixclock value to avoid divide by zero.

If the pixclock value is zero, the cirrusfb driver will round up pixclock to get the derived frequency as close to maxclock as possible.

Syzkaller reported a divide error in cirrusfb_check_pixclock.

divide error: 0000 [#1] SMP KASAN PTI CPU: 0 PID: 14938 Comm: cirrusfb_test Not tainted 5.15.0-rc6 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-2 RIP: 0010:cirrusfb_check_var+0x6f1/0x1260

Call Trace: fb_set_var+0x398/0xf90 do_fb_ioctl+0x4b8/0x6f0 fb_ioctl+0xeb/0x130 __x64_sys_ioctl+0x19d/0x220 do_syscall_64+0x3a/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae(CVE-2021-47641)

In the Linux kernel, the following vulnerability has been resolved:

can: dev: can_restart: fix use after free bug

After calling netif_rx_ni(skb), dereferencing skb is unsafe. Especially, the can_frame cf which aliases skb memory is accessed after the netif_rx_ni() in: stats->rx_bytes += cf->len;

Reordering the lines solves the issue.(CVE-2021-47668)

In the Linux kernel, the following vulnerability has been resolved:

can: peak_usb: fix use after free bugs

After calling peak_usb_netif_rx_ni(skb), dereferencing skb is unsafe. Especially, the can_frame cf which aliases skb memory is accessed after the peak_usb_netif_rx_ni().

Reordering the lines solves the issue.(CVE-2021-47670)

In the Linux kernel, the following vulnerability has been resolved:

qede: confirm skb is allocated before using

qede_build_skb() assumes build_skb() always works and goes straight to skb_reserve(). However, build_skb() can fail under memory pressure. This results in a kernel panic because the skb to reserve is NULL.

Add a check in case build_skb() failed to allocate and return NULL.

The NULL return is handled correctly in callers to qede_build_skb().(CVE-2022-49084)

In the Linux kernel, the following vulnerability has been resolved:

net: openvswitch: fix leak of nested actions

While parsing user-provided actions, openvswitch module may dynamically allocate memory and store pointers in the internal copy of the actions. So this memory has to be freed while destroying the actions.

Currently there are only two such actions: ct() and set(). However, there are many actions that can hold nested lists…

In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: Fix overflow before widen in the bitmap_ip_create() function. When first_ip is 0, last_ip is 0xFFFFFFFF, and netmask is 31, the value of an arithmetic expression 2 << (netmask - mask_bits - 1) is subject to overflow due to a failure casting operands to a larger data type before performing the arithmetic. Note that it's harmless since the value will be checked at the next step. Found by InfoTeCS on behalf of Linux Verification Center (linuxtesting.org) with SVACE.

In the Linux kernel, the following vulnerability has been resolved:

netfilter: ipset: Fix overflow before widen in the bitmap_ip_create() function.

When first_ip is 0, last_ip is 0xFFFFFFFF, and netmask is 31, the value of an arithmetic expression 2 << (netmask - mask_bits - 1) is subject to overflow due to a failure casting operands to a larger data type before performing the arithmetic.

Note that it's harmless since the value will be checked at the next step.

Found by InfoTeCS on behalf of Linux Verification Center (linuxtesting.org) with SVACE.

The SUSE Linux Enterprise 12 SP5 kernel was updated to receive various security bugfixes.

The following security bugs were fixed:

• CVE-2021-47659: drm/plane: Move range check for format_count earlier (bsc#1237839).
• CVE-2022-49044: dm integrity: fix memory corruption when tag_size is less than digest size (bsc#1237840).
• CVE-2022-49055: drm/amdkfd: Check for potential null return of kmalloc_array() (bsc#1237868).
• CVE-2022-49060: net/smc: Fix NULL pointer dereference in smc_pnet_find_ib() (bsc#1237845).
• CVE-2022-49086: net: openvswitch: fix leak of nested actions (bsc#1238037).
• CVE-2022-49111: Bluetooth: Fix use after free in hci_send_acl (bsc#1237984).
• CVE-2022-49118: scsi: hisi_sas: Free irq vectors in order for v3 HW (bsc#1237979).
• CVE-2022-49121: scsi: pm8001: Fix tag leaks on error (bsc#1237926).
• CVE-2022-49137: drm/amd/amdgpu/amdgpu_cs: fix refcount leak of a dma_fence obj (bsc#1238155).
• CVE-2022-49175: PM: core: keep irq flags in device_pm_check_callbacks() (bsc#1238099).
• CVE-2022-49176: bfq: fix use-after-free in bfq_dispatch_request (bsc#1238097).
• CVE-2022-49179: block, bfq: do not move oom_bfqq (bsc#1238092).
• CVE-2022-49188: remoteproc: qcom_q6v5_mss: Fix some leaks in q6v5_alloc_memory_region (bsc#1238138).
• CVE-2022-49197: af_netlink: Fix shift out of bounds in group mask calculation (bsc#1238455).
• CVE-2022-49205: bpf, sockmap: Fix double uncharge the mem of sk_msg (bsc#1238335).
• CVE-2022-49232: drm/amd/display: Fix a NULL pointer dereference in amdgpu_dm_connector_add_common_modes() (bsc#1238139).
• CVE-2022-49290: mac80211: fix potential double free on mesh join (bsc#1238156).
• CVE-2022-49305: drivers: staging: rtl8192u: Fix deadlock in ieee80211_beacons_stop() (bsc#1238645).
• CVE-2022-49325: tcp: add accessors to read/set tp->snd_cwnd (bsc#1238398).
• CVE-2022-49335: drm/amdgpu/cs: make commands with 0 chunks illegal behaviour (bsc#1238377).
• CVE-2022-49351: net: altera: Fix refcount leak in altera_tse_mdio_create (bsc#1237939).
• CVE-2022-49385: driver: base: fix UAF when driver_attach failed (bsc#1237951).
• CVE-2022-49390: macsec: fix UAF bug for real_dev (bsc#1238233).
• CVE-2022-49411: bfq: Make sure bfqg for which we are queueing requests is online (bsc#1238307).
• CVE-2022-49442: drivers/base/node.c: fix compaction sysfs file leak (bsc#1238243).
• CVE-2022-49465: blk-throttle: Set BIO_THROTTLED when bio has been throttled (bsc#1238919).
• CVE-2022-49478: media: pvrusb2: fix array-index-out-of-bounds in pvr2_i2c_core_init (bsc#1238000).
• CVE-2022-49489: drm/msm/disp/dpu1: set vbif hw config to NULL to avoid use after memory free during pm runtime resume (bsc#1238244).
• CVE-2022-49504: scsi: lpfc: Inhibit aborts if external loopback plug is inserted (bsc#1238835).
• CVE-2022-49521: scsi: lpfc: Fix resource leak in lpfc_sli4_send_seq_to_ulp() (bsc#1238938).
• CVE-2022-49525: media: cx25821: Fix the warning when removing the module (bsc#1238022).
• CVE-2022-49534: scsi: lpfc: Protect memory leak for NPIV ports sending PLOGI_RJT (bsc#1238893).
• CVE-2022-49535: scsi: lpfc: Fix null pointer dereference after failing to issue FLOGI and PLOGI (bsc#1238937).
• CVE-2022-49536: scsi: lpfc: Fix SCSI I/O completion and abort handler deadlock (bsc#1238838).
• CVE-2022-49537: scsi: lpfc: Fix call trace observed during I/O with CMF enabled (bsc#1238930).
• CVE-2022-49542: scsi: lpfc: Move cfg_log_verbose check before calling lpfc_dmp_dbg() (bsc#1238722).
• CVE-2022-49561: netfilter: conntrack: re-fetch conntrack after insertion (bsc#1238537).
• CVE-2022-49590: igmp: Fix data-races around sysctl_igmp_llm_reports (bsc#1238844).
• CVE-2022-49658: bpf, selftests: Add verifier test case for imm=0,umin=0,umax=1 scalar (bsc#1238803).
• CVE-2022-49668: PM / devfreq: exynos-ppmu: Fix refcount leak in of_get_devfreq_events (bsc#1237957).
• CVE-2022-49693: drm/msm/mdp4: Fix refcount leak in mdp4_modeset_init_intf (bsc#1237954).
• CVE-2022-49725: i40e: Fix call trace in setup_tx_descriptors…

The SUSE Linux Enterprise 11 SP4 kernel was updated to receive various security bugfixes.

The following security bugs were fixed:

• CVE-2022-50200: selinux: Add boundary check in put_entry() (bsc#1245149).