CVE-2015-4692

This kernel update provides an upgrade to the upstream 4.1 longterm kernel series, currently based on 4.1.8 and resolves at least the following security issues:

It was found that the Linux kernel's keyring implementation would leak memory when adding a key to a keyring via the add_key() function. A local attacker could use this flaw to exhaust all available memory on the system. (CVE-2015-1333)

A flaw was found in the Linux kernel where the deletion of a file or directory could trigger an unmount and reveal data under a mount point. This flaw was inadvertently introduced with the new feature of being able to lazily unmount a mount tree when using file system user namespaces. (CVE-2015-4176)

A flaw was discovered in the kernel's collect_mounts function. If the kernel audit subsystem called collect_mounts to audit an unmounted path, it could panic the system. With this flaw, an unprivileged user could call umount (MNT_DETACH) to launch a denial-of-service attack. (CVE-2015-4177)

A flaw was found in the Linux kernel which is related to the user namespace lazily unmounting file systems. The fs_pin struct has two members (m_list and s_list) which are usually initialized on use in the pin_insert_group function. However, these members might go unmodified; in this case, the system panics when it attempts to destroy or free them. This flaw could be used to launch a denial-of-service attack. (CVE-2015-4178)

A DoS flaw was found for a Linux kernel built for the x86 architecture which had the KVM virtualization support(CONFIG_KVM) enabled. The kernel would be vulnerable to a NULL pointer dereference flaw in Linux kernel's kvm_apic_has_events() function while doing an ioctl. An unprivileged user able to access the "/dev/kvm" device could use this flaw to crash the system kernel. (CVE-2015-4692)

A flaw was found in the kernel's implementation of the Berkeley Packet Filter (BPF). A local attacker could craft BPF code to crash the system by creating a situation in which the JIT compiler would fail to correctly optimize the JIT image on the last pass. This would lead to the CPU executing instructions that were not part of the JIT code. (CVE-2015-4700)

The get_bitmap_file function in drivers/md/md.c in the Linux kernel before 4.1.6 does not initialize a certain bitmap data structure, which allows local users to obtain sensitive information from kernel memory via a GET_BITMAP_FILE ioctl call. (CVE-2015-5697)

Use-after-free vulnerability in the path_openat function in fs/namei.c in the Linux kernel 3.x and 4.x before 4.0.4 allows local users to cause a denial of service or possibly have unspecified other impact via O_TMPFILE filesystem operations that leverage a duplicate cleanup operation. (CVE-2015-5706)

It was discovered that an integer overflow error existed in the SCSIgeneric (sg) driver in the Linux kernel. A local attacker with writepermission to a SCSI generic device could use this to cause a denial of service (system crash) or potentially escalate their privileges. (CVE-2015-5707)

Additionally the following packages have been updated to add or improve support for the 4.1 series kernels: btrfs-progs, iproute2, xtables-addons, nvidia304, nvidia340, kernel-firmware-nonfree, radeon-firmware.

For other changes, see the referenced changelogs:

This kernel-linus update provides an upgrade to the upstream 4.1 longterm kernel series, currently based on 4.1.8 and resolves at least the following security issues:

It was found that the Linux kernel's keyring implementation would leak memory when adding a key to a keyring via the add_key() function. A local attacker could use this flaw to exhaust all available memory on the system. (CVE-2015-1333)

A flaw was found in the Linux kernel where the deletion of a file or directory could trigger an unmount and reveal data under a mount point. This flaw was inadvertently introduced with the new feature of being able to lazily unmount a mount tree when using file system user namespaces. (CVE-2015-4176)

A flaw was discovered in the kernel's collect_mounts function. If the kernel audit subsystem called collect_mounts to audit an unmounted path, it could panic the system. With this flaw, an unprivileged user could call umount (MNT_DETACH) to launch a denial-of-service attack. (CVE-2015-4177)

A flaw was found in the Linux kernel which is related to the user namespace lazily unmounting file systems. The fs_pin struct has two members (m_list and s_list) which are usually initialized on use in the pin_insert_group function. However, these members might go unmodified; in this case, the system panics when it attempts to destroy or free them. This flaw could be used to launch a denial-of-service attack. (CVE-2015-4178)

A DoS flaw was found for a Linux kernel built for the x86 architecture which had the KVM virtualization support(CONFIG_KVM) enabled. The kernel would be vulnerable to a NULL pointer dereference flaw in Linux kernel's kvm_apic_has_events() function while doing an ioctl. An unprivileged user able to access the "/dev/kvm" device could use this flaw to crash the system kernel. (CVE-2015-4692)

A flaw was found in the kernel's implementation of the Berkeley Packet Filter (BPF). A local attacker could craft BPF code to crash the system by creating a situation in which the JIT compiler would fail to correctly optimize the JIT image on the last pass. This would lead to the CPU executing instructions that were not part of the JIT code. (CVE-2015-4700)

The get_bitmap_file function in drivers/md/md.c in the Linux kernel before 4.1.6 does not initialize a certain bitmap data structure, which allows local users to obtain sensitive information from kernel memory via a GET_BITMAP_FILE ioctl call. (CVE-2015-5697)

Use-after-free vulnerability in the path_openat function in fs/namei.c in the Linux kernel 3.x and 4.x before 4.0.4 allows local users to cause a denial of service or possibly have unspecified other impact via O_TMPFILE filesystem operations that leverage a duplicate cleanup operation. (CVE-2015-5706)

It was discovered that an integer overflow error existed in the SCSIgeneric (sg) driver in the Linux kernel. A local attacker with writepermission to a SCSI generic device could use this to cause a denial of service (system crash) or potentially escalate their privileges. (CVE-2015-5707)

For other changes, see the referenced changelogs:

This kernel-tmb update provides an upgrade to the upstream 4.1 longterm kernel series, currently based on 4.1.15 and resolves at least the following security issues:

It was found that the Linux kernel's keyring implementation would leak memory when adding a key to a keyring via the add_key() function. A local attacker could use this flaw to exhaust all available memory on the system. (CVE-2015-1333)

A flaw was found in the Linux kernel where the deletion of a file or directory could trigger an unmount and reveal data under a mount point. This flaw was inadvertently introduced with the new feature of being able to lazily unmount a mount tree when using file system user namespaces. (CVE-2015-4176)

A flaw was discovered in the kernel's collect_mounts function. If the kernel audit subsystem called collect_mounts to audit an unmounted path, it could panic the system. With this flaw, an unprivileged user could call umount (MNT_DETACH) to launch a denial-of-service attack. (CVE-2015-4177)

A flaw was found in the Linux kernel which is related to the user namespace lazily unmounting file systems. The fs_pin struct has two members (m_list and s_list) which are usually initialized on use in the pin_insert_group function. However, these members might go unmodified; in this case, the system panics when it attempts to destroy or free them. This flaw could be used to launch a denial-of-service attack. (CVE-2015-4178)

A DoS flaw was found for a Linux kernel built for the x86 architecture which had the KVM virtualization support(CONFIG_KVM) enabled. The kernel would be vulnerable to a NULL pointer dereference flaw in Linux kernel's kvm_apic_has_events() function while doing an ioctl. An unprivileged user able to access the "/dev/kvm" device could use this flaw to crash the system kernel. (CVE-2015-4692)

A flaw was found in the kernel's implementation of the Berkeley Packet Filter (BPF). A local attacker could craft BPF code to crash the system by creating a situation in which the JIT compiler would fail to correctly optimize the JIT image on the last pass. This would lead to the CPU executing instructions that were not part of the JIT code. (CVE-2015-4700)

The virtnet_probe function in drivers/net/virtio_net.c in the Linux kernel before 4.2 attempts to support a FRAGLIST feature without proper memory allocation, which allows guest OS users to cause a denial of service (buffer overflow and memory corruption) via a crafted sequence of fragmented packets. (CVE-2015-5156)

Moein Ghasemzadeh discovered that the USB WhiteHEAT serial driver contained hardcoded attributes about the USB devices. An attacker could construct a fake WhiteHEAT USB device that, when inserted, causes a denial of service (system crash) (CVE-2015-5257).

A guest to host DoS issue was found affecting various hypervisors. In that, a guest can DoS the host by triggering an infinite stream of "alignment check" (#AC) exceptions. This causes the microcode to enter an infinite loop where the core never receives another interrupt. The host kernel panics due to this effect (CVE-2015-5307).

The get_bitmap_file function in drivers/md/md.c in the Linux kernel before 4.1.6 does not initialize a certain bitmap data structure, which allows local users to obtain sensitive information from kernel memory via a GET_BITMAP_FILE ioctl call. (CVE-2015-5697)

Use-after-free vulnerability in the path_openat function in fs/namei.c in the Linux kernel 3.x and 4.x before 4.0.4 allows local users to cause a denial of service or possibly have unspecified other impact via O_TMPFILE filesystem operations that leverage a duplicate cleanup operation. (CVE-2015-5706)

It was discovered that an integer overflow error existed in the SCSIgeneric (sg) driver in the Linux kernel. A local attacker with writepermission to a SCSI generic device could use this to cause a denial of service (system crash) or potentially escalate their privileges. (CVE-2015-5707)

The __rds_conn_create function in…

The SUSE Linux Enterprise 12 kernel was updated to 3.12.44 to receive various security and bugfixes.

These features were added:

• mpt2sas: Added Reply Descriptor Post Queue (RDPQ) Array support (bsc#854824).
• mpt3sas: Bump mpt3sas driver version to 04.100.00.00 (bsc#854817).

Following security bugs were fixed:

• CVE-2015-1805: iov overrun for failed atomic copy could have lead to DoS or privilege escalation (bsc#933429).
• CVE-2015-3212: A race condition in the way the Linux kernel handled lists of associations in SCTP sockets could have lead to list corruption and kernel panics (bsc#936502).
• CVE-2015-4036: DoS via memory corruption in vhost/scsi driver (bsc#931988).
• CVE-2015-4167: Linux kernel built with the UDF file system(CONFIG_UDF_FS) support was vulnerable to a crash. It occurred while fetching inode information from a corrupted/malicious udf file system image (bsc#933907).
• CVE-2015-4692: DoS via NULL pointer dereference in kvm_apic_has_events function (bsc#935542).
• CVE-2015-5364: Remote DoS via flood of UDP packets with invalid checksums (bsc#936831).
• CVE-2015-5366: Remote DoS of EPOLLET epoll applications via flood of UDP packets with invalid checksums (bsc#936831).

Security issues already fixed in the previous update but not referenced by CVE:

• CVE-2014-9728: Kernel built with the UDF file system(CONFIG_UDF_FS) support were vulnerable to a crash (bsc#933904).
• CVE-2014-9729: Kernel built with the UDF file system(CONFIG_UDF_FS) support were vulnerable to a crash (bsc#933904).
• CVE-2014-9730: Kernel built with the UDF file system(CONFIG_UDF_FS) support were vulnerable to a crash (bsc#933904).
• CVE-2014-9731: Kernel built with the UDF file system(CONFIG_UDF_FS) support were vulnerable to information leakage (bsc#933896).

The following non-security bugs were fixed:

• ALSA: hda - add codec ID for Skylake display audio codec (bsc#936556).
• ALSA: hda/hdmi - apply Haswell fix-ups to Skylake display codec (bsc#936556).
• ALSA: hda_controller: Separate stream_tag for input and output streams (bsc#936556).
• ALSA: hda_intel: add AZX_DCAPS_I915_POWERWELL for SKL and BSW (bsc#936556).
• ALSA: hda_intel: apply the Seperate stream_tag for Skylake (bsc#936556).
• ALSA: hda_intel: apply the Seperate stream_tag for Sunrise Point (bsc#936556).
• Btrfs: Handle unaligned length in extent_same (bsc#937609).
• Btrfs: add missing inode item update in fallocate() (bsc#938023).
• Btrfs: check pending chunks when shrinking fs to avoid corruption (bsc#936445).
• Btrfs: do not update mtime/ctime on deduped inodes (bsc#937616).
• Btrfs: fix block group ->space_info null pointer dereference (bsc#935088).
• Btrfs: fix clone / extent-same deadlocks (bsc#937612).
• Btrfs: fix deadlock with extent-same and readpage (bsc#937612).
• Btrfs: fix fsync data loss after append write (bsc#936446).
• Btrfs: fix hang during inode eviction due to concurrent readahead (bsc#935085).
• Btrfs: fix memory leak in the extent_same ioctl (bsc#937613).
• Btrfs: fix race when reusing stale extent buffers that leads to BUG_ON (bsc#926369).
• Btrfs: fix use after free when close_ctree frees the orphan_rsv (bsc#938022).
• Btrfs: pass unaligned length to btrfs_cmp_data() (bsc#937609).
• Btrfs: provide super_operations->inode_get_dev (bsc#927455).
• Drivers: hv: balloon: check if ha_region_mutex was acquired in MEM_CANCEL_ONLINE case.
• Drivers: hv: fcopy: process deferred messages when we complete the transaction.
• Drivers: hv: fcopy: rename fcopy_work -> fcopy_timeout_work.
• Drivers: hv: fcopy: set .owner reference for file operations.
• Drivers: hv: fcopy: switch to using the hvutil_device_state state machine.
• Drivers: hv: hv_balloon: correctly handle num_pages>INT_MAX case.
• Drivers: hv: hv_balloon: correctly handle val.freeram lower than num_pages case.
• Drivers: hv: hv_balloon: do not lose memory when onlining order is not natural.
• Drivers: hv: hv_balloon: do not online pages in offline…

The kvm_apic_has_events function in arch/x86/kvm/lapic.h in the Linux kernel through 4.1.3 allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact by leveraging /dev/kvm access for an ioctl call.

A flaw was discovered in the user space memory copying for the pipe iovecs in the Linux kernel. An unprivileged local user could exploit this flaw to cause a denial of service (system crash) or potentially escalate their privileges. (CVE-2015-1805)

A flaw was discovered in the kvm (kernel virtual machine) subsystem's kvm_apic_has_events function. A unprivileged local user could exploit this flaw to cause a denial of service (system crash). (CVE-2015-4692)

Daniel Borkmann reported a kernel crash in the Linux kernel's BPF filter JIT optimization. A local attacker could exploit this flaw to cause a denial of service (system crash). (CVE-2015-4700)

A flaw was discovered in how the Linux kernel handles invalid UDP checksums. A remote attacker could exploit this flaw to cause a denial of service using a flood of UDP packets with invalid checksums. (CVE-2015-5364)

A flaw was discovered in how the Linux kernel handles invalid UDP checksums. A remote attacker can cause a denial of service against applications that use epoll by injecting a single packet with an invalid checksum. (CVE-2015-5366)

A double free flaw was discovered in the Linux kernel's path lookup. A local user could cause a denial of service (Oops). (CVE-2015-5706)

A flaw was discovered in the kvm (kernel virtual machine) subsystem's kvm_apic_has_events function. A unprivileged local user could exploit this flaw to cause a denial of service (system crash). (CVE-2015-4692)

A flaw was discovered in how the Linux kernel handles invalid UDP checksums. A remote attacker could exploit this flaw to cause a denial of service using a flood of UDP packets with invalid checksums. (CVE-2015-5364)

A flaw was discovered in how the Linux kernel handles invalid UDP checksums. A remote attacker can cause a denial of service against applications that use epoll by injecting a single packet with an invalid checksum. (CVE-2015-5366)

A flaw was discovered in the kvm (kernel virtual machine) subsystem's kvm_apic_has_events function. A unprivileged local user could exploit this flaw to cause a denial of service (system crash). (CVE-2015-4692)

Daniel Borkmann reported a kernel crash in the Linux kernel's BPF filter JIT optimization. A local attacker could exploit this flaw to cause a denial of service (system crash). (CVE-2015-4700)

A flaw was discovered in how the Linux kernel handles invalid UDP checksums. A remote attacker could exploit this flaw to cause a denial of service using a flood of UDP packets with invalid checksums. (CVE-2015-5364)

A flaw was discovered in how the Linux kernel handles invalid UDP checksums. A remote attacker can cause a denial of service against applications that use epoll by injecting a single packet with an invalid checksum. (CVE-2015-5366)