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Kernel Live Patch Security Notice LSN-0039-1
Posted May 28, 2018
Authored by Benjamin M. Romer

Alexei Starovoitov discovered that the Berkeley Packet Filter (BPF) implementation in the Linux kernel contained a branch-pruning logic issue around unreachable code. A local attacker could use this to cause a denial of service. The ext4_iget function in fs/ext4/inode.c in the Linux kernel through 4.15.15 mishandles the case of a root directory with a zero i_links_count, which allows attackers to cause a denial of service (ext4_process_freed_data NULL pointer dereference and OOPS) via a crafted ext4 image. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local, root
systems | linux
advisories | CVE-2017-17862, CVE-2018-1000004, CVE-2018-1092, CVE-2018-1093, CVE-2018-8087
SHA-256 | 0e3788ff5b92bdb81c16b39e96e620f55d7e00317265a10546173540afa06d71

Related Files

Kernel Live Patch Security Notice LSN-0087-1
Posted Jun 20, 2022
Authored by Benjamin M. Romer

Aaron Adams discovered that the netfilter subsystem in the Linux kernel did not properly handle the removal of stateful expressions 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 execute arbitrary code. Ziming Zhang discovered that the netfilter subsystem in the Linux kernel did not properly validate sets with multiple ranged fields. A local attacker could use this to cause a denial of service or execute arbitrary code.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux
advisories | CVE-2022-1966, CVE-2022-1972
SHA-256 | da3d1ebf8a062796a4bf895e4a7b5810ebe229e969e2a6e2a191ecc53f90dbfe
Kernel Live Patch Security Notice LSN-0086-1
Posted Jun 3, 2022
Authored by Benjamin M. Romer

It was discovered that a race condition existed in the network scheduling subsystem of the Linux kernel, 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. Yiqi Sun and Kevin Wang discovered that the cgroups implementation in the Linux kernel did not properly restrict access to the cgroups v1 release_agent feature. A local attacker could use this to gain administrative privileges. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux
advisories | CVE-2021-39713, CVE-2022-0492, CVE-2022-1055, CVE-2022-1116, CVE-2022-21499, CVE-2022-29581, CVE-2022-30594
SHA-256 | d764344ffd074691e5125e0c7ecb9972329d587b004cdad9acfe1fafabfb0253
Kernel Live Patch Security Notice LSN-0085-1
Posted Mar 24, 2022
Authored by Benjamin M. Romer

Yiqi Sun and Kevin Wang discovered that the cgroups implementation in the Linux kernel did not properly restrict access to the cgroups v1 release_agent feature. A local attacker could use this to gain administrative privileges. Nick Gregory discovered that the Linux kernel incorrectly handled network offload functionality. A local attacker could use this to cause a denial of service or possibly execute arbitrary code.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux
advisories | CVE-2022-0492, CVE-2022-25636
SHA-256 | 2192c199581e31d17ad1f82ccb72319fb36da887cc27a4431990dced1f3967d7
Kernel Live Patch Security Notice LSN-0084-1
Posted Jan 20, 2022
Authored by Benjamin M. Romer

William Liu and Jamie Hill-Daniel discovered that the file system context functionality in the Linux kernel contained an integer underflow vulnerability, leading to an out-of-bounds write. A local attacker could use this to cause a denial of service (system crash) or execute arbitrary code.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux
advisories | CVE-2022-0185
SHA-256 | ebdd28169715872d3dae12d04faac30cc03a75e8432f2814b583409805684cf6
Kernel Live Patch Security Notice LSN-0083-1
Posted Jan 6, 2022
Authored by Benjamin M. Romer

The BPF subsystem in the Linux kernel before 4.17 mishandles situations with a long jump over an instruction sequence where inner instructions require substantial expansions into multiple BPF instructions, leading to an overflow. This affects kernel/bpf/core.c and net/core/filter.c. Maxim Levitsky discovered that the KVM hypervisor implementation for AMD processors in the Linux kernel did not properly prevent a guest VM from enabling AVIC in nested guest VMs. An attacker in a guest VM could use this to write to portions of the host’s physical memory. Other vulnerabilities have also been addressed.

tags | advisory, overflow, kernel, vulnerability
systems | linux
advisories | CVE-2018-25020, CVE-2021-22555, CVE-2021-33909, CVE-2021-3653, CVE-2021-4002
SHA-256 | ddd1e7fc677c2b02d3351058bf31466aa231865f93abfb9cdfa1d1ca55622f8d
Kernel Live Patch Security Notice LSN-0082-1
Posted Nov 12, 2021
Authored by Benjamin M. Romer

Jann Horn discovered that the tty subsystem of the Linux kernel did not use consistent locking in some situations, leading to a read-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly expose sensitive information (kernel memory). De4dCr0w of 360 Alpha Lab discovered that the BPF verifier in the Linux kernel did not properly handle mod32 destination register truncation when the source register was known to be 0. A local attacker could use this to expose sensitive information (kernel memory) or possibly execute arbitrary code. Various other vulnerabilities were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local, vulnerability
systems | linux
advisories | CVE-2020-29660, CVE-2020-29661, CVE-2021-3444, CVE-2021-3715
SHA-256 | 4c43b77dc14ec38d515895508c90603e29e4435a67390143e2cb91e68bc70e9d
Kernel Live Patch Security Notice LSN-0081-1
Posted Sep 14, 2021
Authored by Benjamin M. Romer

Maxim Levitsky discovered that the KVM hypervisor implementation for AMD processors in the Linux kernel did not properly prevent a guest VM from enabling AVIC in nested guest VMs. An attacker in a guest VM could use this to write to portions of the host’s physical memory. Maxim Levitsky and Paolo Bonzini discovered that the KVM hypervisor implementation for AMD processors in the Linux kernel allowed a guest VM to disable restrictions on VMLOAD/VMSAVE in a nested guest. An attacker in a guest VM could use this to read or write portions of the host's physical memory. Various other vulnerabilities were also addressed.

tags | advisory, kernel, vulnerability
systems | linux
advisories | CVE-2021-22555, CVE-2021-33909, CVE-2021-3653, CVE-2021-3656
SHA-256 | 051e461652f3d7e1d5f1bd5ab2e8d9f2f9a398877fa90de84818f4955d1a2074
Kernel Live Patch Security Notice LSN-0080-1
Posted Aug 18, 2021
Authored by Benjamin M. Romer

Andy Nguyen discovered that the netfilter subsystem in the Linux kernel contained an out-of-bounds write in its setsockopt() implementation. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux
advisories | CVE-2021-22555
SHA-256 | 4af31b963bddcf331a7037ea35c40e4fbfd445f815d8756856219abad1f16c71
Kernel Live Patch Security Notice LSN-0079-1
Posted Jul 26, 2021
Authored by Benjamin M. Romer

It was discovered that the eBPF implementation in the Linux kernel did not properly track bounds information for 32 bit registers when performing div and mod operations. A local attacker could use this to possibly execute arbitrary code. It was discovered that the virtual file system implementation in the Linux kernel contained an unsigned to signed integer conversion error. A local attacker could use this to cause a denial of service (system crash) or execute arbitrary code.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux
advisories | CVE-2021-33909, CVE-2021-3600
SHA-256 | 85ecff3443cabbbdfd95e276021ce53f9ded3558dc511597031bf1014cb24140
Kernel Live Patch Security Notice LSN-0078-1
Posted Jul 20, 2021
Authored by Benjamin M. Romer

Norbert Slusarek discovered a race condition in the CAN BCM networking protocol of the Linux kernel leading to multiple use-after-free vulnerabilities. A local attacker could use this issue to execute arbitrary code.

tags | advisory, arbitrary, kernel, local, vulnerability, protocol
systems | linux
advisories | CVE-2021-3609
SHA-256 | e5626ea542e0e7cf4d21b7704ad137ab9dac2e0503a662b96c9d976e9d97f88c
Kernel Live Patch Security Notice LSN-0077-1
Posted May 18, 2021
Authored by Benjamin M. Romer

Vincent Dehors discovered that the shiftfs file system in the Ubuntu Linux kernel did not properly handle faults in copy_from_user() when passing through ioctls to an underlying file system. A local attacker could use this to cause a denial of service (memory exhaustion) or execute arbitrary code.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2021-3492
SHA-256 | bdea505eb4fcf592e368d096a5525e292ae2730578fbf547edea57ce828b48fd
Kernel Live Patch Security Notice LSN-0076-1
Posted May 3, 2021
Authored by Benjamin M. Romer

It was discovered that the overlayfs implementation in the Linux kernel did not properly validate the application of file system capabilities with respect to user namespaces. A local attacker could use this to gain elevated privileges. Piotr Krysiuk discovered that the BPF JIT compiler for x86 in the Linux kernel did not properly validate computation of branch displacements in some situations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.

tags | advisory, denial of service, arbitrary, x86, kernel, local
systems | linux
advisories | CVE-2021-29154, CVE-2021-3493
SHA-256 | 2804a214253fb2c002641f38c8aae9e4023d617f9897b0c5c01ff06e5794df2b
Kernel Live Patch Security Notice LSN-0075-1
Posted Apr 7, 2021
Authored by Benjamin M. Romer

Piotr Krysiuk discovered that the BPF subsystem in the Linux kernel did not properly apply speculative execution limits on some pointer types. A local attacker could use this to expose sensitive information (kernel memory). It was discovered that the memory management subsystem in the Linux kernel did not properly handle copy-on-write operations in some situations. A local attacker could possibly use this to gain unintended write access to read-only memory pages. Various other issues were also addressed.

tags | advisory, kernel, local
systems | linux
advisories | CVE-2020-27170, CVE-2020-27171, CVE-2020-29372, CVE-2020-29374, CVE-2021-27363, CVE-2021-27364, CVE-2021-27365, CVE-2021-3444
SHA-256 | 469cc31bae7443b09e56a62b4aac4c6a731592910bda9c7097efee0cfc5ebb11
Kernel Live Patch Security Notice LSN-0074-1
Posted Feb 1, 2021
Authored by Benjamin M. Romer

Elena Petrova discovered that the pin controller device tree implementation in the Linux kernel did not properly handle string references. A local attacker could use this to expose sensitive information (kernel memory). Andy Nguyen discovered that the Bluetooth A2MP implementation in the Linux kernel did not properly initialize memory in some situations. A physically proximate remote attacker could use this to expose sensitive information (kernel memory). Various other issues were also addressed.

tags | advisory, remote, kernel, local
systems | linux
advisories | CVE-2020-0427, CVE-2020-12352, CVE-2020-25645, CVE-2020-28374
SHA-256 | 682e52dd49535c7ff7a41efaf9cdf2164f511e0432317c6e2e9cafb8c2198527
Kernel Live Patch Security Notice LSN-0073-1
Posted Oct 26, 2020
Authored by Benjamin M. Romer

Andy Nguyen discovered that the Bluetooth L2CAP implementation in the Linux kernel contained a type-confusion error. Andy Nguyen discovered that the Bluetooth A2MP implementation in the Linux kernel did not properly initialize memory in some situations. Andy Nguyen discovered that the Bluetooth HCI event packet parser in the Linux kernel did not properly handle event advertisements of certain sizes, leading to a heap-based buffer overflow.

tags | advisory, overflow, kernel
systems | linux
advisories | CVE-2020-12351, CVE-2020-12352, CVE-2020-24490
SHA-256 | 512630109fdf9fe767bed1b49eba7332dc002fa3cdd83221748674a578aae27a
Kernel Live Patch Security Notice LSN-0072-1
Posted Oct 14, 2020
Authored by Benjamin M. Romer

It was discovered that the F2FS file system implementation in the Linux kernel did not properly perform bounds checking on xattrs in some situations. A local attacker could possibly use this to expose sensitive information (kernel memory). It was discovered that the Serial CAN interface driver in the Linux kernel did not properly initialize data. A local attacker could use this to expose sensitive information (kernel memory). Other issues where also addressed.

tags | advisory, kernel, local
systems | linux
advisories | CVE-2020-0067, CVE-2020-11494, CVE-2020-11935, CVE-2020-12114, CVE-2020-14386, CVE-2020-16119, CVE-2020-16120
SHA-256 | 93076523b60699a74659d86a99aa5642c64e2657baecd1f27345aa8fc2cd2b97
Kernel Live Patch Security Notice LSN-0071-1
Posted Sep 10, 2020
Authored by Benjamin M. Romer

A security issue was fixed in the 4.15 kernel. This issue affects the 5.4 kernel as well, but a livepatch is not yet available. While work is continuing to develop livepatches for all affected kernels, due to the severity of the issue, they are releasing patches as they become ready. Or Cohen discovered that the AF_PACKET implementation in the Linux kernel did not properly perform bounds checking in some situations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux
advisories | CVE-2020-14386
SHA-256 | a13ec104389455bc48ad854bb63cf714af2cc7fd1932c7dc38c32db57bf0e5c6
Kernel Live Patch Security Notice LSN-0065-1
Posted Apr 15, 2020
Authored by Benjamin M. Romer

Andrew Honig reported a flaw in the way KVM (Kernel-based Virtual Machine) emulated the IOAPIC. A privileged guest user could exploit this flaw to read host memory or cause a denial of service (crash the host). It was discovered that the KVM implementation in the Linux kernel, when paravirtual TLB flushes are enabled in guests, the hypervisor in some situations could miss deferred TLB flushes or otherwise mishandle them. An attacker in a guest VM could use this to expose sensitive information (read memory from another guest VM). Al Viro discovered that the vfs layer 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).

tags | advisory, denial of service, kernel, local
systems | linux
advisories | CVE-2013-1798, CVE-2019-3016, CVE-2020-8428
SHA-256 | ca957b71b70ae09e8f907fcd801c5a9571b9a877407f563e8bd4dc3a7e21def9
Kernel Live Patch Security Notice LSN-0064-1
Posted Mar 19, 2020
Authored by Benjamin M. Romer

Paulo Bonzini discovered that the KVM hypervisor implementation in the Linux kernel could improperly let a nested (level 2) guest access the resources of a parent (level 1) guest in certain situations. An attacker could use this to expose sensitive information.

tags | advisory, kernel
systems | linux
advisories | CVE-2020-2732
SHA-256 | 013a0dfba70302c800eab63aa571da076d3bc4a87d14b9f7b138548d27333d78
Kernel Live Patch Security Notice LSN-0063-1
Posted Feb 20, 2020
Authored by Benjamin M. Romer

Mitchell Frank discovered that the Wi-Fi implementation in the Linux kernel when used as an access point would send IAPP location updates for stations before client authentication had completed. A physically proximate attacker could use this to cause a denial of service. It was discovered that the Linux kernel did not properly clear data structures on context switches for certain Intel graphics processors. A local attacker could use this to expose sensitive information. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux
advisories | CVE-2019-14615, CVE-2019-19050, CVE-2019-20096, CVE-2019-5108, CVE-2020-7053
SHA-256 | 3c905722a86d530e482e9a6b3bcee6079ea4d1a13dff3d803fadfd5fb541bc01
Kernel Live Patch Security Notice LSN-0062-1
Posted Feb 3, 2020
Authored by Benjamin M. Romer

It was discovered that the binder IPC implementation in the Linux kernel did not properly perform bounds checking in some situations, leading to an out-of-bounds write. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. It was discovered that the Linux kernel did not properly clear data structures on context switches for certain Intel graphics processors. A local attacker could use this to expose sensitive information. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux
advisories | CVE-2019-14615, CVE-2019-14895, CVE-2019-14896, CVE-2019-14897, CVE-2019-14901, CVE-2019-18885, CVE-2019-2214
SHA-256 | dd9eb8a13d06fc9ad56d7a4bb1f0a271663ad5edcf7bf6387c09481d3c8486e9
Kernel Live Patch Security Notice LSN-0061-1
Posted Jan 8, 2020
Authored by Benjamin M. Romer

It was discovered that a heap-based buffer overflow existed in the Marvell WiFi-Ex Driver for the Linux kernel. A physically proximate attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. It was discovered that a heap-based buffer overflow existed in the Marvell Libertas WLAN Driver for the Linux kernel. A physically proximate attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, overflow, arbitrary, kernel
systems | linux
advisories | CVE-2019-14895, CVE-2019-14896, CVE-2019-14897, CVE-2019-14901, CVE-2019-15794
SHA-256 | 7a78ab2637b0c415c10d8aece2f49d7cb0ffca96812fc550881491945ac50eac
Kernel Live Patch Security Notice LSN-0059-1
Posted Nov 13, 2019
Authored by Benjamin M. Romer

On November 12, fixes for several high-severity Intel processor CVEs were released into the Ubuntu kernel, accompanied by a related processor microcode update. Due to the high complexity of the fixes and the required microcode update, we are unable to livepatch this set of CVEs. Please plan to reboot into an updated kernel as soon as possible. Various other issues were also addressed.

tags | advisory, kernel
systems | linux, ubuntu
advisories | CVE-2018-12207, CVE-2019-0154, CVE-2019-0155, CVE-2019-11135
SHA-256 | fff054687351f5cc49fca94a5fcdb39159f4d22bc5f7c2a6ae86bde91ebf2607
Kernel Live Patch Security Notice LSN-0058-1
Posted Oct 23, 2019
Authored by Benjamin M. Romer

It was discovered that a race condition existed in the GFS2 file system in the Linux kernel. A local attacker could possibly use this to cause a denial of service (system crash). It was discovered that a use-after-free error existed in the block layer subsystem of the Linux kernel when certain failure conditions occurred. A local attacker could possibly use this to cause a denial of service (system crash) or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux
advisories | CVE-2016-10905, CVE-2018-20856, CVE-2018-20961, CVE-2018-20976, CVE-2018-21008, CVE-2019-0136, CVE-2019-10126, CVE-2019-10207, CVE-2019-11477, CVE-2019-11478, CVE-2019-11833, CVE-2019-12614, CVE-2019-14283, CVE-2019-14284, CVE-2019-14814, CVE-2019-14815, CVE-2019-14816, CVE-2019-14821, CVE-2019-14835, CVE-2019-2054, CVE-2019-2181, CVE-2019-3846
SHA-256 | 5442de6a129171e9103a7acd9d861ab0fda6074505e32a4ad08db9df45b30c61
Kernel Live Patch Security Notice LSN-0056-1
Posted Sep 23, 2019
Authored by Benjamin M. Romer

Peter Pi discovered a buffer overflow in the virtio network backend (vhost_net) implementation in the Linux kernel. An attacker in a guest may be able to use this to cause a denial of service (host OS crash) or possibly execute arbitrary code in the host OS.

tags | advisory, denial of service, overflow, arbitrary, kernel
systems | linux
advisories | CVE-2019-14835
SHA-256 | 2ae10bdb1c9632e027b75b76ad2d6e3b299967f41342245c237b87d05be2b799
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