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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

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Kernel Live Patch Security Notice LSN-0090-1
Posted Nov 21, 2022
Authored by Benjamin M. Romer

David Bouman discovered that the netfilter subsystem in the Linux kernel did not properly validate passed user register indices. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. David Bouman and Billy Jheng Bing Jhong discovered that a race condition existed in the io_uring subsystem in 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. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux
advisories | CVE-2022-1015, CVE-2022-2602, CVE-2022-41674, CVE-2022-42720, CVE-2022-42721, CVE-2022-42722
SHA-256 | c8b54fe7071577436d5dc780fd7a8a538a0ac9493dd4e3362ddd475aa5896c8c
Kernel Live Patch Security Notice LSN-0089-1
Posted Aug 30, 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. Ziming Zhang discovered that the netfilter subsystem in the Linux kernel did not properly validate sets with multiple ranged fields. It was discovered that the implementation of POSIX timers in the Linux kernel did not properly clean up timers in some situations. Various other vulnerabilities were also discovered.

tags | advisory, kernel, vulnerability
systems | linux, osx
advisories | CVE-2022-1966, CVE-2022-1972, CVE-2022-21499, CVE-2022-2585, CVE-2022-2586, CVE-2022-2588, CVE-2022-29581, CVE-2022-34918
SHA-256 | 05867268c3cb4a38f1e83386efef57668577cf6a6daf5f223e85f17b2010f8e2
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
Ubuntu Security Notice USN-5073-2
Posted Sep 17, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5073-2 - 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. 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. Various other issues were also addressed.

tags | advisory, kernel
systems | linux, ubuntu
advisories | CVE-2021-34693, CVE-2021-3612, CVE-2021-3653, CVE-2021-3656, CVE-2021-38160
SHA-256 | 73db5d8411c29b8d786d41416069b7ec21b2ce13e2e482965f04c46f510de2e2
Ubuntu Security Notice USN-5071-2
Posted Sep 17, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5071-2 - USN-5071-1 fixed vulnerabilities in the Linux kernel for Ubuntu 20.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 20.04 LTS for Ubuntu 18.04 LTS. 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 issues were also addressed.

tags | advisory, kernel, vulnerability
systems | linux, ubuntu
advisories | CVE-2020-36311, CVE-2021-22543, CVE-2021-3612, CVE-2021-3653, CVE-2021-3656
SHA-256 | 08286776d53ae93088aee6f142faa0c27c8411ae4ab3530488089971ed861760
Ubuntu Security Notice USN-5082-1
Posted Sep 17, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5082-1 - 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. 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. Various other issues were also addressed.

tags | advisory, kernel
systems | linux, ubuntu
advisories | CVE-2021-3609, CVE-2021-3653, CVE-2021-3656
SHA-256 | 1691e96b342a299e6c7efc1bf7e7d50d0589e4769c49bd5e499e3b03e5e044c7
Ubuntu Security Notice USN-5073-1
Posted Sep 11, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5073-1 - 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. 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. Various other issues were also addressed.

tags | advisory, kernel
systems | linux, ubuntu
advisories | CVE-2021-34693, CVE-2021-3612, CVE-2021-3653, CVE-2021-3656, CVE-2021-38160
SHA-256 | d47f70ebd1eef93cc6bda3c8c110382f63a6d1079b05d6e7253e584a3a764072
Ubuntu Security Notice USN-5070-1
Posted Sep 9, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5070-1 - 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. 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. Various other issues were also addressed.

tags | advisory, kernel
systems | linux, ubuntu
advisories | CVE-2020-26541, CVE-2021-22543, CVE-2021-34693, CVE-2021-3612, CVE-2021-3653, CVE-2021-3656, CVE-2021-38198, CVE-2021-38200, CVE-2021-38206, CVE-2021-38207
SHA-256 | a3a2b8603d4257f8b0d4a21be470c82fa48b4774dc9e390edb98c4d8a1ce252a
Ubuntu Security Notice USN-5072-1
Posted Sep 9, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5072-1 - 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. 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. Various other issues were also addressed.

tags | advisory, kernel
systems | linux, ubuntu
advisories | CVE-2021-3653, CVE-2021-3656
SHA-256 | be41c57c01ed9fa4599399db95720e59ea37523dd5a98443a2c242eabb13f86e
Ubuntu Security Notice USN-5071-1
Posted Sep 9, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5071-1 - 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. 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. Various other issues were also addressed.

tags | advisory, kernel
systems | linux, ubuntu
advisories | CVE-2020-36311, CVE-2021-22543, CVE-2021-3612, CVE-2021-3653, CVE-2021-3656
SHA-256 | 7801f4ce6a4419b3f2f1341fe4341924324976da2dd67f2e555b930b05113149
Ubuntu Security Notice USN-5062-1
Posted Sep 8, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5062-1 - 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.

tags | advisory, kernel
systems | linux, ubuntu
advisories | CVE-2021-3653
SHA-256 | 695fad95e14c4fb2603f02416a8dedd1a00f350821a27e281dab93d00d4e7ed3
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
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