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CVE-2020-12771

Status Candidate

Overview

An issue was discovered in the Linux kernel through 5.6.11. btree_gc_coalesce in drivers/md/bcache/btree.c has a deadlock if a coalescing operation fails.

Related Files

Ubuntu Security Notice USN-4485-1
Posted Sep 2, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4485-1 - Timothy Michaud discovered that the i915 graphics driver in the Linux kernel did not properly validate user memory locations for the i915_gem_execbuffer2_ioctl. A local attacker could possibly use this to cause a denial of service or execute arbitrary code. It was discovered that the Kvaser CAN/USB driver in the Linux kernel did not properly initialize memory in certain situations. A local attacker could possibly use this to expose sensitive information. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2018-20669, CVE-2019-19947, CVE-2019-20810, CVE-2020-10732, CVE-2020-10766, CVE-2020-10767, CVE-2020-10768, CVE-2020-10781, CVE-2020-12655, CVE-2020-12656, CVE-2020-12771, CVE-2020-13974, CVE-2020-15393, CVE-2020-24394
SHA-256 | a61831f926ce25ea97d8bd2b2fe2ff6627483599c3f1ee6249023bd9550e4f67
Ubuntu Security Notice USN-4483-1
Posted Sep 2, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4483-1 - Chuhong Yuan discovered that go7007 USB audio device driver in the Linux kernel did not properly deallocate memory in some failure conditions. A physically proximate attacker could use this to cause a denial of service. Fan Yang discovered that the mremap implementation in the Linux kernel did not properly handle DAX Huge Pages. A local attacker with access to DAX storage could use this to gain administrative privileges. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2019-20810, CVE-2020-10757, CVE-2020-10766, CVE-2020-10767, CVE-2020-10768, CVE-2020-10781, CVE-2020-12655, CVE-2020-12656, CVE-2020-12771, CVE-2020-13974, CVE-2020-14356, CVE-2020-15393, CVE-2020-24394
SHA-256 | f3d7b343dd037f207841d31eaef395a9ef8aa891f0b3d52ff6fe53d20c95c23f
Ubuntu Security Notice USN-4465-1
Posted Aug 19, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4465-1 - It was discovered that the XFS file system implementation in the Linux kernel did not properly validate meta data in some circumstances. An attacker could use this to construct a malicious XFS image that, when mounted, could cause a denial of service. It was discovered that the bcache subsystem in the Linux kernel did not properly release a lock in some error conditions. A local attacker could possibly use this to cause a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2020-12655, CVE-2020-12771, CVE-2020-15393
SHA-256 | d61918c79cfb7d2a7c42dc5a881a9fdf1bf9ceb9e554b0b44c7668274b983ab2
Ubuntu Security Notice USN-4463-1
Posted Aug 18, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4463-1 - It was discovered that the bcache subsystem in the Linux kernel did not properly release a lock in some error conditions. A local attacker could possibly use this to cause a denial of service. Kyungtae Kim discovered that the USB testing driver in the Linux kernel did not properly deallocate memory on disconnect events. A physically proximate attacker could use this to cause a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2020-12771, CVE-2020-15393
SHA-256 | 9bae40e89e07da10d54b7fabc2d9a2f10be261c5b51e7f931b3529f60b4ed56e
Ubuntu Security Notice USN-4462-1
Posted Aug 18, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4462-1 - It was discovered that the bcache subsystem in the Linux kernel did not properly release a lock in some error conditions. A local attacker could possibly use this to cause a denial of service.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2020-12771
SHA-256 | fb0e88bc41f4506e33d919ac3bcfd5b540e7a37e4a4d4b56d5b09ea6fd34366e
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