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CVE-2020-12657

Status Candidate

Overview

An issue was discovered in the Linux kernel before 5.6.5. There is a use-after-free in block/bfq-iosched.c related to bfq_idle_slice_timer_body.

Related Files

Ubuntu Security Notice USN-4369-1
Posted May 21, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4369-1 - It was discovered that the btrfs implementation in the Linux kernel did not properly detect that a block was marked dirty in some situations. An attacker could use this to specially craft a file system image that, when unmounted, could cause a denial of service. Tristan Madani discovered that the file locking implementation in the Linux kernel contained a race condition. A local attacker could possibly use this to cause a denial of service or expose sensitive information. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2019-19377, CVE-2019-19769, CVE-2020-11494, CVE-2020-11565, CVE-2020-11608, CVE-2020-11609, CVE-2020-11668, CVE-2020-12657
MD5 | 6d0bd201f6f7817bc3279a320a6733e2
Ubuntu Security Notice USN-4367-1
Posted May 20, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4367-1 - It was discovered that the btrfs implementation in the Linux kernel did not properly detect that a block was marked dirty in some situations. An attacker could use this to specially craft a file system image that, when unmounted, could cause a denial of service. It was discovered that the linux kernel did not properly validate certain mount options to the tmpfs virtual memory file system. A local attacker with the ability to specify mount options 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-2019-19377, CVE-2020-11565, CVE-2020-12657
MD5 | 6bc265d53b8c9946b979ffba8c1b9846
Ubuntu Security Notice USN-4368-1
Posted May 20, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4368-1 - Tristan Madani discovered that the file locking implementation in the Linux kernel contained a race condition. A local attacker could possibly use this to cause a denial of service or expose sensitive information. 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. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2019-19769, CVE-2020-11494, CVE-2020-11565, CVE-2020-11608, CVE-2020-11609, CVE-2020-11668, CVE-2020-11669, CVE-2020-12657
MD5 | b302dbba64749b9c4db508af02be0333
Ubuntu Security Notice USN-4363-1
Posted May 18, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4363-1 - 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. It was discovered that the linux kernel did not properly validate certain mount options to the tmpfs virtual memory file system. A local attacker with the ability to specify mount options 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-2020-11494, CVE-2020-11565, CVE-2020-11669, CVE-2020-12657
MD5 | 48a0a77413a79e658053d75f2fdc48ee
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