CVE-2020-12657
Public on 2020-05-05
Modified on 2020-07-15
Description
A flaw was found in the Linux kernel's implementation of the BFQ IO scheduler. This flaw allows a local user able to groom system memory to cause kernel memory corruption and possible privilege escalation by abusing a race condition in the IO scheduler.
Severity
Important
CVSS v3 Base Score
See breakdown
Affected Packages
| Platform | Package | Release Date | Advisory | Status |
|---|---|---|---|---|
| Amazon Linux 1 | kernel | 2020-05-11 | ALAS-2020-1366 | Fixed |
| Amazon Linux 1 | kernel | 2020-06-23 | ALAS-2020-1382 | Fixed |
| Amazon Linux 2 - Core | kernel | 2020-06-16 | ALAS2-2020-1440 | Fixed |
| Amazon Linux 2 - Livepatch Extra | kernel-livepatch-4.14.171-136.231 | 2020-05-29 | ALAS2LIVEPATCH-2020-011 | Fixed |
| Amazon Linux 2 - Livepatch Extra | kernel-livepatch-4.14.173-137.228 | 2020-05-29 | ALAS2LIVEPATCH-2020-012 | Fixed |
| Amazon Linux 2 - Livepatch Extra | kernel-livepatch-4.14.173-137.229 | 2020-05-29 | ALAS2LIVEPATCH-2020-013 | Fixed |
CVSS Scores
| Score Type | Score | Vector | |
|---|---|---|---|
| Amazon Linux | CVSSv3 | 7.0 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD | CVSSv2 | 4.6 | AV:L/AC:L/Au:N/C:P/I:P/A:P |
| NVD | CVSSv3 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |