CVE-2021-28951
Public on 2021-03-20
Modified on 2023-04-03
Description
An issue was discovered in fs/io_uring.c in the Linux kernel through 5.11.8. It allows attackers to cause a denial of service (deadlock) because exit may be waiting to park a SQPOLL thread, but concurrently that SQPOLL thread is waiting for a signal to start, aka CID-3ebba796fa25.
Severity
Medium
CVSS v3 Base Score
See breakdown
Affected Packages
| Platform | Package | Release Date | Advisory | Status |
|---|---|---|---|---|
| Amazon Linux 1 | kernel | Not Affected | ||
| Amazon Linux 2 - Kernel-5.10 Extra | kernel | 2023-04-13 | ALAS2KERNEL-5.10-2023-030 | Fixed |
| Amazon Linux 2 - Kernel-5.10 Extra | kernel | 2024-05-23 | ALAS2KERNEL-5.10-2024-058 | Fixed |
| Amazon Linux 2 - Kernel-5.15 Extra | kernel | 2023-06-29 | ALAS2KERNEL-5.15-2023-023 | Fixed |
| Amazon Linux 2023 | kernel | Not Affected | ||
| Amazon Linux 2 - Core | kernel-4.14 | Pending Fix | ||
| Amazon Linux 2 - Core | kernel-5.10 kernel-5.15 | Pending Fix | ||
| Amazon Linux 2023 | kernel-5.15 | Pending Fix | ||
| Amazon Linux 2 - Core | kernel-5.4 | Pending Fix |
CVSS Scores
| Score Type | Score | Vector | |
|---|---|---|---|
| Amazon Linux | CVSSv3 | 5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| NVD | CVSSv3 | 5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| NVD | CVSSv2 | 4.9 | AV:L/AC:L/Au:N/C:N/I:N/A:C |