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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
See what this means
CVSS v3 Base Score
5.5
See breakdown

Affected Packages

Platform Package Release Date Advisory
Amazon Linux 2 - Kernel-5.10 Extra kernel 2023-04-13 19:51 ALAS2KERNEL-5.10-2023-030
Amazon Linux 2 - Kernel-5.10 Extra kernel 2024-05-23 23:02 ALAS2KERNEL-5.10-2024-058
Amazon Linux 2 - Kernel-5.15 Extra kernel 2023-06-29 23:20 ALAS2KERNEL-5.15-2023-023

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

References

Red Hat: CVE-2021-28951 Mitre: CVE-2021-28951 FAQs regarding Amazon Linux ALAS/CVE Severity