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CVE-2021-3491

Public on 2021-06-04
Modified on 2024-03-01
Description

A flaw was found in the Linux kernel. The io_uring PROVIDE_BUFFERS operation allowed the MAX_RW_COUNT limit to be bypassed, which led to negative values being used in mem_rw when reading /proc/<PID>/mem. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Severity
Important
See what this means
CVSS v3 Base Score
7.4
See breakdown

Affected Packages

Platform Package Release Date Advisory
Amazon Linux 2 - Kernel-5.10 Extra kernel 2022-01-20 23:18 ALAS2KERNEL-5.10-2022-001
Amazon Linux 2 - Kernel-5.10 Extra kernel 2022-01-20 23:37 ALAS2KERNEL-5.10-2022-002

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 7.4 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD CVSSv2 7.2 AV:L/AC:L/Au:N/C:C/I:C/A:C
NVD CVSSv3 8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

References

Red Hat: CVE-2021-3491 Mitre: CVE-2021-3491 FAQs regarding Amazon Linux ALAS/CVE Severity