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CVE-2021-22543

Public on 2021-05-26
Modified on 2021-10-04
Description

A flaw was found in the Linux kernel's KVM implementation, where improper handing of the VM_IO|VM_PFNMAP VMAs in KVM bypasses RO checks and leads to pages being freed while still accessible by the VMM and guest. This flaw allows users who can start and control a VM to read/write random pages of memory, resulting in local privilege escalation. The highest threat from this vulnerability is to confidentiality, integrity, and system availability.

Severity
Important
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CVSS v3 Base Score
7.0
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Affected Packages

Platform Package Release Date Advisory
Amazon Linux 1 kernel 2021-09-30 19:25 ALAS-2021-1539
Amazon Linux 2 - Core kernel 2021-08-13 17:31 ALAS2-2021-1699
Amazon Linux 2 - Kernel-5.10 Extra kernel 2022-01-20 23:37 ALAS2KERNEL-5.10-2022-002
Amazon Linux 2 - Kernel-5.4 Extra kernel 2022-01-12 19:26 ALAS2KERNEL-5.4-2022-004

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 7.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L