CVE-2021-46910

kernel: kmap_local() doubles the number of per-CPU

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Severity

Low

Red Hat Product Security

4.4

CVSS 3.1

Review impact separately from score.

Published · February 27, 2024

Updated · August 5, 2026

Description

A flaw was found in kmap_local() in the Linux Kernel that doubles the number of per-CPU fixmap slots allocated for kmap_local(). This causes the fixmap region to grow downwards beyond the start of its reserved window if the supported number of CPUs is large, eventually colliding with the newly added virtual DT mapping below it.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 4.4
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

CWE-118 · Incorrect Access of Indexable Resource ('Range Error')