CVE-2026-64419

kernel: mm/shrinker: do not hold RCU lock in shrinker_debugfs_count_show()

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Severity

Low

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · July 25, 2026

Updated · September 9, 2026

Description

A flaw was found in the Linux kernel. A local user could trigger a system crash by reading a specific debugfs "count" file related to memory management. This issue arises because a function attempts to perform an operation that can cause it to pause (sleep) while holding a critical system lock, which is an invalid operation. This vulnerability could lead to a denial of service, making the system unavailable.

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 · 5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-663 · Use of a Non-reentrant Function in a Concurrent Context