CVE-2026-45915

kernel: fat: avoid parent link count underflow in rmdir

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Severity

Low

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · May 27, 2026

Updated · October 29, 2026

Description

A flaw was found in the Linux kernel's handling of FAT (File Allocation Table) filesystems. When processing corrupted FAT images, the rmdir function can incorrectly decrement the parent directory's link count. This underflow can lead to a system instability or a denial of service (DoS) by triggering a kernel warning (WARN_ON) in the drop_nlink() function.

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-191 · Integer Underflow (Wrap or Wraparound)