CVE-2026-43117

kernel: Linux kernel: btrfs filesystem crash via incorrect superblock handling with overlayfs

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Severity

Important

Red Hat Product Security

7.4

CVSS 3.1

Review impact separately from score.

Published · May 6, 2026

Updated · November 5, 2026

Description

A flaw was found in the btrfs filesystem component of the Linux kernel. When an overlay filesystem is used on top of btrfs, an incorrect superblock can be retrieved during the btrfs_sync_file() event. This misidentification can lead to a system crash, resulting in a Denial of Service (DoS).

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 · 7.4
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H

CWE-628 · Function Call with Incorrectly Specified Arguments