CVE-2026-98941

kernel: kernel: Denial of Service via large folios on encrypted ext4 files

Loading…

Severity

Moderate

Red Hat Product Security

4.7

CVSS 3.1

Review impact separately from score.

Published · October 23, 2026

Updated · October 30, 2026

Description

A flaw was found in the Linux kernel's ext4 filesystem. A local user can cause a denial of service (DoS) and system crash by writing encrypted data to an ext4 filesystem when encryption is enabled after mounting. This occurs because the filesystem bypasses compatibility checks for large memory blocks (folios), resulting in a kernel null pointer dereference.

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 · 4.7
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-476 · NULL Pointer Dereference