CVE-2026-31437
kernel: netfs: Fix NULL pointer dereference in netfs_unbuffered_write() on retry
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · April 22, 2026
Updated · June 28, 2026
Description
A flaw was found in the Linux kernel's netfs component. When a write operation is retried, the netfs_unbuffered_write() function can attempt to access a non-existent function, leading to a NULL pointer dereference. This vulnerability can be triggered by specific filesystem configurations, such as 9P, and could allow a local attacker to cause 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 · 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-476 · NULL Pointer Dereference