CVE-2026-64004
kernel: net/iucv: fix locking in .getsockopt
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · July 19, 2026
Updated · July 22, 2026
Description
A flaw was found in the Linux kernel's AF_IUCV (Inter-User Communication Vehicle) networking module. A local user can exploit a race condition between message reception and socket option retrieval, specifically when calling getsockopt(SO_MSGSIZE). This can lead to a null pointer dereference, causing the kernel to crash and 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