CVE-2026-99133
kernel: kernel: Denial of Service via improper receive window handling in af_iucv
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · October 28, 2026
Updated · October 30, 2026
Description
A flaw was found in the Linux kernel's IUCV (Inter-User Communication Vehicle) networking subsystem. A local attacker can exploit this flaw to cause a Denial of Service (DoS) through a kernel crash or unexpected socket disconnection. The vulnerability is triggered when processing message receive requests without properly verifying the socket transport type or managing internal locks during receive window updates.
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