NULL pointer dereference in Linux kernel - CVE-2026-89544
Published: September 12, 2026
Vulnerability identifier: #VU149263
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89544
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper error handling in the SUNRPC gssx XDR option-array decoder when handling an allocation failure while decoding an option array. A local user can trigger the decoder's error path to cause a denial of service.
The affected error paths also include a group_info reference-count leak and a latent use-after-free condition.
Affected software
Linux kernel
How to mitigate CVE-2026-89544
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3