NULL pointer dereference in Linux kernel - CVE-2026-89552
Published: September 12, 2026
Vulnerability identifier: #VU149257
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89552
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 handling of allocation failures in param_set_charp() when updating charp parameters after slab allocation is available. A local user can update a charp parameter during an allocation failure to cause a denial of service.
The issue can be triggered by a failed zswap compressor update before zswap is initialized.
Affected software
Linux kernel
How to mitigate CVE-2026-89552
Install security update from vendor's repository.