Unchecked Return Value in Linux kernel - CVE-2026-89547
Published: September 12, 2026
Vulnerability identifier: #VU149252
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89547
CWE-ID: CWE-252
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local privileged user to corrupt kernel memory.
The vulnerability exists due to unchecked return values in the SUNRPC RPC service pool counter initialization in __svc_create() when starting an RPC service while per-CPU counter allocation fails. A local privileged user can start an RPC service under allocation failure conditions to corrupt kernel memory.
Exploitation requires memory pressure or fault injection during RPC server startup; a remote peer cannot induce the failed allocation state on its own.
Affected software
Linux kernel
How to mitigate CVE-2026-89547
Install security update from vendor's repository.