Improper control of a resource through its lifetime in Linux kernel - CVE-2026-89903
Published: September 17, 2026
Vulnerability identifier: #VU150379
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89903
CWE-ID: CWE-664
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service and corrupt kernel state.
The vulnerability exists due to improper restoration of a stale per-CPU base register in the LoongArch rethook trampoline when a task migrates to another CPU during rethook trampoline handling. A local user can trigger task migration during rethook trampoline handling to cause a denial of service and corrupt kernel state.
Affected software
Linux kernel
How to mitigate CVE-2026-89903
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/266ffc92e68593759adfe3d58f188773d32782c3
- https://git.kernel.org/stable/c/8f15e95b438bc6b3c9f23a33c9a0d0678ebd1dc8
- https://git.kernel.org/stable/c/a03b5e7483ad2c33ba5dd2adb8552e84bfee8fe2
- https://git.kernel.org/stable/c/c048b0a3c0836c4b1bef4b51d355d27090bf6790
- https://git.kernel.org/stable/c/c3f2feace5e4f4b01b68b9f947b19adb4155c32e