Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nfsd: avoid leaking pre-allocated openowner on unconfirmed retry race When find_or_alloc_open_stateowner() encounters an unconfirmed owner, it calls release_openowner() and sets oo = NULL. Control then falls through past the `if (oo)` guard -- which would have freed any pre-allocated `new` -- and unconditionally executes `new = alloc_stateowner(...)`. If `new` was already allocated on a prior iteration, the pointer is silently overwritten and the previous allocation (slab object + owner name buffer) is leaked. This requires a race: two NFSv4.0 OPEN threads with the same owner string, where a concurrent thread inserts a new unconfirmed owner into the hash between retry iterations. The window is narrow but repeatable under adversarial conditions. Fix by adding `goto retry` after `oo = NULL` so the already-allocated `new` is reused on the next iteration rather than overwritten.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.10, < 6.12.95 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/017a6150106b054cc84d1b0582d97bd3a74d4281Patch
- https://git.kernel.org/stable/c/57aee7a35bb12753057c5b65d72d1f46c0e95b07Patch
- https://git.kernel.org/stable/c/a10bf67fe06469a71a401f72f328237345d553c0Patch
- https://git.kernel.org/stable/c/c9aefb2b5f11337c9202c5bd0c45d71198449718Patch
FAQ
What is CVE-2026-53394?
CVE-2026-53394 is a vulnerability with a CVSS score of 7.5 (HIGH). In the Linux kernel, the following vulnerability has been resolved: nfsd: avoid leaking pre-allocated openowner on unconfirmed retry race When find_or_alloc_open_stateowner() encounters an unconfirm...
How severe is CVE-2026-53394?
CVE-2026-53394 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-53394?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.