CVE-2026-53394nfsd: avoid leaking pre-allocated openowner on unconfirmed retry race
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 23df17788c6212809848f836b10c4f85b16843a5 before c9aefb2b5f11337c9202c5bd0c45d71198449718; 23df17788c6212809848f836b10c4f85b16843a5 builds before 017a6150106b054cc84d1b0582d97bd3a74d4281; from 23df17788c6212809848f836b10c4f85b16843a5 before a10bf67fe06469a71a401f72f328237345d553c0; from 23df17788c6212809848f836b10c4f85b16843a5 before 57aee7a35bb12753057c5b65d72d1f46c0e95b07 | CNA record |
linux linux_kernel linux:linux_kernel | from 6.10 before 6.12.95; from 6.13 before 6.18.38; from 6.19 before 7.1.3 | NVD |
References
- https://git.kernel.org/stable/c/c9aefb2b5f11337c9202c5bd0c45d71198449718patch
- https://git.kernel.org/stable/c/017a6150106b054cc84d1b0582d97bd3a74d4281patch
- https://git.kernel.org/stable/c/a10bf67fe06469a71a401f72f328237345d553c0patch
- https://git.kernel.org/stable/c/57aee7a35bb12753057c5b65d72d1f46c0e95b07patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.