CVE-2026-53394
CVE CVE-2026-53394EUVD EUVD-2026-45516Published 2026-07-19T12:01:57.000ZLast changed 2026-08-05T12:35:33.000ZCVSS 7.5
What the advisory describes
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.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux patch: 7.2-rc1; 23df17788c6212809848f836b10c4f85b16843a5 <57aee7a35bb12753057c5b65d72d1f46c0e95b07; 23df17788c6212809848f836b10c4f85b16843a5 <017a6150106b054cc84d1b0582d97bd3a74d4281; 6.10; 23df17788c6212809848f836b10c4f85b16843a5 <a10bf67fe06469a71a401f72f328237345d553c0; 23df17788c6212809848f836b10c4f85b16843a5 <c9aefb2b5f11337c9202c5bd0c45d71198449718; patch: 6.12.95; patch: 0; patch: 7.1.3; patch: 6.18.38
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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