CVE-2026-53394

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-53394

Key Details

CVE	CVE-2026-53394
CVSS Score / Version	7.5 (High) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`
CVSS Prose	attack vector is network; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is none; integrity impact is none; availability impact is high.
Affected products	Linux Kernel
Classified as	CWE-401 (Missing Release of Memory after Effective Lifetime)

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

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. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-53394
CVE	https://www.cve.org/CVERecord?id=CVE-2026-53394

Source

Reference

NVD

CVE