CVE-2026-90036 Affecting kernel-devel-matched package, versions <0:6.12.0-211.66.1.el10_2


Severity

Recommended
high

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
0.47% (39th percentile)

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  • Snyk IDSNYK-ALMALINUX10-KERNELDEVELMATCHED-21245712
  • published19 Oct 2026
  • disclosed14 Oct 2026

Introduced: 14 Oct 2026

NewCVE-2026-90036  (opens in a new tab)

How to fix?

Upgrade AlmaLinux:10 kernel-devel-matched to version 0:6.12.0-211.66.1.el10_2 or higher.
This issue was patched in ALSA-2026:83207.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-devel-matched package and not the kernel-devel-matched package as distributed by AlmaLinux. See How to fix? for AlmaLinux:10 relevant fixed versions and status.

In the Linux kernel, the following vulnerability has been resolved:

NFSD: Prevent client use-after-free during blocked-lock reaping

A bare lock owner -- its only remaining reference a blocked lock on nn->blocked_locks_lru -- holds a raw pointer to its nfs4_client but no reference keeping the client alive. When the per-net laundromat reaps such a lock, freeing the nbl drops the owner reference held through flc_owner, and the final nfs4_put_stateowner() takes the client's cl_lock. Because the laundromat detaches the nbl first, __destroy_client() no longer finds it, so a concurrent force_expire_client() can free the client before nfs4_put_stateowner() runs, dereferencing cl_lock in freed memory.

Pin the client with cl_rpc_users before dropping nn->blocked_locks_lock, and skip clients already expiring, whose blocked locks __destroy_client() frees while holding an owner reference. Take nn->client_lock outside nn->blocked_locks_lock. Every other site holds nn->blocked_locks_lock as a leaf, acquiring no further lock, so placing nn->client_lock outside it cannot form a lock-order cycle.

CVSS Base Scores

version 3.1