CVE-2026-89658

Last refreshed2026-10-19

Status: UPDATED | Advisory ID: CVE-2026-89658

Key Details

CVE	CVE-2026-89658
CVSS Score / Version	9.8 (Critical) / CVSS v3.1
Updated	2026-10-19
CVSS Vector	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel

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: Prevent client use-after-free during NFSv4.0 revoked-state cleanup

nfs40_clean_admin_revoked() takes a stateid reference under

clp->cl_lock, drops nn->client_lock, and calls

nfsd4_drop_revoked_stid(), which dereferences the stateid's client

through s->sc_client->cl_lock. The stateid reference does not pin the

client, so a teardown racing the dropped lock can free the client

while nfsd4_drop_revoked_stid() is still using it.

This cleanup runs from the laundromat, so a periodic sweep can race

force_expire_client() driven by a write to the clients/<id>/ctl file.

Skip a client that is already expiring and otherwise pin it with

cl_rpc_users under client_lock before dropping the lock, matching

nfsd4_revoke_states(). (NVD)

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

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-89658
CVE	https://www.cve.org/CVERecord?id=CVE-2026-89658

Source

Reference

NVD

CVE