🛡️ CVE-2026-22989 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

nfsd: check that server is running in unlock_filesystem

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

nfsd: check that server is running in unlock_filesystem

If we are trying to unlock the filesystem via an administrative

interface and nfsd isn't running, it crashes the server. This

happens currently because nfsd4_revoke_states() access state

structures (eg., conf_id_hashtbl) that has been freed as a part

of the server shutdown.

[ 59.465072] Call trace:

[ 59.465308] nfsd4_revoke_states+0x1b4/0x898 [nfsd] (P)

[ 59.465830] write_unlock_fs+0x258/0x440 [nfsd]

[ 59.466278] nfsctl_transaction_write+0xb0/0x120 [nfsd]

[ 59.466780] vfs_write+0x1f0/0x938

[ 59.467088] ksys_write+0xfc/0x1f8

[ 59.467395] __arm64_sys_write+0x74/0xb8

[ 59.467746] invoke_syscall.constprop.0+0xdc/0x1e8

[ 59.468177] do_el0_svc+0x154/0x1d8

[ 59.468489] el0_svc+0x40/0xe0

[ 59.468767] el0t_64_sync_handler+0xa0/0xe8

[ 59.469138] el0t_64_sync+0x1ac/0x1b0

Ensure this can't happen by taking the nfsd_mutex and checking that

the server is still up, and then holding the mutex across the call to

nfsd4_revoke_states().

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Affected software

CVE-2026-22989 is recorded against 2 packages.

  • kernel (from 6.13.0 up to 6.18.6)
  • linux-kernel

Timeline and source

Published on 23 January 2026 and last revised on 15 July 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2026-22989 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-01-23
Updated 2026-08-12
Modified 2026-07-15

Affected Packages

Software From version Fixed in
kernel 6.13.0 6.18.6
linux-kernel — —

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