CVE-2026-22989
Medium · 5.5CVSS
5.5
EPSS
0.1%
Published
Jan 23, 2026
CISA due date
—
The record
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().
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| Linux | Kernel | 6.9.0 | 6.12.66 |
| openSUSE:Leap 16.0 | dtb-aarch64 | 0 | 6.12.0-160000.26.1 |
| openSUSE:Leap 16.0 | kernel-64kb | 0 | 6.12.0-160000.26.1 |
| openSUSE:Leap 16.0 | kernel-azure | 0 | 6.12.0-160000.26.1 |
| openSUSE:Leap 16.0 | kernel-default | 0 | 6.12.0-160000.26.1 |
| openSUSE:Leap 16.0 | kernel-default-base | 0 | 6.12.0-160000.26.1.160000.2.7 |
| openSUSE:Leap 16.0 | kernel-docs | 0 | 6.12.0-160000.26.1 |
| openSUSE:Leap 16.0 | kernel-kvmsmall | 0 | 6.12.0-160000.26.1 |
| openSUSE:Leap 16.0 | kernel-obs-build | 0 | 6.12.0-160000.26.1 |
| openSUSE:Leap 16.0 | kernel-obs-qa | 0 | 6.12.0-160000.26.1 |
| openSUSE:Leap 16.0 | kernel-rt | 0 | 6.12.0-160000.26.1 |
| openSUSE:Leap 16.0 | kernel-source | 0 | 6.12.0-160000.26.1 |
| openSUSE:Leap 16.0 | kernel-syms | 0 | 6.12.0-160000.26.1 |
| openSUSE:Leap 16.0 | kernel-zfcpdump | 0 | 6.12.0-160000.26.1 |
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