- 9.8CriticalCVSS base score
- 0.71%Exploitation in 30 daysEPSS · top 46% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: NFSD: restart ssc_expire_umount walk after dropping nfsd_ssc_lock nfsd4_ssc_expire_umount() walks nn->nfsd_ssc_mount_list with list_for_each_entry_safe(ni, tmp, ...). For each expired entry it sets nsui_busy = true, drops nfsd_ssc_lock to run mntput() on the source vfsmount, then reacquires the lock to list_del + kfree the entry and continue iterating via the macro's saved tmp pointer. The nsui_busy flag protects the current ni from concurrent nfsd4_ssc_setup_dul() finders during the lock-drop window, but it does not pin tmp. Another nfsd RPC thread that fails its source- server mount and reaches nfsd4_ssc_cancel_dul() will, during that same window, take nfsd_ssc_lock, list_del + kfree its own ssc_umount item, and release the lock. If that item is the saved tmp of the expire walk, the next iteration dereferences a freed nfsd4_ssc_umount_item. Restart the walk from the head after the mntput() unlock window so no saved next pointer survives the lock-drop. The list is bounded by the number of active inter-server source mounts (typically small) and the expire delayed-work runs periodically rather than per-IO, so the restart is cheap.
Timeline
ID reserved
By Linux
Published
- 38 days later
· 38 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.71% · top 46% of all CVEs (11 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
- affected a4bc287943f5695209ff36bdc89f17b48d68fae7 – < 2b59029b8f24a99b5d844af2da3950d39d36eeea
- affected f4e44b393389c77958f7c58bf4415032b4cda15b – < d9e151fea5ed706c1284adacabd869b0be745db2
- affected f4e44b393389c77958f7c58bf4415032b4cda15b – < 659ee3da073164e1e6e40dfcbc26eeed85845f93
- affected f4e44b393389c77958f7c58bf4415032b4cda15b – < 60680ae7243b22de3d09be990d8e23bcfc4af837
- affected f4e44b393389c77958f7c58bf4415032b4cda15b – < 77de363d9a1c8cd35f20482782c612cda085791a
- affected f4e44b393389c77958f7c58bf4415032b4cda15b – < 4ed8d2317aef21cc2a9e5a55d6b59860b4b151a8
- affected f4e44b393389c77958f7c58bf4415032b4cda15b – < 7377fa964b8aaf47cb04e5efcc4c82d15e8c2ce9
- affected f4e44b393389c77958f7c58bf4415032b4cda15b – < 036c1b182f4da65363e79ec0ac276edc6b7296e5
- affected 5.10.220 – < 5.10.270
- affected 5.14
- unaffected < 5.14
- unaffected 5.10.270 – ≤ 5.10.*
- unaffected 5.15.221 – ≤ 5.15.*
- unaffected 6.1.188 – ≤ 6.1.*
- unaffected 6.6.157 – ≤ 6.6.*
- unaffected 6.12.109 – ≤ 6.12.*
- unaffected 6.18.50 – ≤ 6.18.*
- unaffected 7.2.4 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/2b59029b8f24a99b5d844af2da3950d39d36eeea (opens in a new tab)
- https://git.kernel.org/stable/c/d9e151fea5ed706c1284adacabd869b0be745db2 (opens in a new tab)
- https://git.kernel.org/stable/c/659ee3da073164e1e6e40dfcbc26eeed85845f93 (opens in a new tab)
- https://git.kernel.org/stable/c/60680ae7243b22de3d09be990d8e23bcfc4af837 (opens in a new tab)
- https://git.kernel.org/stable/c/77de363d9a1c8cd35f20482782c612cda085791a (opens in a new tab)
- https://git.kernel.org/stable/c/4ed8d2317aef21cc2a9e5a55d6b59860b4b151a8 (opens in a new tab)
- https://git.kernel.org/stable/c/7377fa964b8aaf47cb04e5efcc4c82d15e8c2ce9 (opens in a new tab)
- https://git.kernel.org/stable/c/036c1b182f4da65363e79ec0ac276edc6b7296e5 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-76624 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-89712)Record last updated .