- 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: fix BUG_ON in nfsd4_alloc_layout_stateid on racing delegation revoke nfsd4_alloc_layout_stateid reads fp->fi_deleg_file without holding fi_lock when the parent stateid is a delegation. A concurrent delegation revoke via the laundromat can clear fi_deleg_file under fi_lock, causing nfsd_file_get() to return NULL and triggering the BUG_ON. This race is client-reachable: two NFS clients can trigger it by having one hold a delegation while another opens the same file to force a recall. When the first client doesn't respond to the recall, the laundromat revokes it. A concurrent LAYOUTGET from any client using the delegation stateid hits the race window. Fix this by taking fi_lock around the fi_deleg_file read in the SC_TYPE_DELEG path, matching the locking discipline of the find_any_file() arm, and replacing the BUG_ON with a graceful error return that cleans up the partially-initialized layout stateid.
Timeline
ID reserved
By Linux
Published
- 49 days later
· 49 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)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
- affected c5c707f96fc9a6e5a57ca5baac892673270abe3d – < f5011c26246d1abed3dc750c9744e33cb79ff9bc
- affected c5c707f96fc9a6e5a57ca5baac892673270abe3d – < d12af460df27876661707efab3a8532146cb961f
- affected c5c707f96fc9a6e5a57ca5baac892673270abe3d – < c517f27498757e616d2a8fe6d16caad1fee422e6
- affected c5c707f96fc9a6e5a57ca5baac892673270abe3d – < 607a56fea772c1f4f4989d8e255dd4f7192d9604
- affected c5c707f96fc9a6e5a57ca5baac892673270abe3d – < 97bda8b4284d90897a1f1922e5082ff9e35d7c7e
- affected c5c707f96fc9a6e5a57ca5baac892673270abe3d – < ca94ba36172046be6a694a7986f6931e47ed4d51
- affected 4.0
- unaffected < 4.0
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.160 – ≤ 6.6.*
- unaffected 6.12.109 – ≤ 6.12.*
- unaffected 6.18.50 – ≤ 6.18.*
- unaffected 7.2.4 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References6
- https://git.kernel.org/stable/c/f5011c26246d1abed3dc750c9744e33cb79ff9bc (opens in a new tab)
- https://git.kernel.org/stable/c/d12af460df27876661707efab3a8532146cb961f (opens in a new tab)
- https://git.kernel.org/stable/c/c517f27498757e616d2a8fe6d16caad1fee422e6 (opens in a new tab)
- https://git.kernel.org/stable/c/607a56fea772c1f4f4989d8e255dd4f7192d9604 (opens in a new tab)
- https://git.kernel.org/stable/c/97bda8b4284d90897a1f1922e5082ff9e35d7c7e (opens in a new tab)
- https://git.kernel.org/stable/c/ca94ba36172046be6a694a7986f6931e47ed4d51 (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-2026-76598 (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-2026-89686)Record last updated .