CVE-2026-89699nfsd: validate symlink target length in NFSv4 CREATE
- 7.5HighCVSS base score
- 0.50%Exploitation in 30 daysEPSS · top 57% 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: validate symlink target length in NFSv4 CREATE nfsd4_decode_create() accepts an unbounded cr_datalen from the wire for NF4LNK symlink targets, allowing a client to force a kmalloc of up to the maximum RPC payload size (several MiB) per COMPOUND op that persists until compound teardown. The VFS rejects oversized targets with ENAMETOOLONG, but the allocation has already occurred. Reject cr_datalen == 0 early with nfserr_inval and cr_datalen greater than NFS4_MAXPATHLEN (PATH_MAX) with nfserr_nametoolong to bound the allocation.
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 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Received | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.50% · top 57% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 36011308b3f01ce7dc9954f3cefcbb5291af9f95
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 888dad4b557352cf85be31613407b5ba51ad07d1
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 8661d3cb38fd148947e57dbc0871fd4d3fa33bbf
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 3ef5e7a01a4d74995a65496bc9166d1e980a4355
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < b24843ea3de1676b29902457b38507c95a80649b
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 895a485cd3758031ef9993c0d53cf19ce8fb4ccc
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 45ec115cbfecb4b3cfab7fca6f73d1b60696a25a
- affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – < 041f57056e5fb9c80adc088269322d2c61074406
- affected 2.6.12
- unaffected < 2.6.12
- 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/36011308b3f01ce7dc9954f3cefcbb5291af9f95 (opens in a new tab)
- https://git.kernel.org/stable/c/888dad4b557352cf85be31613407b5ba51ad07d1 (opens in a new tab)
- https://git.kernel.org/stable/c/8661d3cb38fd148947e57dbc0871fd4d3fa33bbf (opens in a new tab)
- https://git.kernel.org/stable/c/3ef5e7a01a4d74995a65496bc9166d1e980a4355 (opens in a new tab)
- https://git.kernel.org/stable/c/b24843ea3de1676b29902457b38507c95a80649b (opens in a new tab)
- https://git.kernel.org/stable/c/895a485cd3758031ef9993c0d53cf19ce8fb4ccc (opens in a new tab)
- https://git.kernel.org/stable/c/45ec115cbfecb4b3cfab7fca6f73d1b60696a25a (opens in a new tab)
- https://git.kernel.org/stable/c/041f57056e5fb9c80adc088269322d2c61074406 (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-2026-76611 (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-2026-89699)Record last updated .