CVE-2026-89671nfsd: gate nfs3 setacl by argp->mask
- 9.1CriticalCVSS base score
- 0.55%Exploitation in 30 daysEPSS · top 54% 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: gate nfs3 setacl by argp->mask nfsd3_proc_setacl() calls set_posix_acl() unconditionally for both ACL_TYPE_ACCESS and ACL_TYPE_DEFAULT, passing argp->acl_access and argp->acl_default verbatim. The NFSv3 ACL decoder only populates those pointers when the corresponding mask bit is set: nfs3svc_decode_setaclargs() if (args->mask & NFS_ACL) decode into acl_access if (args->mask & NFS_DFACL) decode into acl_default /* otherwise the pointer stays NULL (pc_argzero) */ nfsd3_proc_setacl() set_posix_acl(.., ACL_TYPE_ACCESS, argp->acl_access) set_posix_acl(.., ACL_TYPE_DEFAULT, argp->acl_default) set_posix_acl(idmap, dentry, type, NULL) is the VFS "remove this ACL type" operation. A NULL pointer that means "the client did not send this arm" is therefore indistinguishable from "the client asked to remove this ACL". A SETACL with mask=NFS_ACL silently drops the directory's default ACL; mask=0 drops both. The sibling nfsd3_proc_getacl() already consults argp->mask before touching each arm; mirror that in setacl. Fix by wrapping each set_posix_acl() call in the matching mask bit check and initializing error to 0 before inode_lock so that a request with neither bit set leaves the on-disk ACLs untouched and returns nfs_ok. The out_drop_lock path and the unconditional posix_acl_release() at out: are preserved; both NULL-tolerate the skipped arms.
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 | Critical9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
| NVDNVD · Received | 3.1 | Critical9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
- EPSS (exploitation in 30 days)
- 0.55% · top 54% of all CVEs (12 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 9.1.
Affected products
- affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 – < beeb33152873ad40692bd255b562966f8ba43dbd
- affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 – < 3be1d8611dae4829e4608007db29f4a8748c37b2
- affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 – < 68a80b26efdff1d09f8ae1773c6a915abb9e191d
- affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 – < b3bff820d068ea59767d4e91a3258231a879da5f
- affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 – < ff99ed007f065198fd723152405c22aa558f700b
- affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 – < 453d7198a0ab07a12d46e0575861ac7b932da17e
- affected 2.6.13
- unaffected < 2.6.13
- unaffected 6.1.191 – ≤ 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
References6
- https://git.kernel.org/stable/c/beeb33152873ad40692bd255b562966f8ba43dbd (opens in a new tab)
- https://git.kernel.org/stable/c/3be1d8611dae4829e4608007db29f4a8748c37b2 (opens in a new tab)
- https://git.kernel.org/stable/c/68a80b26efdff1d09f8ae1773c6a915abb9e191d (opens in a new tab)
- https://git.kernel.org/stable/c/b3bff820d068ea59767d4e91a3258231a879da5f (opens in a new tab)
- https://git.kernel.org/stable/c/ff99ed007f065198fd723152405c22aa558f700b (opens in a new tab)
- https://git.kernel.org/stable/c/453d7198a0ab07a12d46e0575861ac7b932da17e (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-2026-76583 (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-2026-89671)Record last updated .