CVE-2026-89672nfsd: gate nfs2 setacl by argp->mask
- 9.1CriticalCVSS base score
- 0.60%Exploitation in 30 daysEPSS · top 51% 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 nfs2 setacl by argp->mask The NFSACL v2 SETACL path shares the decoder convention used by its v3 sibling: nfsaclsvc_decode_setaclargs() fills in argp->acl_access only when NFS_ACL is set in the request mask and argp->acl_default only when NFS_DFACL is set, leaving the other pointer NULL because the argument buffer is zeroed up to pc_argzero before decode. nfsacld_proc_setacl() then hands both pointers to set_posix_acl() unconditionally. set_posix_acl(idmap, dentry, type, NULL) is the VFS "remove this ACL type" operation, so an omitted arm is indistinguishable from an explicit request to delete that ACL. A SETACL carrying only NFS_ACL silently strips the directory's default ACL; mask=0 strips both. This is the same defect just fixed in nfsd3_proc_setacl(); apply the same remedy. Gate each set_posix_acl() call on its mask bit and initialize error to 0 so that a request with neither bit set leaves the on-disk ACLs untouched and returns success. The out_drop_lock path and the unconditional posix_acl_release() in nfsaclsvc_release_setacl() already 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)
- 0.60% · top 51% of all CVEs (13 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 – < d00a2f81ba7c57045bd644971ddb6961c5efe3e0
- affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 – < 760e7a4f92f597c61ab6b089f934a7e3acf238b7
- affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 – < 54ff9c81d6b77de4540ba33a3b4d613ce3194863
- affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 – < 8e4422b05f410f95c51b68a0db4bf1d87f6d22f5
- affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 – < e41d173d9dc735cecb15ab7aa63ecab09338f81b
- affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 – < f951b22dbeec46f2e0fba81cb80d1b0c686b61eb
- affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 – < 37eea38e7898538f0ec5f1eb8b18d8646e4be41c
- affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 – < a3a7e20ed66d3f04d37883c398da8a113b430769
- affected 2.6.13
- unaffected < 2.6.13
- unaffected 5.10.273 – ≤ 5.10.*
- unaffected 5.15.224 – ≤ 5.15.*
- 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
References8
- https://git.kernel.org/stable/c/d00a2f81ba7c57045bd644971ddb6961c5efe3e0 (opens in a new tab)
- https://git.kernel.org/stable/c/760e7a4f92f597c61ab6b089f934a7e3acf238b7 (opens in a new tab)
- https://git.kernel.org/stable/c/54ff9c81d6b77de4540ba33a3b4d613ce3194863 (opens in a new tab)
- https://git.kernel.org/stable/c/8e4422b05f410f95c51b68a0db4bf1d87f6d22f5 (opens in a new tab)
- https://git.kernel.org/stable/c/e41d173d9dc735cecb15ab7aa63ecab09338f81b (opens in a new tab)
- https://git.kernel.org/stable/c/f951b22dbeec46f2e0fba81cb80d1b0c686b61eb (opens in a new tab)
- https://git.kernel.org/stable/c/37eea38e7898538f0ec5f1eb8b18d8646e4be41c (opens in a new tab)
- https://git.kernel.org/stable/c/a3a7e20ed66d3f04d37883c398da8a113b430769 (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-2026-76584 (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-2026-89672)Record last updated .