CVE-2026-53397nfsd: fix posix_acl leak on SETACL decode failure
- 7.5HighCVSS base score
- 0.53%Exploitation in 30 daysEPSS · top 55% 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 posix_acl leak on SETACL decode failure nfsaclsvc_decode_setaclargs() and nfs3svc_decode_setaclargs() each call nfs_stream_decode_acl() twice, first for NFS_ACL and then for NFS_DFACL. Each successful call transfers ownership of a freshly allocated posix_acl into argp->acl_access or argp->acl_default. If the first call succeeds but the second fails, the decoder returns false and argp->acl_access is left dangling. ACLPROC2_SETACL.pc_release was wired to nfssvc_release_attrstat and ACLPROC3_SETACL.pc_release was wired to nfs3svc_release_fhandle. Both only call fh_put() and have no knowledge of the ACL fields on argp. The posix_acl_release() pairs sat at the out: labels inside nfsacld_proc_setacl() and nfsd3_proc_setacl(), but svc_process() skips pc_func when pc_decode returns false, so that cleanup is unreachable on decode failure: svc_process_common() pc_decode() /* decode_setaclargs: false */ /* pc_func skipped */ pc_release() /* fh_put only -- ACLs leaked */ The orphaned posix_acl is leaked for the lifetime of the server. Fix by adding nfsaclsvc_release_setacl() and nfs3svc_release_setacl(), which release both argp->acl_access and argp->acl_default in addition to fh_put(), and wiring them as pc_release for their respective SETACL procedures. pc_release runs on every path svc_process() takes after decode, including decode failure, so the posix_acl_release() pairs are removed from the proc functions' out: labels to keep ownership in one place. This matches the existing release_getacl() pattern used by the sibling GETACL procedures.
Timeline
ID reserved
By Linux
- 40 days later
· 40 days later
Published
- 3 months later
· 3 months 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 · Modified | 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)
- 0.53% · top 55% 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 a257cdd0e2179630d3201c32ba14d7fcb3c3a055 – < b2eb1ffd511d1b3c3e21122f97cbbccea411e277
- affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 – < b94c4be77682aab06d65ca7296149e3bcfb37353
- affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 – < 887f92ceccf3eacd5f2402db21254d66372fae00
- affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 – < 1e96239fddcefacf6afe6c498357be68eacbcabc
- affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 – < bd69a825485168ef74e815ecb286754b570fdcc7
- affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 – < 136b416593f1349cf6f72c8e3d18f0f204ee8545
- affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 – < a5b42c1e4ff2befaa6b96f7cbf32174751eba083
- affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 – < 0853ac544c590880d797b04daa33fcb72b6be0e1
- affected 2.6.13
- unaffected < 2.6.13
- unaffected 5.10.260 – ≤ 5.10.*
- unaffected 5.15.211 – ≤ 5.15.*
- unaffected 6.1.177 – ≤ 6.1.*
- unaffected 6.6.144 – ≤ 6.6.*
- unaffected 6.12.95 – ≤ 6.12.*
- unaffected 6.18.38 – ≤ 6.18.*
- unaffected 7.1.3 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References8
- https://git.kernel.org/stable/c/b2eb1ffd511d1b3c3e21122f97cbbccea411e277 (opens in a new tab)
- https://git.kernel.org/stable/c/b94c4be77682aab06d65ca7296149e3bcfb37353 (opens in a new tab)
- https://git.kernel.org/stable/c/887f92ceccf3eacd5f2402db21254d66372fae00 (opens in a new tab)
- https://git.kernel.org/stable/c/1e96239fddcefacf6afe6c498357be68eacbcabc (opens in a new tab)
- https://git.kernel.org/stable/c/bd69a825485168ef74e815ecb286754b570fdcc7 (opens in a new tab)
- https://git.kernel.org/stable/c/136b416593f1349cf6f72c8e3d18f0f204ee8545 (opens in a new tab)
- https://git.kernel.org/stable/c/a5b42c1e4ff2befaa6b96f7cbf32174751eba083 (opens in a new tab)
- https://git.kernel.org/stable/c/0853ac544c590880d797b04daa33fcb72b6be0e1 (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-2026-45519 (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)
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[](https://cveledger.app/cve/CVE-2026-53397)Record last updated .