nfsd: fix posix_acl leak on SETACL decode failure

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-53397
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 12:16:50 UTC
Updated2026-07-20 15:16:42 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.001770000 probability, percentile 0.074140000 (date 2026-07-20)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 b2eb1ffd511d1b3c3e21122f97cbbccea411e277 git Not specified
CNA Linux Linux affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 b94c4be77682aab06d65ca7296149e3bcfb37353 git Not specified
CNA Linux Linux affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 887f92ceccf3eacd5f2402db21254d66372fae00 git Not specified
CNA Linux Linux affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 1e96239fddcefacf6afe6c498357be68eacbcabc git Not specified
CNA Linux Linux affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 bd69a825485168ef74e815ecb286754b570fdcc7 git Not specified
CNA Linux Linux affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 136b416593f1349cf6f72c8e3d18f0f204ee8545 git Not specified
CNA Linux Linux affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 a5b42c1e4ff2befaa6b96f7cbf32174751eba083 git Not specified
CNA Linux Linux affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 0853ac544c590880d797b04daa33fcb72b6be0e1 git Not specified
CNA Linux Linux affected 2.6.13 Not specified
CNA Linux Linux unaffected 2.6.13 semver Not specified
CNA Linux Linux unaffected 5.10.260 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.211 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.177 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.144 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.95 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.38 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.3 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/887f92ceccf3eacd5f2402db21254d66372fae00 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b2eb1ffd511d1b3c3e21122f97cbbccea411e277 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1e96239fddcefacf6afe6c498357be68eacbcabc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bd69a825485168ef74e815ecb286754b570fdcc7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/136b416593f1349cf6f72c8e3d18f0f204ee8545 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b94c4be77682aab06d65ca7296149e3bcfb37353 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0853ac544c590880d797b04daa33fcb72b6be0e1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a5b42c1e4ff2befaa6b96f7cbf32174751eba083 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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