nfsd: fix posix_acl leak on SETACL decode failure
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'
CVE-2026-53397
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-53397
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "a257cdd0e2179630d3201c32ba14d7fcb3c3a055",
"lessThan": "b2eb1ffd511d1b3c3e21122f97cbbccea411e277",
"versionType": "git"
},
{
"status": "affected",
"version": "a257cdd0e2179630d3201c32ba14d7fcb3c3a055",
"lessThan": "b94c4be77682aab06d65ca7296149e3bcfb37353",
"versionType": "git"
},
{
"status": "affected",
"version": "a257cdd0e2179630d3201c32ba14d7fcb3c3a055",
"lessThan": "887f92ceccf3eacd5f2402db21254d66372fae00",
"versionType": "git"
},
{
"status": "affected",
"version": "a257cdd0e2179630d3201c32ba14d7fcb3c3a055",
"lessThan": "1e96239fddcefacf6afe6c498357be68eacbcabc",
"versionType": "git"
},
{
"status": "affected",
"version": "a257cdd0e2179630d3201c32ba14d7fcb3c3a055",
"lessThan": "bd69a825485168ef74e815ecb286754b570fdcc7",
"versionType": "git"
},
{
"status": "affected",
"version": "a257cdd0e2179630d3201c32ba14d7fcb3c3a055",
"lessThan": "136b416593f1349cf6f72c8e3d18f0f204ee8545",
"versionType": "git"
},
{
"status": "affected",
"version": "a257cdd0e2179630d3201c32ba14d7fcb3c3a055",
"lessThan": "a5b42c1e4ff2befaa6b96f7cbf32174751eba083",
"versionType": "git"
},
{
"status": "affected",
"version": "a257cdd0e2179630d3201c32ba14d7fcb3c3a055",
"lessThan": "0853ac544c590880d797b04daa33fcb72b6be0e1",
"versionType": "git"
}
],
"programFiles": [
"fs/nfsd/nfs2acl.c",
"fs/nfsd/nfs3acl.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.13"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.13",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.260",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.211",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.177",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.144",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.95",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.38",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.3",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/nfsd/nfs2acl.c",
"fs/nfsd/nfs3acl.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-53397
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40824 · Revision 1
- Added to Heist Feed
- Publisher date