Answer in brief
CVE-2026-53397 records a High severity (CVSS 7.5) vulnerability in nfsd: fix posix_acl leak on SETACL decode failure. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=a257cdd0e2179630d3201c32ba14d7fcb3c3a055 <b2eb1ffd511d1b3c3e21122f97cbbccea411e277 || >=a257cdd0e2179630d3201c32ba14d7fcb3c3a055 <b94c4be77682aab06d65ca7296149e3bcfb37353 || >=a257cdd0e2179630d3201c32ba14d7fcb3c3a055 <887f92ceccf3eacd5f2402db21254d66372fae00 || >=a257cdd0e2179630d3201c32ba14d7fcb3c3a055 <1e96239fddcefacf6afe6c498357be68eacbcabc || >=a257cdd0e2179630d3201c32ba14d7fcb3c3a055 <bd69a825485168ef74e815ecb286754b570fdcc7 || >=a257cdd0e2179630d3201c32ba14d7fcb3c3a055 <136b416593f1349cf6f72c8e3d18f0f204ee8545 || >=a257cdd0e2179630d3201c32ba14d7fcb3c3a055 <a5b42c1e4ff2befaa6b96f7cbf32174751eba083 || >=a257cdd0e2179630d3201c32ba14d7fcb3c3a055 <0853ac544c590880d797b04daa33fcb72b6be0e1 | b2eb1ffd511d1b3c3e21122f97cbbccea411e277, b94c4be77682aab06d65ca7296149e3bcfb37353, 887f92ceccf3eacd5f2402db21254d66372fae00, 1e96239fddcefacf6afe6c498357be68eacbcabc, bd69a825485168ef74e815ecb286754b570fdcc7, 136b416593f1349cf6f72c8e3d18f0f204ee8545, a5b42c1e4ff2befaa6b96f7cbf32174751eba083, 0853ac544c590880d797b04daa33fcb72b6be0e1 |
| Linux/Linuxgeneric | 2.6.13 | Not reported |
Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.