{"id":"CVE-2026-53397","revision":"d328273735494c259c6a57f0ef95216d","records":[{"revision":"d328273735494c259c6a57f0ef95216d","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-53397","aliases":[],"title":"nfsd: fix posix_acl leak on SETACL decode failure","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix posix_acl leak on SETACL decode failure\n\nnfsaclsvc_decode_setaclargs() and nfs3svc_decode_setaclargs() each\ncall nfs_stream_decode_acl() twice, first for NFS_ACL and then for\nNFS_DFACL.  Each successful call transfers ownership of a freshly\nallocated posix_acl into argp->acl_access or argp->acl_default.  If\nthe first call succeeds but the second fails, the decoder returns\nfalse and argp->acl_access is left dangling.\n\nACLPROC2_SETACL.pc_release was wired to nfssvc_release_attrstat and\nACLPROC3_SETACL.pc_release was wired to nfs3svc_release_fhandle.\nBoth only call fh_put() and have no knowledge of the ACL fields on\nargp.  The posix_acl_release() pairs sat at the out: labels inside\nnfsacld_proc_setacl() and nfsd3_proc_setacl(), but svc_process()\nskips pc_func when pc_decode returns false, so that cleanup is\nunreachable on decode failure:\n\n    svc_process_common()\n      pc_decode()                  /* decode_setaclargs: false */\n      /* pc_func skipped */\n      pc_release()                 /* fh_put only -- ACLs leaked */\n\nThe orphaned posix_acl is leaked for the lifetime of the server.\n\nFix by adding nfsaclsvc_release_setacl() and nfs3svc_release_setacl(),\nwhich release both argp->acl_access and argp->acl_default in addition\nto fh_put(), and wiring them as pc_release for their respective SETACL\nprocedures.  pc_release runs on every path svc_process() takes after\ndecode, including decode failure, so the posix_acl_release() pairs are\nremoved from the proc functions' out: labels to keep ownership in one\nplace.  This matches the existing release_getacl() pattern used by\nthe sibling GETACL procedures.","state":0,"publishedAt":"2026-07-19T12:01:58.938+00:00","modifiedAt":"2026-10-19T20:07:46.415+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"fs/nfsd/nfs2acl.c\",\n                        \"fs/nfsd/nfs3acl.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"a257cdd0e2179630d3201c32ba14d7fcb3c3a055\",\n                            \"lessThan\": \"b2eb1ffd511d1b3c3e21122f97cbbccea411e277\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a257cdd0e2179630d3201c32ba14d7fcb3c3a055\",\n                            \"lessThan\": \"b94c4be77682aab06d65ca7296149e3bcfb37353\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a257cdd0e2179630d3201c32ba14d7fcb3c3a055\",\n                            \"lessThan\": \"887f92ceccf3eacd5f2402db21254d66372fae00\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a257cdd0e2179630d3201c32ba14d7fcb3c3a055\",\n                            \"lessThan\": \"1e96239fddcefacf6afe6c498357be68eacbcabc\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a257cdd0e2179630d3201c32ba14d7fcb3c3a055\",\n                            \"lessThan\": \"bd69a825485168ef74e815ecb286754b570fdcc7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a257cdd0e2179630d3201c32ba14d7fcb3c3a055\",\n                            \"lessThan\": \"136b416593f1349cf6f72c8e3d18f0f204ee8545\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a257cdd0e2179630d3201c32ba14d7fcb3c3a055\",\n                            \"lessThan\": \"a5b42c1e4ff2befaa6b96f7cbf32174751eba083\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"a257cdd0e2179630d3201c32ba14d7fcb3c3a055\",\n                            \"lessThan\": \"0853ac544c590880d797b04daa33fcb72b6be0e1\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"fs/nfsd/nfs2acl.c\",\n                        \"fs/nfsd/nfs3acl.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.13\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.13\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.260\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.211\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.177\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.144\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.95\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.38\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.3\",\n                            \"lessThanOrEqual\": \"7.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/b2eb1ffd511d1b3c3e21122f97cbbccea411e277","https://git.kernel.org/stable/c/b94c4be77682aab06d65ca7296149e3bcfb37353","https://git.kernel.org/stable/c/887f92ceccf3eacd5f2402db21254d66372fae00","https://git.kernel.org/stable/c/1e96239fddcefacf6afe6c498357be68eacbcabc","https://git.kernel.org/stable/c/bd69a825485168ef74e815ecb286754b570fdcc7","https://git.kernel.org/stable/c/136b416593f1349cf6f72c8e3d18f0f204ee8545","https://git.kernel.org/stable/c/a5b42c1e4ff2befaa6b96f7cbf32174751eba083","https://git.kernel.org/stable/c/0853ac544c590880d797b04daa33fcb72b6be0e1"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-53397","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-53397","identifiers":["CVE-2026-53397"]},"retained":false,"historicalAffected":[]}],"coverage":[]}