{"id":"CVE-2026-53397","summary":"nfsd: fix posix_acl leak on SETACL decode failure","details":"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-\u003eacl_access or argp-\u003eacl_default.  If\nthe first call succeeds but the second fails, the decoder returns\nfalse and argp-\u003eacl_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-\u003eacl_access and argp-\u003eacl_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.","modified":"2026-07-23T09:59:48.947604840Z","published":"2026-07-19T12:01:58.938Z","related":["openSUSE-SU-2026:11339-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53397.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0853ac544c590880d797b04daa33fcb72b6be0e1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/136b416593f1349cf6f72c8e3d18f0f204ee8545"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1e96239fddcefacf6afe6c498357be68eacbcabc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/887f92ceccf3eacd5f2402db21254d66372fae00"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a5b42c1e4ff2befaa6b96f7cbf32174751eba083"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b2eb1ffd511d1b3c3e21122f97cbbccea411e277"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b94c4be77682aab06d65ca7296149e3bcfb37353"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bd69a825485168ef74e815ecb286754b570fdcc7"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53397.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53397"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"a257cdd0e2179630d3201c32ba14d7fcb3c3a055"},{"fixed":"b2eb1ffd511d1b3c3e21122f97cbbccea411e277"},{"fixed":"b94c4be77682aab06d65ca7296149e3bcfb37353"},{"fixed":"887f92ceccf3eacd5f2402db21254d66372fae00"},{"fixed":"1e96239fddcefacf6afe6c498357be68eacbcabc"},{"fixed":"bd69a825485168ef74e815ecb286754b570fdcc7"},{"fixed":"136b416593f1349cf6f72c8e3d18f0f204ee8545"},{"fixed":"a5b42c1e4ff2befaa6b96f7cbf32174751eba083"},{"fixed":"0853ac544c590880d797b04daa33fcb72b6be0e1"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53397.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.13"},{"fixed":"5.10.260"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.211"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.177"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.144"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.95"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.38"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.3"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53397.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}