{"api_version":"1","generated_at":"2026-07-23T12:32:25+00:00","cve":"CVE-2026-53397","urls":{"html":"https://cve.report/CVE-2026-53397","api":"https://cve.report/api/cve/CVE-2026-53397.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-53397","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-53397"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 12:16:50","updated_at":"2026-07-20 15:16:42"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","data":{"baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/887f92ceccf3eacd5f2402db21254d66372fae00","name":"https://git.kernel.org/stable/c/887f92ceccf3eacd5f2402db21254d66372fae00","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b2eb1ffd511d1b3c3e21122f97cbbccea411e277","name":"https://git.kernel.org/stable/c/b2eb1ffd511d1b3c3e21122f97cbbccea411e277","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1e96239fddcefacf6afe6c498357be68eacbcabc","name":"https://git.kernel.org/stable/c/1e96239fddcefacf6afe6c498357be68eacbcabc","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/bd69a825485168ef74e815ecb286754b570fdcc7","name":"https://git.kernel.org/stable/c/bd69a825485168ef74e815ecb286754b570fdcc7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/136b416593f1349cf6f72c8e3d18f0f204ee8545","name":"https://git.kernel.org/stable/c/136b416593f1349cf6f72c8e3d18f0f204ee8545","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b94c4be77682aab06d65ca7296149e3bcfb37353","name":"https://git.kernel.org/stable/c/b94c4be77682aab06d65ca7296149e3bcfb37353","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0853ac544c590880d797b04daa33fcb72b6be0e1","name":"https://git.kernel.org/stable/c/0853ac544c590880d797b04daa33fcb72b6be0e1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a5b42c1e4ff2befaa6b96f7cbf32174751eba083","name":"https://git.kernel.org/stable/c/a5b42c1e4ff2befaa6b96f7cbf32174751eba083","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-53397","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53397","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 b2eb1ffd511d1b3c3e21122f97cbbccea411e277 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 b94c4be77682aab06d65ca7296149e3bcfb37353 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 887f92ceccf3eacd5f2402db21254d66372fae00 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 1e96239fddcefacf6afe6c498357be68eacbcabc git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 bd69a825485168ef74e815ecb286754b570fdcc7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 136b416593f1349cf6f72c8e3d18f0f204ee8545 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 a5b42c1e4ff2befaa6b96f7cbf32174751eba083 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected a257cdd0e2179630d3201c32ba14d7fcb3c3a055 0853ac544c590880d797b04daa33fcb72b6be0e1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 2.6.13","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 2.6.13 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.260 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.211 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.177 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.144 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.95 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.38 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.3 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"53397","cve":"CVE-2026-53397","epss":"0.001770000","percentile":"0.074140000","score_date":"2026-07-20","updated_at":"2026-07-21 00:13:14"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/nfsd/nfs2acl.c","fs/nfsd/nfs3acl.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"b2eb1ffd511d1b3c3e21122f97cbbccea411e277","status":"affected","version":"a257cdd0e2179630d3201c32ba14d7fcb3c3a055","versionType":"git"},{"lessThan":"b94c4be77682aab06d65ca7296149e3bcfb37353","status":"affected","version":"a257cdd0e2179630d3201c32ba14d7fcb3c3a055","versionType":"git"},{"lessThan":"887f92ceccf3eacd5f2402db21254d66372fae00","status":"affected","version":"a257cdd0e2179630d3201c32ba14d7fcb3c3a055","versionType":"git"},{"lessThan":"1e96239fddcefacf6afe6c498357be68eacbcabc","status":"affected","version":"a257cdd0e2179630d3201c32ba14d7fcb3c3a055","versionType":"git"},{"lessThan":"bd69a825485168ef74e815ecb286754b570fdcc7","status":"affected","version":"a257cdd0e2179630d3201c32ba14d7fcb3c3a055","versionType":"git"},{"lessThan":"136b416593f1349cf6f72c8e3d18f0f204ee8545","status":"affected","version":"a257cdd0e2179630d3201c32ba14d7fcb3c3a055","versionType":"git"},{"lessThan":"a5b42c1e4ff2befaa6b96f7cbf32174751eba083","status":"affected","version":"a257cdd0e2179630d3201c32ba14d7fcb3c3a055","versionType":"git"},{"lessThan":"0853ac544c590880d797b04daa33fcb72b6be0e1","status":"affected","version":"a257cdd0e2179630d3201c32ba14d7fcb3c3a055","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/nfsd/nfs2acl.c","fs/nfsd/nfs3acl.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"2.6.13"},{"lessThan":"2.6.13","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.260","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.211","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.177","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.144","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.95","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.38","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.3","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.260","versionStartIncluding":"2.6.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.211","versionStartIncluding":"2.6.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.177","versionStartIncluding":"2.6.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.144","versionStartIncluding":"2.6.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.95","versionStartIncluding":"2.6.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.38","versionStartIncluding":"2.6.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.3","versionStartIncluding":"2.6.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc1","versionStartIncluding":"2.6.13","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"metrics":[{"cvssV3_1":{"baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-07-20T13:39:59.694Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/b2eb1ffd511d1b3c3e21122f97cbbccea411e277"},{"url":"https://git.kernel.org/stable/c/b94c4be77682aab06d65ca7296149e3bcfb37353"},{"url":"https://git.kernel.org/stable/c/887f92ceccf3eacd5f2402db21254d66372fae00"},{"url":"https://git.kernel.org/stable/c/1e96239fddcefacf6afe6c498357be68eacbcabc"},{"url":"https://git.kernel.org/stable/c/bd69a825485168ef74e815ecb286754b570fdcc7"},{"url":"https://git.kernel.org/stable/c/136b416593f1349cf6f72c8e3d18f0f204ee8545"},{"url":"https://git.kernel.org/stable/c/a5b42c1e4ff2befaa6b96f7cbf32174751eba083"},{"url":"https://git.kernel.org/stable/c/0853ac544c590880d797b04daa33fcb72b6be0e1"}],"title":"nfsd: fix posix_acl leak on SETACL decode failure","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-53397","datePublished":"2026-07-19T12:01:58.938Z","dateReserved":"2026-06-09T07:44:35.402Z","dateUpdated":"2026-07-20T13:39:59.694Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-19 12:16:50","lastModifiedDate":"2026-07-20 15:16:42","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"53397","Ordinal":"1","Title":"nfsd: fix posix_acl leak on SETACL decode failure","CVE":"CVE-2026-53397","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"53397","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"nfsd: fix posix_acl leak on SETACL decode failure"}]}}}