{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89671", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.746Z", "datePublished": "2026-09-11T19:45:56.604Z", "dateUpdated": "2026-09-11T19:45:56.604Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-11T19:45:56.604Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: gate nfs3 setacl by argp->mask\n\nnfsd3_proc_setacl() calls set_posix_acl() unconditionally for both\nACL_TYPE_ACCESS and ACL_TYPE_DEFAULT, passing argp->acl_access and\nargp->acl_default verbatim. The NFSv3 ACL decoder only populates\nthose pointers when the corresponding mask bit is set:\n\n nfs3svc_decode_setaclargs()\n if (args->mask & NFS_ACL) decode into acl_access\n if (args->mask & NFS_DFACL) decode into acl_default\n /* otherwise the pointer stays NULL (pc_argzero) */\n\n nfsd3_proc_setacl()\n set_posix_acl(.., ACL_TYPE_ACCESS, argp->acl_access)\n set_posix_acl(.., ACL_TYPE_DEFAULT, argp->acl_default)\n\nset_posix_acl(idmap, dentry, type, NULL) is the VFS \"remove this\nACL type\" operation. A NULL pointer that means \"the client did not\nsend this arm\" is therefore indistinguishable from \"the client\nasked to remove this ACL\". A SETACL with mask=NFS_ACL silently\ndrops the directory's default ACL; mask=0 drops both.\n\nThe sibling nfsd3_proc_getacl() already consults argp->mask before\ntouching each arm; mirror that in setacl.\n\nFix by wrapping each set_posix_acl() call in the matching mask bit\ncheck and initializing error to 0 before inode_lock so that a\nrequest with neither bit set leaves the on-disk ACLs untouched and\nreturns nfs_ok. The out_drop_lock path and the unconditional\nposix_acl_release() at out: are preserved; both NULL-tolerate the\nskipped arms."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/nfsd/nfs3acl.c"], "versions": [{"version": "a257cdd0e2179630d3201c32ba14d7fcb3c3a055", "lessThan": "68a80b26efdff1d09f8ae1773c6a915abb9e191d", "status": "affected", "versionType": "git"}, {"version": "a257cdd0e2179630d3201c32ba14d7fcb3c3a055", "lessThan": "b3bff820d068ea59767d4e91a3258231a879da5f", "status": "affected", "versionType": "git"}, {"version": "a257cdd0e2179630d3201c32ba14d7fcb3c3a055", "lessThan": "ff99ed007f065198fd723152405c22aa558f700b", "status": "affected", "versionType": "git"}, {"version": "a257cdd0e2179630d3201c32ba14d7fcb3c3a055", "lessThan": "453d7198a0ab07a12d46e0575861ac7b932da17e", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/nfsd/nfs3acl.c"], "versions": [{"version": "2.6.13", "status": "affected"}, {"version": "0", "lessThan": "2.6.13", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-rc1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "7.3-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/68a80b26efdff1d09f8ae1773c6a915abb9e191d"}, {"url": "https://git.kernel.org/stable/c/b3bff820d068ea59767d4e91a3258231a879da5f"}, {"url": "https://git.kernel.org/stable/c/ff99ed007f065198fd723152405c22aa558f700b"}, {"url": "https://git.kernel.org/stable/c/453d7198a0ab07a12d46e0575861ac7b932da17e"}], "title": "nfsd: gate nfs3 setacl by argp->mask", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/nfsd/nfs3acl.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "68a80b26efdff1d09f8ae1773c6a915abb9e191d", "status": "affected", "version": "a257cdd0e2179630d3201c32ba14d7fcb3c3a055", "versionType": "git"}, {"lessThan": "b3bff820d068ea59767d4e91a3258231a879da5f", "status": "affected", "version": "a257cdd0e2179630d3201c32ba14d7fcb3c3a055", "versionType": "git"}, {"lessThan": "ff99ed007f065198fd723152405c22aa558f700b", "status": "affected", "version": "a257cdd0e2179630d3201c32ba14d7fcb3c3a055", "versionType": "git"}, {"lessThan": "453d7198a0ab07a12d46e0575861ac7b932da17e", "status": "affected", "version": "a257cdd0e2179630d3201c32ba14d7fcb3c3a055", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["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": "6.12.*", "status": "unaffected", "version": "6.12.109", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3-rc1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: gate nfs3 setacl by argp->mask\n\nnfsd3_proc_setacl() calls set_posix_acl() unconditionally for both\nACL_TYPE_ACCESS and ACL_TYPE_DEFAULT, passing argp->acl_access and\nargp->acl_default verbatim. The NFSv3 ACL decoder only populates\nthose pointers when the corresponding mask bit is set:\n\n nfs3svc_decode_setaclargs()\n if (args->mask & NFS_ACL) decode into acl_access\n if (args->mask & NFS_DFACL) decode into acl_default\n /* otherwise the pointer stays NULL (pc_argzero) */\n\n nfsd3_proc_setacl()\n set_posix_acl(.., ACL_TYPE_ACCESS, argp->acl_access)\n set_posix_acl(.., ACL_TYPE_DEFAULT, argp->acl_default)\n\nset_posix_acl(idmap, dentry, type, NULL) is the VFS \"remove this\nACL type\" operation. A NULL pointer that means \"the client did not\nsend this arm\" is therefore indistinguishable from \"the client\nasked to remove this ACL\". A SETACL with mask=NFS_ACL silently\ndrops the directory's default ACL; mask=0 drops both.\n\nThe sibling nfsd3_proc_getacl() already consults argp->mask before\ntouching each arm; mirror that in setacl.\n\nFix by wrapping each set_posix_acl() call in the matching mask bit\ncheck and initializing error to 0 before inode_lock so that a\nrequest with neither bit set leaves the on-disk ACLs untouched and\nreturns nfs_ok. The out_drop_lock path and the unconditional\nposix_acl_release() at out: are preserved; both NULL-tolerate the\nskipped arms."}], "id": "CVE-2026-89671", "lastModified": "2026-09-11T20:19:53.647", "metrics": {}, "published": "2026-09-11T20:19:53.647", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/453d7198a0ab07a12d46e0575861ac7b932da17e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/68a80b26efdff1d09f8ae1773c6a915abb9e191d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b3bff820d068ea59767d4e91a3258231a879da5f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ff99ed007f065198fd723152405c22aa558f700b"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: NFSv3 `nfsd` allows unauthorized ACL removal via crafted SETACL requests.", "id": "2532394", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532394"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H", "status": "draft"}, "cwe": "CWE-115", "details": ["A flaw was found in the Linux kernel's Network File System version 3 (NFSv3) server daemon (`nfsd`). The `nfsd3_proc_setacl()` function unconditionally processes Access Control List (ACL) update requests, even when the client's request does not specify an ACL to be set. A remote attacker could exploit this by sending a crafted `SETACL` request, leading to the unintended removal of a directory's default ACL or both access and default ACLs. This could result in unauthorized changes to file system permissions."], "name": "CVE-2026-89671", "public_date": "2026-09-11T19:45:56Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89671\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89671\nhttps://git.kernel.org/stable/c/453d7198a0ab07a12d46e0575861ac7b932da17e\nhttps://git.kernel.org/stable/c/68a80b26efdff1d09f8ae1773c6a915abb9e191d\nhttps://git.kernel.org/stable/c/b3bff820d068ea59767d4e91a3258231a879da5f\nhttps://git.kernel.org/stable/c/ff99ed007f065198fd723152405c22aa558f700b"], "threat_severity": "Moderate"}

{"created": "2026-09-12T09:30:13.016240+00:00", "updated": "2026-09-12T15:30:16.635828+00:00", "vendors": []}