{"id":"CVE-2026-64298","revision":null,"records":[{"revision":"bb449888bd424ae4ac01a47d3c4a107c","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-64298","aliases":[],"title":"NFSv4: include MAY_WRITE in open permission mask for O_TRUNC","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nNFSv4: include MAY_WRITE in open permission mask for O_TRUNC\n\nPOSIX requires write permission to truncate a file, so an open() that\nspecifies O_TRUNC must be authorized for write access regardless of the\nO_ACCMODE access mode.\n\nnfs_open_permission_mask() builds the access mask passed to\nnfs_may_open(), which is the local authorization gate for OPENs the\nclient serves itself from a cached write delegation via the\ncan_open_delegated() path in nfs4_try_open_cached(). The mask is\nderived from O_ACCMODE alone, so an open(O_RDONLY | O_TRUNC) against a\nfile the caller cannot write requests only MAY_READ and passes the\nlocal check. The OPEN is then satisfied locally and the truncation is\nissued to the server as a SETATTR(size=0) over the delegation stateid,\nwhich the server accepts under standard write-delegation semantics.\nPOSIX requires that this open fail with EACCES.\n\nInclude MAY_WRITE in the mask whenever O_TRUNC is set so the local\ncheck matches the access the server would have enforced.","state":0,"publishedAt":"2026-07-25T08:49:35.101+00:00","modifiedAt":"2026-10-19T20:38:22.558+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/nfs/dir.c\"\n ],\n \"versions\": [\n {\n \"version\": \"af22f94ae02ab9dd4fd7fe628c8434a59cc293be\",\n \"lessThan\": \"4817c8974315b666e895b7d1bb83cd3664c323b1\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"af22f94ae02ab9dd4fd7fe628c8434a59cc293be\",\n \"lessThan\": \"cb148a2762d644bff1894728e8835a9a4b84f9ea\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"af22f94ae02ab9dd4fd7fe628c8434a59cc293be\",\n \"lessThan\": \"30fdf4df6c3c00efec947e4ddf97f0fdd4473628\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"af22f94ae02ab9dd4fd7fe628c8434a59cc293be\",\n \"lessThan\": \"22c1fd1355ad4ca27aa7f0fa02719122dd92d9de\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"af22f94ae02ab9dd4fd7fe628c8434a59cc293be\",\n \"lessThan\": \"6bd7d0a06b53c4e797e1a9cea0d2d41aa1b26230\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"af22f94ae02ab9dd4fd7fe628c8434a59cc293be\",\n \"lessThan\": \"a937e92c1d00534b5c2e3e9f4381b7e988180797\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"af22f94ae02ab9dd4fd7fe628c8434a59cc293be\",\n \"lessThan\": \"e36501b7d4abdcd6d69a7cb901b2f286b7a3d041\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"af22f94ae02ab9dd4fd7fe628c8434a59cc293be\",\n \"lessThan\": \"5140f099ecd8a2f2808b7f7b720ee1bad8468974\",\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/nfs/dir.c\"\n ],\n \"versions\": [\n {\n \"version\": \"2.6.24\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"2.6.24\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.261\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.212\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.178\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.145\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.96\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.39\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1.4\",\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:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","score":7.1,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/4817c8974315b666e895b7d1bb83cd3664c323b1","https://git.kernel.org/stable/c/cb148a2762d644bff1894728e8835a9a4b84f9ea","https://git.kernel.org/stable/c/30fdf4df6c3c00efec947e4ddf97f0fdd4473628","https://git.kernel.org/stable/c/22c1fd1355ad4ca27aa7f0fa02719122dd92d9de","https://git.kernel.org/stable/c/6bd7d0a06b53c4e797e1a9cea0d2d41aa1b26230","https://git.kernel.org/stable/c/a937e92c1d00534b5c2e3e9f4381b7e988180797","https://git.kernel.org/stable/c/e36501b7d4abdcd6d69a7cb901b2f286b7a3d041","https://git.kernel.org/stable/c/5140f099ecd8a2f2808b7f7b720ee1bad8468974"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64298","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-64298","identifiers":["CVE-2026-64298"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-db1b57b5c8cf41498e207884b3f1235b","complete":true,"records":13654,"lastAttemptAt":"2026-11-08T18:47:45.2749951+00:00","lastSuccessAt":"2026-11-08T17:47:46.718+00:00","error":null,"lastVerifiedAt":"2026-11-08T17:47:46.718+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13706,"expectedIdentifiers":13706,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-08T18:47:41.4173610+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-08T18:47:41.417361+00:00","lastSuccessAt":"2026-11-08T18:47:41.7296264+00:00","error":null,"lastVerifiedAt":"2026-11-08T18:47:41.7296273+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. 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