{"api_version":"1","generated_at":"2026-05-03T12:44:39+00:00","cve":"CVE-2026-31694","urls":{"html":"https://cve.report/CVE-2026-31694","api":"https://cve.report/api/cve/CVE-2026-31694.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-31694","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-31694"},"summary":{"title":"fuse: reject oversized dirents in page cache","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nfuse: reject oversized dirents in page cache\n\nfuse_add_dirent_to_cache() computes a serialized dirent size from the\nserver-controlled namelen field and copies the dirent into a single\npage-cache page. The existing logic only checks whether the dirent fits\nin the remaining space of the current page and advances to a fresh page\nif not. It never checks whether the dirent itself exceeds PAGE_SIZE.\n\nAs a result, a malicious FUSE server can return a dirent with\nnamelen=4095, producing a serialized record size of 4120 bytes. On 4 KiB\npage systems this causes memcpy() to overflow the cache page by 24 bytes\ninto the following kernel page.\n\nReject dirents that cannot fit in a single page before copying them into\nthe readdir cache.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-01 14:16:19","updated_at":"2026-05-03 07:16:16"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/45c05af36311624c1148123caeb011312495d86b","name":"https://git.kernel.org/stable/c/45c05af36311624c1148123caeb011312495d86b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/51a8de6c50bf947c8f534cd73da4c8f0a13e7bed","name":"https://git.kernel.org/stable/c/51a8de6c50bf947c8f534cd73da4c8f0a13e7bed","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7de93abfaae1b2dc94da8a07a36421bd073f1d8f","name":"https://git.kernel.org/stable/c/7de93abfaae1b2dc94da8a07a36421bd073f1d8f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/474ce83c96a55f2eeb14dee2be375eeadfdacdf5","name":"https://git.kernel.org/stable/c/474ce83c96a55f2eeb14dee2be375eeadfdacdf5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d23ad78bfd205eac26766e38ba7d79f279131098","name":"https://git.kernel.org/stable/c/d23ad78bfd205eac26766e38ba7d79f279131098","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-31694","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31694","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 69e34551152a286f827d54dcb5700da6aeaac1fb d23ad78bfd205eac26766e38ba7d79f279131098 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 69e34551152a286f827d54dcb5700da6aeaac1fb 45c05af36311624c1148123caeb011312495d86b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 69e34551152a286f827d54dcb5700da6aeaac1fb 7de93abfaae1b2dc94da8a07a36421bd073f1d8f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 69e34551152a286f827d54dcb5700da6aeaac1fb 474ce83c96a55f2eeb14dee2be375eeadfdacdf5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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the Linux kernel, the following vulnerability has been resolved:\n\nfuse: reject oversized dirents in page cache\n\nfuse_add_dirent_to_cache() computes a serialized dirent size from the\nserver-controlled namelen field and copies the dirent into a single\npage-cache page. The existing logic only checks whether the dirent fits\nin the remaining space of the current page and advances to a fresh page\nif not. It never checks whether the dirent itself exceeds PAGE_SIZE.\n\nAs a result, a malicious FUSE server can return a dirent with\nnamelen=4095, producing a serialized record size of 4120 bytes. On 4 KiB\npage systems this causes memcpy() to overflow the cache page by 24 bytes\ninto the following kernel page.\n\nReject dirents that cannot fit in a single page before copying them into\nthe readdir cache."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-05-03T05:45:19.804Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/d23ad78bfd205eac26766e38ba7d79f279131098"},{"url":"https://git.kernel.org/stable/c/45c05af36311624c1148123caeb011312495d86b"},{"url":"https://git.kernel.org/stable/c/7de93abfaae1b2dc94da8a07a36421bd073f1d8f"},{"url":"https://git.kernel.org/stable/c/474ce83c96a55f2eeb14dee2be375eeadfdacdf5"},{"url":"https://git.kernel.org/stable/c/51a8de6c50bf947c8f534cd73da4c8f0a13e7bed"}],"title":"fuse: reject oversized dirents in page cache","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-31694","datePublished":"2026-05-01T13:53:36.048Z","dateReserved":"2026-03-09T15:48:24.131Z","dateUpdated":"2026-05-03T05:45:19.804Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-01 14:16:19","lastModifiedDate":"2026-05-03 07:16:16","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"31694","Ordinal":"1","Title":"fuse: reject oversized dirents in page cache","CVE":"CVE-2026-31694","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"31694","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nfuse: reject oversized dirents in page cache\n\nfuse_add_dirent_to_cache() computes a serialized dirent size from the\nserver-controlled namelen field and copies the dirent into a single\npage-cache page. The existing logic only checks whether the dirent fits\nin the remaining space of the current page and advances to a fresh page\nif not. It never checks whether the dirent itself exceeds PAGE_SIZE.\n\nAs a result, a malicious FUSE server can return a dirent with\nnamelen=4095, producing a serialized record size of 4120 bytes. On 4 KiB\npage systems this causes memcpy() to overflow the cache page by 24 bytes\ninto the following kernel page.\n\nReject dirents that cannot fit in a single page before copying them into\nthe readdir cache.","Type":"Description","Title":"fuse: reject oversized dirents in page cache"}]}}}