{"id":"CVE-2026-64380","revision":"4b75145d1a6f4c9ca2ca9ee2364e7fc7","records":[{"revision":"4b75145d1a6f4c9ca2ca9ee2364e7fc7","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-64380","aliases":[],"title":"smb: client: harden POSIX SID length parsing","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: harden POSIX SID length parsing\n\nposix_info_sid_size() reads sid[1] to obtain the subauthority count,\nbut its existing boundary check still accepts buffers with only one\nremaining byte. Require two bytes before reading sid[1] so all client\npaths that reuse the helper reject truncated POSIX SIDs safely.","state":0,"publishedAt":"2026-07-25T08:50:30.476+00:00","modifiedAt":"2026-10-19T20:38:25.851+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/smb/client/smb2pdu.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"349e13ad30b45998bb9937cfe0b32be6f951976d\",\n                            \"lessThan\": \"171605aed68380c2fa75dff9b3a1ed427c50065b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"349e13ad30b45998bb9937cfe0b32be6f951976d\",\n                            \"lessThan\": \"4213c1208978483021d7d125c131de3985d38f61\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"349e13ad30b45998bb9937cfe0b32be6f951976d\",\n                            \"lessThan\": \"96e889bc1e759c83f25093e8c2f3da31b4973f30\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"349e13ad30b45998bb9937cfe0b32be6f951976d\",\n                            \"lessThan\": \"0de5b8e76847f5de26f364a82c6602c4881c30da\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"349e13ad30b45998bb9937cfe0b32be6f951976d\",\n                            \"lessThan\": \"427eb7eb46425fec845a43e861f3d6e2899cae59\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"349e13ad30b45998bb9937cfe0b32be6f951976d\",\n                            \"lessThan\": \"86c5d470f5d42e61123b2f4b4f0b91f4eee5b980\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"349e13ad30b45998bb9937cfe0b32be6f951976d\",\n                            \"lessThan\": \"46a84715a015cb48e1b9c219dc88c03d8a541ea4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"349e13ad30b45998bb9937cfe0b32be6f951976d\",\n                            \"lessThan\": \"7ad2bcf2441430bb2e918fb3ef9a90d775a6e422\",\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/smb/client/smb2pdu.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.7\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.7\",\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:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H","score":8.2,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/171605aed68380c2fa75dff9b3a1ed427c50065b","https://git.kernel.org/stable/c/4213c1208978483021d7d125c131de3985d38f61","https://git.kernel.org/stable/c/96e889bc1e759c83f25093e8c2f3da31b4973f30","https://git.kernel.org/stable/c/0de5b8e76847f5de26f364a82c6602c4881c30da","https://git.kernel.org/stable/c/427eb7eb46425fec845a43e861f3d6e2899cae59","https://git.kernel.org/stable/c/86c5d470f5d42e61123b2f4b4f0b91f4eee5b980","https://git.kernel.org/stable/c/46a84715a015cb48e1b9c219dc88c03d8a541ea4","https://git.kernel.org/stable/c/7ad2bcf2441430bb2e918fb3ef9a90d775a6e422"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64380","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-64380","identifiers":["CVE-2026-64380"]},"retained":false,"historicalAffected":[]}],"coverage":[]}