{"id":"CVE-2026-31705","revision":null,"records":[{"revision":"7ea0068037754d8eb578c8ee940aaadc","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-31705","aliases":[],"title":"ksmbd: fix out-of-bounds write in smb2_get_ea() EA alignment","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix out-of-bounds write in smb2_get_ea() EA alignment\n\nsmb2_get_ea() applies 4-byte alignment padding via memset() after\nwriting each EA entry. The bounds check on buf_free_len is performed\nbefore the value memcpy, but the alignment memset fires unconditionally\nafterward with no check on remaining space.\n\nWhen the EA value exactly fills the remaining buffer (buf_free_len == 0\nafter value subtraction), the alignment memset writes 1-3 NUL bytes\npast the buf_free_len boundary. In compound requests where the response\nbuffer is shared across commands, the first command (e.g., READ) can\nconsume most of the buffer, leaving a tight remainder for the QUERY_INFO\nEA response. The alignment memset then overwrites past the physical\nkvmalloc allocation into adjacent kernel heap memory.\n\nAdd a bounds check before the alignment memset to ensure buf_free_len\ncan accommodate the padding bytes.\n\nThis is the same bug pattern fixed by commit beef2634f81f (\"ksmbd: fix\npotencial OOB in get_file_all_info() for compound requests\") and\ncommit fda9522ed6af (\"ksmbd: fix OOB write in QUERY_INFO for compound\nrequests\"), both of which added bounds checks before unconditional\nwrites in QUERY_INFO response handlers.","state":0,"publishedAt":"2026-05-01T13:56:03.896+00:00","modifiedAt":"2026-10-15T01:18:03.133+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/server/smb2pdu.c\"\n ],\n \"versions\": [\n {\n \"version\": \"9f297df20d93411c0b4ddad7f88ba04a7cd36e77\",\n \"lessThan\": \"ddbbc8b2a09dd2cfed90871313e3691ae1db08a2\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d\",\n \"lessThan\": \"ffbce350c6fd1e99116ea57383b9031717e36d3b\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d\",\n \"lessThan\": \"98f3de6ef4efbd899348d333f0902dc4ff14380c\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d\",\n \"lessThan\": \"790304c02bf9bd7b8171feda4294d6e62d32ae8f\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d\",\n \"lessThan\": \"922d48fe8c19f388ffa2f709f33acaae4e408de2\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d\",\n \"lessThan\": \"30010c952077a1c89ecdd71fc4d574c75a8f5617\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"f2283680a80571ca82d710bc6ecd8f8beac67d63\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"6.1.71\",\n \"lessThan\": \"6.1.175\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.145\",\n \"lessThan\": \"5.16\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\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/server/smb2pdu.c\"\n ],\n \"versions\": [\n {\n \"version\": \"6.6\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"6.6\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.175\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.136\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.84\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.25\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.0.2\",\n \"lessThanOrEqual\": \"7.0.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1\",\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:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/ddbbc8b2a09dd2cfed90871313e3691ae1db08a2","https://git.kernel.org/stable/c/ffbce350c6fd1e99116ea57383b9031717e36d3b","https://git.kernel.org/stable/c/98f3de6ef4efbd899348d333f0902dc4ff14380c","https://git.kernel.org/stable/c/790304c02bf9bd7b8171feda4294d6e62d32ae8f","https://git.kernel.org/stable/c/922d48fe8c19f388ffa2f709f33acaae4e408de2","https://git.kernel.org/stable/c/30010c952077a1c89ecdd71fc4d574c75a8f5617"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-31705","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-31705","identifiers":["CVE-2026-31705"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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