{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43350","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-05-01T14:12:56.003Z","datePublished":"2026-05-08T13:41:53.276Z","dateUpdated":"2026-05-11T22:22:52.597Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T22:22:52.597Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: require a full NFS mode SID before reading mode bits\n\nparse_dacl() treats an ACE SID matching sid_unix_NFS_mode as an NFS\nmode SID and reads sid.sub_auth[2] to recover the mode bits.\n\nThat assumes the ACE carries three subauthorities, but compare_sids()\nonly compares min(a, b) subauthorities.  A malicious server can return\nan ACE with num_subauth = 2 and sub_auth[] = {88, 3}, which still\nmatches sid_unix_NFS_mode and then drives the sub_auth[2] read four\nbytes past the end of the ACE.\n\nRequire num_subauth >= 3 before treating the ACE as an NFS mode SID.\nThis keeps the fix local to the special-SID mode path without changing\ncompare_sids() semantics for the rest of cifsacl."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H","baseScore":7.6,"baseSeverity":"HIGH"}}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/cifsacl.c"],"versions":[{"version":"e2f8fbfb8d09c06decde162090fac3ee220aa280","lessThan":"b53b8e98c23310294fc45fc686db5ee860311896","status":"affected","versionType":"git"},{"version":"e2f8fbfb8d09c06decde162090fac3ee220aa280","lessThan":"c8eef12af1cc73031639ea7cf16e0b10e2536b0b","status":"affected","versionType":"git"},{"version":"e2f8fbfb8d09c06decde162090fac3ee220aa280","lessThan":"38a69f08ee82c450d3e4168707fff2e317dc3ff7","status":"affected","versionType":"git"},{"version":"e2f8fbfb8d09c06decde162090fac3ee220aa280","lessThan":"f8488c07bea2431ee12a6067d736578064fa46b4","status":"affected","versionType":"git"},{"version":"e2f8fbfb8d09c06decde162090fac3ee220aa280","lessThan":"2757ad3e4b6f9e0fed4c7739594e702abc5cab21","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/smb/client/cifsacl.c"],"versions":[{"version":"5.4","status":"affected"},{"version":"0","lessThan":"5.4","status":"unaffected","versionType":"semver"},{"version":"6.6.136","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.84","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.25","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.0.2","lessThanOrEqual":"7.0.*","status":"unaffected","versionType":"semver"},{"version":"7.1-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":"5.4","versionEndExcluding":"6.6.136"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"6.12.84"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"6.18.25"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"7.0.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"7.1-rc1"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/b53b8e98c23310294fc45fc686db5ee860311896"},{"url":"https://git.kernel.org/stable/c/c8eef12af1cc73031639ea7cf16e0b10e2536b0b"},{"url":"https://git.kernel.org/stable/c/38a69f08ee82c450d3e4168707fff2e317dc3ff7"},{"url":"https://git.kernel.org/stable/c/f8488c07bea2431ee12a6067d736578064fa46b4"},{"url":"https://git.kernel.org/stable/c/2757ad3e4b6f9e0fed4c7739594e702abc5cab21"}],"title":"smb: client: require a full NFS mode SID before reading mode bits","x_generator":{"engine":"bippy-1.2.0"}}}}