{"id":"CVE-2026-99114","state":"PUBLISHED","title":"ksmbd: initialize FileSystemControlFlags in FS_CONTROL_INFORMATION","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: initialize FileSystemControlFlags in FS_CONTROL_INFORMATION\n\nsmb2_get_info_filesystem() reports 48 bytes for FS_CONTROL_INFORMATION,\nthat is the whole of struct smb2_fs_control_info, but never assigns\nFileSystemControlFlags.  Those four bytes go to the client as they are\nfound in the response buffer.\n\nThe buffer is zeroed on allocation, so a standalone request leaks\nnothing.  A compound request can leak: the offset of the next response\nis advanced by the length pinned for the previous one, so a reply that\nwas written into the buffer and then dropped in favour of the short\nerror response of smb2_set_err_rsp() stays there, and the next reply is\nlaid over it with only the header cleared.\n\nksmbd does not implement quota tracking, so report no control flags.","publishedAt":"2026-10-28T10:34:31.576Z","updatedAt":"2026-10-30T12:41:52.446Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9","status":"affected","lessThan":"995456b5e703e128904a6cbc8b3347eb3d04c72c","versionType":"git"},{"version":"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9","status":"affected","lessThan":"c78aea8984c84767e87f677477e4784deb8adfde","versionType":"git"},{"version":"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9","status":"affected","lessThan":"e8b82184a1982894820a91a72ac9857ddd5dffbf","versionType":"git"},{"version":"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9","status":"affected","lessThan":"370459776468fc68c97008360108f381e3120953","versionType":"git"},{"version":"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9","status":"affected","lessThan":"d8c450ad0d08980b39b08d435efa921086c8b227","versionType":"git"},{"version":"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9","status":"affected","lessThan":"03bb4338c3a7c3fc4decf699a35753f0891aab2a","versionType":"git"},{"version":"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9","status":"affected","lessThan":"c0cd3fc6824122014da2b3b0cb7ddeaa2946ec8e","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/server/smb2pdu.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.161","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.115","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.59","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.13","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/server/smb2pdu.c"]}],"references":["https://git.kernel.org/stable/c/995456b5e703e128904a6cbc8b3347eb3d04c72c","https://git.kernel.org/stable/c/c78aea8984c84767e87f677477e4784deb8adfde","https://git.kernel.org/stable/c/e8b82184a1982894820a91a72ac9857ddd5dffbf","https://git.kernel.org/stable/c/370459776468fc68c97008360108f381e3120953","https://git.kernel.org/stable/c/d8c450ad0d08980b39b08d435efa921086c8b227","https://git.kernel.org/stable/c/03bb4338c3a7c3fc4decf699a35753f0891aab2a","https://git.kernel.org/stable/c/c0cd3fc6824122014da2b3b0cb7ddeaa2946ec8e"],"weaknesses":[],"ingestedAt":"2026-10-30T13:02:04.640Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/99xxx/CVE-2026-99114.json","commit":"cb14bf1b43b0c9f05f7f40eae2246263fd430780","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-99114","state":"PUBLISHED","datePublished":"2026-10-28T10:34:31.576Z","dateUpdated":"2026-10-30T12:41:52.446Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.392Z"},"containers":{"cna":{"title":"ksmbd: initialize FileSystemControlFlags in FS_CONTROL_INFORMATION","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: initialize FileSystemControlFlags in FS_CONTROL_INFORMATION\n\nsmb2_get_info_filesystem() reports 48 bytes for FS_CONTROL_INFORMATION,\nthat is the whole of struct smb2_fs_control_info, but never assigns\nFileSystemControlFlags.  Those four bytes go to the client as they are\nfound in the response buffer.\n\nThe buffer is zeroed on allocation, so a standalone request leaks\nnothing.  A compound request can leak: the offset of the next response\nis advanced by the length pinned for the previous one, so a reply that\nwas written into the buffer and then dropped in favour of the short\nerror response of smb2_set_err_rsp() stays there, and the next reply is\nlaid over it with only the header cleared.\n\nksmbd does not implement quota tracking, so report no control flags."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9","status":"affected","lessThan":"995456b5e703e128904a6cbc8b3347eb3d04c72c","versionType":"git"},{"version":"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9","status":"affected","lessThan":"c78aea8984c84767e87f677477e4784deb8adfde","versionType":"git"},{"version":"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9","status":"affected","lessThan":"e8b82184a1982894820a91a72ac9857ddd5dffbf","versionType":"git"},{"version":"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9","status":"affected","lessThan":"370459776468fc68c97008360108f381e3120953","versionType":"git"},{"version":"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9","status":"affected","lessThan":"d8c450ad0d08980b39b08d435efa921086c8b227","versionType":"git"},{"version":"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9","status":"affected","lessThan":"03bb4338c3a7c3fc4decf699a35753f0891aab2a","versionType":"git"},{"version":"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9","status":"affected","lessThan":"c0cd3fc6824122014da2b3b0cb7ddeaa2946ec8e","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/server/smb2pdu.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.161","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.115","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.59","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.13","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/server/smb2pdu.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/995456b5e703e128904a6cbc8b3347eb3d04c72c"},{"url":"https://git.kernel.org/stable/c/c78aea8984c84767e87f677477e4784deb8adfde"},{"url":"https://git.kernel.org/stable/c/e8b82184a1982894820a91a72ac9857ddd5dffbf"},{"url":"https://git.kernel.org/stable/c/370459776468fc68c97008360108f381e3120953"},{"url":"https://git.kernel.org/stable/c/d8c450ad0d08980b39b08d435efa921086c8b227"},{"url":"https://git.kernel.org/stable/c/03bb4338c3a7c3fc4decf699a35753f0891aab2a"},{"url":"https://git.kernel.org/stable/c/c0cd3fc6824122014da2b3b0cb7ddeaa2946ec8e"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:41:52.446Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.6.161"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.12.115"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.18.59"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"7.2.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}