{"id":"CVE-2026-89794","state":"PUBLISHED","title":"ksmbd: zero pipe read compound padding","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: zero pipe read compound padding\n\nCompound response handling extends the last response iov to an eight-byte\nboundary.\n\nsmb2_read_pipe() allocates only the payload size, so the alignment padding\ncan expose up to seven bytes of uninitialized kernel heap memory.\n\nAllocate the aligned size and clear the unused tail before pinning the\nresponse buffer.","publishedAt":"2026-09-16T10:30:25.592Z","updatedAt":"2026-10-30T12:33:02.393Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"9f297df20d93411c0b4ddad7f88ba04a7cd36e77","status":"affected","lessThan":"c7516bdf7d2c1a64b14a9f444e2ee58c12c384ae","versionType":"git"},{"version":"e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d","status":"affected","lessThan":"134d980491b435e5cdb3171225e2506ff17867d1","versionType":"git"},{"version":"e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d","status":"affected","lessThan":"f188a400dd5285fec5a84548fe8dca49eee01155","versionType":"git"},{"version":"e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d","status":"affected","lessThan":"d83a9de7cecd401c3d3e00ed6371194dcd7313e4","versionType":"git"},{"version":"e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d","status":"affected","lessThan":"be15b8da4a82cf1e1f9880b2661b90770606eec1","versionType":"git"},{"version":"e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d","status":"affected","lessThan":"73f860489e3be2245598d1819226304fc5b87291","versionType":"git"},{"version":"f2283680a80571ca82d710bc6ecd8f8beac67d63","status":"affected","versionType":"git"},{"version":"6.1.71","status":"affected","lessThan":"6.1.191","versionType":"semver"},{"version":"5.15.145","status":"affected","lessThan":"5.16","versionType":"semver"}],"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":"6.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.6","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.51","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.5","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/c7516bdf7d2c1a64b14a9f444e2ee58c12c384ae","https://git.kernel.org/stable/c/134d980491b435e5cdb3171225e2506ff17867d1","https://git.kernel.org/stable/c/f188a400dd5285fec5a84548fe8dca49eee01155","https://git.kernel.org/stable/c/d83a9de7cecd401c3d3e00ed6371194dcd7313e4","https://git.kernel.org/stable/c/be15b8da4a82cf1e1f9880b2661b90770606eec1","https://git.kernel.org/stable/c/73f860489e3be2245598d1819226304fc5b87291"],"weaknesses":[],"ingestedAt":"2026-10-30T12:52:04.348Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/89xxx/CVE-2026-89794.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89794","state":"PUBLISHED","datePublished":"2026-09-16T10:30:25.592Z","dateUpdated":"2026-10-30T12:33:02.393Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.766Z"},"containers":{"cna":{"title":"ksmbd: zero pipe read compound padding","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: zero pipe read compound padding\n\nCompound response handling extends the last response iov to an eight-byte\nboundary.\n\nsmb2_read_pipe() allocates only the payload size, so the alignment padding\ncan expose up to seven bytes of uninitialized kernel heap memory.\n\nAllocate the aligned size and clear the unused tail before pinning the\nresponse buffer."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"9f297df20d93411c0b4ddad7f88ba04a7cd36e77","status":"affected","lessThan":"c7516bdf7d2c1a64b14a9f444e2ee58c12c384ae","versionType":"git"},{"version":"e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d","status":"affected","lessThan":"134d980491b435e5cdb3171225e2506ff17867d1","versionType":"git"},{"version":"e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d","status":"affected","lessThan":"f188a400dd5285fec5a84548fe8dca49eee01155","versionType":"git"},{"version":"e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d","status":"affected","lessThan":"d83a9de7cecd401c3d3e00ed6371194dcd7313e4","versionType":"git"},{"version":"e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d","status":"affected","lessThan":"be15b8da4a82cf1e1f9880b2661b90770606eec1","versionType":"git"},{"version":"e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d","status":"affected","lessThan":"73f860489e3be2245598d1819226304fc5b87291","versionType":"git"},{"version":"f2283680a80571ca82d710bc6ecd8f8beac67d63","status":"affected","versionType":"git"},{"version":"6.1.71","status":"affected","lessThan":"6.1.191","versionType":"semver"},{"version":"5.15.145","status":"affected","lessThan":"5.16","versionType":"semver"}],"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":"6.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.6","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.51","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.5","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/c7516bdf7d2c1a64b14a9f444e2ee58c12c384ae"},{"url":"https://git.kernel.org/stable/c/134d980491b435e5cdb3171225e2506ff17867d1"},{"url":"https://git.kernel.org/stable/c/f188a400dd5285fec5a84548fe8dca49eee01155"},{"url":"https://git.kernel.org/stable/c/d83a9de7cecd401c3d3e00ed6371194dcd7313e4"},{"url":"https://git.kernel.org/stable/c/be15b8da4a82cf1e1f9880b2661b90770606eec1"},{"url":"https://git.kernel.org/stable/c/73f860489e3be2245598d1819226304fc5b87291"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:33:02.393Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.71","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"6.18.51"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"7.2.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6","versionEndExcluding":"7.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.145"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}