{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89792","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-11T19:38:34.766Z","datePublished":"2026-09-16T08:50:06.516Z","dateUpdated":"2026-10-03T10:56:37.887Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-10-03T10:56:37.887Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: prevent out-of-bounds reads in share config responses\n\nValidate IPC share configuration payload sizes before consuming\nvariable-length fields. Bound veto list parsing and account for\nthe separator byte when deriving the path length."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","baseScore":7.1,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - Malformed payload_sz/veto_list_sz and unterminated veto/path bytes are consumed from a ksmbd generic-netlink SHARE_CONFIG_RESPONSE (handle_generic_event → ipc_validate_msg → share_config_request), not from SMB PDUs. A remote TREE_CONNECT only creates the pending IPC request; the attacker must be local to inject or control that response.\nAC:L - The attacker fully controls the crafted netlink length fields and can set payload_sz to 0 or omit NULs so the old checks pass. Pending handles come from a small IDA and can be brute-forced against a TREE_CONNECT the attacker also triggers; no victim timing or rare config is required.\nPR:L - handle_generic_event requires CAP_NET_ADMIN only when CONFIG_SMB_SERVER_CHECK_CAP_NET_ADMIN is set; SMBD_GENL is netns-aware, has no GENL_ADMIN_PERM, and does not bind responses to ksmbd_tools_pid. That capability is Low, and builds that disable the check allow any local user to send the message.\nUI:N - The attacker sends the malformed SHARE_CONFIG_RESPONSE and can issue the matching SMB2 TREE_CONNECT themselves; no separate victim or administrator action is required once ksmbd is running.\nS:U - The out-of-bounds reads and any resulting oops remain inside the ksmbd/kernel security authority on the host. This is not a VM escape, IOMMU/DMA bypass, or other cross-boundary impact.\nC:H - With payload_sz==0 the kernel kstrndup()s up to PATH_MAX bytes past the IPC object, and parse_veto_list() uses unbounded strlen()/kstrdup() when the veto buffer lacks a NUL within veto_list_sz. Those are large kernel-heap over-reads, not a few bounded bytes.\nI:N - The defects are out-of-bounds reads (strlen, kstrndup, kstrdup) into newly allocated strings; there is no out-of-bounds write or control-flow hijack primitive. A local IPC sender can already supply a well-formed share path without this bug.\nA:H - Walking strlen() or kstrndup(..., PATH_MAX) off the end of the IPC slab into unmapped memory oopses the ksmbd worker. The attacker can repeat the crafted response against further TREE_CONNECT-triggered requests and crash the kernel at will."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/server/mgmt/share_config.c","fs/smb/server/transport_ipc.c"],"versions":[{"version":"88b7f1143b15b29cccb8392b4f38e75b7bb3e300","lessThan":"df8aa4a09733c4d3974b1db32c1782b3aad3a151","status":"affected","versionType":"git"},{"version":"51a6c2af9d20203ddeeaf73314ba8854b38d01bd","lessThan":"0127f1c119bde40578f4d25f5d17333b4e75de8c","status":"affected","versionType":"git"},{"version":"a637fabac554270a851033f5ab402ecb90bc479c","lessThan":"fd636a87161def6e35876ab7943641ce457974c8","status":"affected","versionType":"git"},{"version":"a677ebd8ca2f2632ccdecbad7b87641274e15aac","lessThan":"ffa507f5f774cb4d45136b106989ebc051361263","status":"affected","versionType":"git"},{"version":"a677ebd8ca2f2632ccdecbad7b87641274e15aac","lessThan":"cd2bcee450bc94770be56c0b896c1a1dc6838bd8","status":"affected","versionType":"git"},{"version":"a677ebd8ca2f2632ccdecbad7b87641274e15aac","lessThan":"61a8d06600c8c397f9a7e01940479d4c94a82f5f","status":"affected","versionType":"git"},{"version":"a677ebd8ca2f2632ccdecbad7b87641274e15aac","lessThan":"f25e93768fcc5d8287e50b1ec52a42e4c276df34","status":"affected","versionType":"git"},{"version":"76af689a45aa44714b46d1a7de4ffdf851ded896","status":"affected","versionType":"git"},{"version":"5.15.157","lessThan":"5.15.222","status":"affected","versionType":"semver"},{"version":"6.1.85","lessThan":"6.1.189","status":"affected","versionType":"semver"},{"version":"6.6.26","lessThan":"6.6.158","status":"affected","versionType":"semver"},{"version":"6.8.5","lessThan":"6.9","status":"affected","versionType":"semver"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/server/mgmt/share_config.c","fs/smb/server/transport_ipc.c"],"versions":[{"version":"6.9","status":"affected"},{"version":"0","lessThan":"6.9","status":"unaffected","versionType":"semver"},{"version":"5.15.222","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.189","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.158","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.111","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.53","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.6","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3-rc2","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":"5.15.157","versionEndExcluding":"5.15.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.85","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.26","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"6.12.111"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.9","versionEndExcluding":"7.3-rc2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.8.5"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/df8aa4a09733c4d3974b1db32c1782b3aad3a151"},{"url":"https://git.kernel.org/stable/c/0127f1c119bde40578f4d25f5d17333b4e75de8c"},{"url":"https://git.kernel.org/stable/c/fd636a87161def6e35876ab7943641ce457974c8"},{"url":"https://git.kernel.org/stable/c/ffa507f5f774cb4d45136b106989ebc051361263"},{"url":"https://git.kernel.org/stable/c/cd2bcee450bc94770be56c0b896c1a1dc6838bd8"},{"url":"https://git.kernel.org/stable/c/61a8d06600c8c397f9a7e01940479d4c94a82f5f"},{"url":"https://git.kernel.org/stable/c/f25e93768fcc5d8287e50b1ec52a42e4c276df34"}],"title":"ksmbd: prevent out-of-bounds reads in share config responses","x_generator":{"engine":"bippy-1.2.0"}}}}