{"id":"CVE-2026-90156","state":"PUBLISHED","title":"ksmbd: safely discard unregistered deferred locks","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: safely discard unregistered deferred locks\n\nWhen vfs_lock_file() defers a lock, smb2_lock() puts its ksmbd_lock on\nrollback_list before allocating and registering the asynchronous work.\nIf either operation fails, rollback assumes that smb_lock->conn is\ninitialized and dereferences NULL. The deferred file_lock also remains\nlinked into the VFS blocked-lock state while it is freed.\n\nKeep the lock off rollback_list until async setup succeeds. On setup\nfailures, explicitly unblock and wake the deferred lock before freeing it\nand its ksmbd wrapper.","publishedAt":"2026-09-17T16:06:48.393Z","updatedAt":"2026-10-30T12:34:29.152Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9","status":"affected","lessThan":"aaa51ac0d934cb4e2ab96e150fccc934e822009b","versionType":"git"},{"version":"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9","status":"affected","lessThan":"ecdcfa15b3d799476c685cecd433ebefc93015c8","versionType":"git"},{"version":"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9","status":"affected","lessThan":"77413400f083a959724de6f36348c9677ef9873a","versionType":"git"},{"version":"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9","status":"affected","lessThan":"52b91bc5253bb83665f3ea70565d0b2487dae643","versionType":"git"},{"version":"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9","status":"affected","lessThan":"d09af9a35ff7b77a950b507133d9092aadbfeff4","versionType":"git"},{"version":"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9","status":"affected","lessThan":"054bcca4cd9f00719b01f7108b51a2168fb94f15","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":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.57","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","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/aaa51ac0d934cb4e2ab96e150fccc934e822009b","https://git.kernel.org/stable/c/ecdcfa15b3d799476c685cecd433ebefc93015c8","https://git.kernel.org/stable/c/77413400f083a959724de6f36348c9677ef9873a","https://git.kernel.org/stable/c/52b91bc5253bb83665f3ea70565d0b2487dae643","https://git.kernel.org/stable/c/d09af9a35ff7b77a950b507133d9092aadbfeff4","https://git.kernel.org/stable/c/054bcca4cd9f00719b01f7108b51a2168fb94f15"],"weaknesses":[],"ingestedAt":"2026-10-30T12:54:04.478Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/90xxx/CVE-2026-90156.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-90156","state":"PUBLISHED","datePublished":"2026-09-17T16:06:48.393Z","dateUpdated":"2026-10-30T12:34:29.152Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.790Z"},"containers":{"cna":{"title":"ksmbd: safely discard unregistered deferred locks","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: safely discard unregistered deferred locks\n\nWhen vfs_lock_file() defers a lock, smb2_lock() puts its ksmbd_lock on\nrollback_list before allocating and registering the asynchronous work.\nIf either operation fails, rollback assumes that smb_lock->conn is\ninitialized and dereferences NULL. The deferred file_lock also remains\nlinked into the VFS blocked-lock state while it is freed.\n\nKeep the lock off rollback_list until async setup succeeds. On setup\nfailures, explicitly unblock and wake the deferred lock before freeing it\nand its ksmbd wrapper."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9","status":"affected","lessThan":"aaa51ac0d934cb4e2ab96e150fccc934e822009b","versionType":"git"},{"version":"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9","status":"affected","lessThan":"ecdcfa15b3d799476c685cecd433ebefc93015c8","versionType":"git"},{"version":"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9","status":"affected","lessThan":"77413400f083a959724de6f36348c9677ef9873a","versionType":"git"},{"version":"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9","status":"affected","lessThan":"52b91bc5253bb83665f3ea70565d0b2487dae643","versionType":"git"},{"version":"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9","status":"affected","lessThan":"d09af9a35ff7b77a950b507133d9092aadbfeff4","versionType":"git"},{"version":"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9","status":"affected","lessThan":"054bcca4cd9f00719b01f7108b51a2168fb94f15","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":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.57","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","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/aaa51ac0d934cb4e2ab96e150fccc934e822009b"},{"url":"https://git.kernel.org/stable/c/ecdcfa15b3d799476c685cecd433ebefc93015c8"},{"url":"https://git.kernel.org/stable/c/77413400f083a959724de6f36348c9677ef9873a"},{"url":"https://git.kernel.org/stable/c/52b91bc5253bb83665f3ea70565d0b2487dae643"},{"url":"https://git.kernel.org/stable/c/d09af9a35ff7b77a950b507133d9092aadbfeff4"},{"url":"https://git.kernel.org/stable/c/054bcca4cd9f00719b01f7108b51a2168fb94f15"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:34:29.152Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"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":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.12.114"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.18.57"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}