{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-68381","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-07-30T09:28:09.387Z","datePublished":"2026-08-10T12:03:59.849Z","dateUpdated":"2026-08-17T05:04:27.523Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T05:04:27.523Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: pin conn during async oplock break notification\n\nsmb2_oplock_break_noti() and smb2_lease_break_noti() store a ksmbd_conn\npointer in an async ksmbd_work and then queue that work on ksmbd-io.  The\nwork only increments conn->r_count, which prevents teardown from passing\nthe pending-request wait after the increment, but it does not pin the\nstruct ksmbd_conn object.\n\nIf connection teardown races with an oplock break notification, the last\nconn reference can be dropped before the queued worker finishes.  The\nworker then uses the freed conn in ksmbd_conn_write() and\nksmbd_conn_r_count_dec().\n\nTake a real conn reference when publishing the conn pointer to the async\nwork item, and drop it after the notification work has decremented\nr_count.  Apply the same lifetime rule to lease break notification, which\nuses the same work->conn pattern."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL"},"scenarios":[{"lang":"en","value":"AV:N - ksmbd is the in-kernel SMB server listening on TCP/445 (and SMB-Direct); the oplock/lease break notification path is driven entirely by remote SMB2 CREATE/close traffic and connection teardown, so a remote peer reaches the freed-conn use over the network.\nAC:L - The attacker controls both sides of the race: one connection holds a batch oplock/lease while a second connection opens the same file to force the async break, and the first connection is then abruptly dropped so teardown passes the r_count wait before the increment lands; this can be retried across arbitrarily many connections.\nPR:N - ksmbd share access is commonly exposed with guest/anonymous mapping, so an unauthenticated or trivially-credentialed remote client can open files and trigger oplock/lease breaks; consistent with prior ksmbd connection-lifetime UAF scoring, no meaningful privilege gate protects this path.\nUI:N - No victim action is needed; the attacker's own two SMB connections create the oplock break and the racing disconnect entirely on their own initiative.\nS:U - The freed object and the corrupted state are both kernel memory owned by the ksmbd server within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Use-after-free of struct ksmbd_conn lets the attacker reclaim the slab object with attacker-shaped data and have the worker read conn->transport and response state from it, enabling disclosure of kernel memory and pointer values, potentially leaked back over the SMB connection.\nI:H - ksmbd_conn_write() dereferences conn->transport->ops->writev from the freed object and indirectly calls it, and ksmbd_conn_lock()/ksmbd_conn_r_count_dec() perform mutex and atomic/waitqueue writes into freed memory, giving heap-spray-based control-flow hijack and arbitrary-write potential.\nA:H - Even without successful exploitation, using a freed ksmbd_conn (mutex operations, transport pointer dereference, waitqueue wakeup) reliably causes memory corruption, oops, or kernel panic, taking down the whole system."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/server/oplock.c"],"versions":[{"version":"09aeab68033161cb54f194da93e51a11aee6144b","lessThan":"0f72fc9659d7f585460d43c158055df5afdcffb6","status":"affected","versionType":"git"},{"version":"a4261bbc33fbf99b99c80aa3a2c5097611802980","lessThan":"793e1c7041b93af96ff87e678329bc16aee7ba88","status":"affected","versionType":"git"},{"version":"3aa660c059240e0c795217182cf7df32909dd917","lessThan":"6ecb252efa0b413ac3d9979fb4eec247f8fc1258","status":"affected","versionType":"git"},{"version":"3aa660c059240e0c795217182cf7df32909dd917","lessThan":"14062c74e5b25c27edcff7a2fe0dc701c930b372","status":"affected","versionType":"git"},{"version":"3aa660c059240e0c795217182cf7df32909dd917","lessThan":"aa5d8f3f96aa11a4a54ce993c11ce8af11c546f9","status":"affected","versionType":"git"},{"version":"f17d1c63a76b0fe8e9c78023a86507a3a6d62cfa","status":"affected","versionType":"git"},{"version":"6.6.84","lessThan":"6.6.148","status":"affected","versionType":"semver"},{"version":"6.12.20","lessThan":"6.12.101","status":"affected","versionType":"semver"},{"version":"6.13.8","lessThan":"6.14","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/oplock.c"],"versions":[{"version":"6.14","status":"affected"},{"version":"0","lessThan":"6.14","status":"unaffected","versionType":"semver"},{"version":"6.6.148","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.101","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.42","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.6","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","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":"6.6.84","versionEndExcluding":"6.6.148"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.20","versionEndExcluding":"6.12.101"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14","versionEndExcluding":"6.18.42"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14","versionEndExcluding":"7.1.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.14","versionEndExcluding":"7.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13.8"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/0f72fc9659d7f585460d43c158055df5afdcffb6"},{"url":"https://git.kernel.org/stable/c/793e1c7041b93af96ff87e678329bc16aee7ba88"},{"url":"https://git.kernel.org/stable/c/6ecb252efa0b413ac3d9979fb4eec247f8fc1258"},{"url":"https://git.kernel.org/stable/c/14062c74e5b25c27edcff7a2fe0dc701c930b372"},{"url":"https://git.kernel.org/stable/c/aa5d8f3f96aa11a4a54ce993c11ce8af11c546f9"}],"title":"ksmbd: pin conn during async oplock break notification","x_generator":{"engine":"bippy-1.2.0"}}}}