{"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": "2026-08-13T22:44:02.865Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-13T22:44:02.865Z"}, "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-rc4", "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-rc4"}, {"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"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/smb/server/oplock.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "0f72fc9659d7f585460d43c158055df5afdcffb6", "status": "affected", "version": "09aeab68033161cb54f194da93e51a11aee6144b", "versionType": "git"}, {"lessThan": "793e1c7041b93af96ff87e678329bc16aee7ba88", "status": "affected", "version": "a4261bbc33fbf99b99c80aa3a2c5097611802980", "versionType": "git"}, {"lessThan": "6ecb252efa0b413ac3d9979fb4eec247f8fc1258", "status": "affected", "version": "3aa660c059240e0c795217182cf7df32909dd917", "versionType": "git"}, {"lessThan": "14062c74e5b25c27edcff7a2fe0dc701c930b372", "status": "affected", "version": "3aa660c059240e0c795217182cf7df32909dd917", "versionType": "git"}, {"lessThan": "aa5d8f3f96aa11a4a54ce993c11ce8af11c546f9", "status": "affected", "version": "3aa660c059240e0c795217182cf7df32909dd917", "versionType": "git"}, {"status": "affected", "version": "f17d1c63a76b0fe8e9c78023a86507a3a6d62cfa", "versionType": "git"}, {"lessThan": "6.6.148", "status": "affected", "version": "6.6.84", "versionType": "semver"}, {"lessThan": "6.12.101", "status": "affected", "version": "6.12.20", "versionType": "semver"}, {"lessThan": "6.14", "status": "affected", "version": "6.13.8", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/smb/server/oplock.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.14"}, {"lessThan": "6.14", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.148", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.101", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.42", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2-rc4", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-68381", "lastModified": "2026-08-13T23:17:33.350", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-10T13:20:31.197", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0f72fc9659d7f585460d43c158055df5afdcffb6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/14062c74e5b25c27edcff7a2fe0dc701c930b372"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6ecb252efa0b413ac3d9979fb4eec247f8fc1258"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/793e1c7041b93af96ff87e678329bc16aee7ba88"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/aa5d8f3f96aa11a4a54ce993c11ce8af11c546f9"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: ksmbd: Use-after-free vulnerability due to race condition in connection handling", "id": "2513199", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2513199"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-364", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nksmbd: pin conn during async oplock break notification\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.\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().\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.", "A flaw was found in ksmbd, a Linux kernel module that provides an in-kernel SMB server. A race condition exists during connection teardown and asynchronous oplock or lease break notifications. This can lead to a use-after-free vulnerability, where a freed connection object is still accessed by a queued worker. This issue could potentially result in memory corruption, leading to system instability or a denial of service."], "name": "CVE-2026-68381", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:enterprise_linux_nvidia:", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux for NVIDIA 26"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-08-10T12:03:59Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-68381\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-68381\nhttps://git.kernel.org/stable/c/0f72fc9659d7f585460d43c158055df5afdcffb6\nhttps://git.kernel.org/stable/c/14062c74e5b25c27edcff7a2fe0dc701c930b372\nhttps://git.kernel.org/stable/c/6ecb252efa0b413ac3d9979fb4eec247f8fc1258\nhttps://git.kernel.org/stable/c/793e1c7041b93af96ff87e678329bc16aee7ba88\nhttps://git.kernel.org/stable/c/aa5d8f3f96aa11a4a54ce993c11ce8af11c546f9"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[09aeab68033161cb54f194da93e51a11aee6144b,0f72fc9659d7f585460d43c158055df5afdcffb6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[a4261bbc33fbf99b99c80aa3a2c5097611802980,793e1c7041b93af96ff87e678329bc16aee7ba88)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3aa660c059240e0c795217182cf7df32909dd917,6ecb252efa0b413ac3d9979fb4eec247f8fc1258)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3aa660c059240e0c795217182cf7df32909dd917,14062c74e5b25c27edcff7a2fe0dc701c930b372)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3aa660c059240e0c795217182cf7df32909dd917,aa5d8f3f96aa11a4a54ce993c11ce8af11c546f9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "f17d1c63a76b0fe8e9c78023a86507a3a6d62cfa"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.6.84,6.6.148)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.12.20,6.12.101)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.13.8,6.14)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "6.14"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.14)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.148,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.101,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.42,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.6,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc4,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-10T16:30:05.110668+00:00", "updated": "2026-08-14T01:15:17.097499+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}