CVE-2026-64390

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The\nfinal close and durable handle paths, however, remove the connection\nlist entry while holding fp->conn->llist_lock.\n\nWith SMB3 multichannel, the connection handling the LOCK request can be\ndifferent from the connection which opened the file. The entry can\ntherefore be removed under a different spinlock from the one protecting\nthe list it belongs to. A concurrent traversal can then access freed\nstruct ksmbd_lock and struct file_lock objects.\n\nRecord the connection owning each lock's clist entry and hold a\nreference to it while the entry is linked. Use that connection and its\nllist_lock for unlock, rollback, close, and durable preserve. Durable\nreconnect assigns the new connection as the owner when publishing the\nlocks again."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - An attacker reaches smb2_lock through remotely supplied SMB2 requests handled by ksmbd over TCP port 445.\nAC:L - In a multichannel deployment, the attacker controls the channels, lock creation, concurrent traversal, connection teardown, and close operations needed to trigger the lifetime violation.\nPR:L - The path requires a valid non-guest SMB3 session, signed multichannel binding, authorized tree connection, and an accessible file handle. An ordinary authenticated share user suffices; no administrative privilege is required.\nUI:N - The authenticated attacker can open, lock, traverse, and close the file or disconnect a channel without any victim action.\nS:U - The memory corruption compromises the ksmbd host kernel within the same security authority and does not inherently cross a VM, container, or IOMMU boundary.\nC:H - Freed ksmbd_lock and file_lock objects can be reclaimed and subsequently dereferenced during connection lock-list traversal, supporting disclosure of arbitrary kernel memory during exploitation.\nI:H - Stale list_del operations write through freed or attacker-influenced list pointers, providing exploitable heap corruption that can plausibly yield arbitrary writes and kernel code execution.\nA:H - The use-after-free and corrupted linked lists can cause kernel oopses, panics, or hangs, and the remote attacker can repeatedly retrigger the condition."}]}], "affected": [{"product": "Linux", "vendor": 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"https://git.kernel.org/stable/c/427faaa52b0b399940c1a88065a5c310d10dad15"}, {"url": "https://git.kernel.org/stable/c/5fecc15a30cb9ebd310f7b52c1ab607edcea78f6"}, {"url": "https://git.kernel.org/stable/c/c1016dd1d8b2bcd1158bbaabe94a31bb7e7431fb"}], "title": "ksmbd: track the connection owning a byte-range lock", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

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The\nfinal close and durable handle paths, however, remove the connection\nlist entry while holding fp->conn->llist_lock.\n\nWith SMB3 multichannel, the connection handling the LOCK request can be\ndifferent from the connection which opened the file. The entry can\ntherefore be removed under a different spinlock from the one protecting\nthe list it belongs to. A concurrent traversal can then access freed\nstruct ksmbd_lock and struct file_lock objects.\n\nRecord the connection owning each lock's clist entry and hold a\nreference to it while the entry is linked. Use that connection and its\nllist_lock for unlock, rollback, close, and durable preserve. Durable\nreconnect assigns the new connection as the owner when publishing the\nlocks again."}], "id": "CVE-2026-64390", "lastModified": "2026-09-04T19:07:30.470", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-07-25T10:17:22.330", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/22d38cf75b556c20b039743bdf3654d535b858be"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/427faaa52b0b399940c1a88065a5c310d10dad15"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5fecc15a30cb9ebd310f7b52c1ab607edcea78f6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/66eb3643164e5e1029907793926c132f8b5c6148"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c1016dd1d8b2bcd1158bbaabe94a31bb7e7431fb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ea5c9bf99f626a15cc59f645dc895f2b3f01992e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fe20d492a69a6f79e637f438072b212e21ed3b78"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ksmbd: track the connection owning a byte-range lock", "id": "2507113", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507113"}, "csaw": false, "details": ["A flaw was found in the Linux kernel's ksmbd component, which provides Server Message Block (SMB) protocol support. This vulnerability involves incorrect management of byte-range locks when multiple connections are used with SMB3 multichannel. An attacker could exploit this by sending specially crafted SMB requests, potentially causing memory corruption. This could lead to system instability or a denial of service (DoS), making the system unavailable."], "name": "CVE-2026-64390", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64390\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64390\nhttps://lore.kernel.org/linux-cve-announce/2026072527-CVE-2026-64390-4894@gregkh/T"]}

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