{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-39468", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-06-25T14:23:23.744Z", "datePublished": "2024-06-25T14:28:54.897Z", "dateUpdated": "2026-08-05T11:33:26.449Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:33:26.449Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix deadlock in smb2_find_smb_tcon()\n\nUnlock cifs_tcp_ses_lock before calling cifs_put_smb_ses() to avoid such\ndeadlock." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The vulnerable lookup is driven entirely by the SessionId and TreeId fields parsed out of an SMB2 response header received over TCP/445 from the remote SMB server, so a malicious/compromised server or an on-path attacker injecting a spoofed response (this path bypasses signature verification, as cancelled mids never reach cifs_check_receive) reaches it remotely.\nAC:L - Once a CREATE mid is cancelled, the attacker deterministically triggers the self-deadlock by returning STATUS_SUCCESS with a TreeId it fully controls, and it can force the cancellation precondition at will by stalling responses until the hung process is killed; no memory-layout precision or race window is involved and attempts can be repeated indefinitely.\nPR:N - The attacking SMB server needs no account, credential, or privilege on the victim client system; it only has to respond to the client's own in-flight request on an established connection.\nUI:N - With a mount already established (fstab, autofs, or a persistent share) and the server compromised or MITM'd, the malicious response is processed by the cifsd kernel thread with no victim action required; the cancellation trigger comes from ordinary kill/timeout/OOM machinery, not deliberate user interaction.\nS:U - The deadlock occurs in the kernel's CIFS client and its impact is confined to that same kernel security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:N - The bug is a pure spinlock recursion with no out-of-bounds access, uninitialized data, or freed-object reuse, so no kernel memory is disclosed.\nI:N - No memory is corrupted and no data is modified; the CPU simply spins forever on an already-held lock, giving the attacker no write primitive.\nA:H - The cifsd demux thread deadlocks with preemption disabled while permanently holding the global cifs_tcp_ses_lock, so every CIFS operation on every mount system-wide spins forever and cascades across CPUs, producing an unrecoverable hang and soft/hard lockup panic." } ] } ], "affected": [ { 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"git" }, { "version": "e695a9ad0305af6e8b0cbc24a54976ac2120cbb3", "lessThan": "02c418774f76a0a36a6195c9dbf8971eb4130a15", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/smb/client/smb2transport.c" ], "versions": [ { "version": "5.14", "status": "affected" }, { "version": "0", "lessThan": "5.14", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.162", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.94", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.34", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9.5", "lessThanOrEqual": "6.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.10", "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": "5.14", "versionEndExcluding": "5.15.162" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.1.94" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.6.34" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.9.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "6.10" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/b055752675cd1d1db4ac9c2750db3dc3e89ea261" }, { 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