CVE-2024-39468

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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": [{"product": "Linux", "vendor": 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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 - 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"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "C6FAA8A5-3F50-4B9F-9EEA-8430F59C03AB", "versionEndExcluding": "5.10.221", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "10A39ACC-3005-40E8-875C-98A372D1FFD5", "versionEndExcluding": "5.15.162", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "9D20DE32-76F8-4E4C-A8DF-5B53082D18E5", "versionEndExcluding": "6.1.94", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "6BD9DCFD-0342-4039-B8CE-70F26DB7173B", "versionEndExcluding": "6.6.34", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": 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{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b055752675cd1d1db4ac9c2750db3dc3e89ea261"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b09b556e48968317887a11243a5331a7bc00ece5"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/02c418774f76a0a36a6195c9dbf8971eb4130a15"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/21f5dd36e655d25a7b45b61c1e537198b671f720"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/225de871ddf994f69a57f035709cad9c0ab8615a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8d0f5f1ccf675454a833a573c53830a49b7d1a47"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b055752675cd1d1db4ac9c2750db3dc3e89ea261"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b09b556e48968317887a11243a5331a7bc00ece5"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-355557.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-613116.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-667"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: smb: client: fix deadlock in smb2_find_smb_tcon()", "id": "2294307", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2294307"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-667", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nsmb: client: fix deadlock in smb2_find_smb_tcon()\nUnlock cifs_tcp_ses_lock before calling cifs_put_smb_ses() to avoid such\ndeadlock."], "name": "CVE-2024-39468", "package_state": [{"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": "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"}], "public_date": "2024-06-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-39468\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-39468\nhttps://lore.kernel.org/linux-cve-announce/2024062500-CVE-2024-39468-11d2@gregkh/T"], "threat_severity": "Low"}

{}