{ "schema_version": "1.6.1", "id": "RPI-CVE-2024-39468", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2024-39468" ], "published": "2024-06-25T14:29:06Z", "summary": "smb: client: fix deadlock in smb2_find_smb_tcon()", "details": "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.", "severity": [ { "type": "CVSS_V3", "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H" } ], "affected": [ { "package": { "ecosystem": "Raspberry Pi OS:12", "name": "linux" }, "versions": [ "1:6.1.47-1+rpt2", "1:6.1.47-1+rpt4", "1:6.1.54-1+rpt2", "1:6.1.58-1+rpt2", "1:6.1.63-1+rpt1", "1:6.1.73-1+rpt1", "1:6.6.20-1+rpt1", "1:6.6.28-1+rpt1", "1:6.6.31-1+rpt1" ], "ecosystem_specific": { "binaries": [ { "binary_name": "linux-image-6.1.0-rpi2-rpi-v6", "binary_version": "1:6.1.47-1+rpt2" }, { "binary_name": "linux-image-6.1.0-rpi2-rpi-v7", 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"1:6.6.20-1+rpt1": { "linux_commit": "6f16847710cc0502450788b9f12f0a14d3429668", "upstream_version": "6.6.20", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.34" }, "1:6.6.28-1+rpt1": { "linux_commit": "0c341f47adc3578cd5f817aa20ee2b7f9ae6b23e", "upstream_version": "6.6.28", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.34" }, "1:6.6.31-1+rpt1": { "linux_commit": "c1432b4bae5b6582f4d32ba381459f33c34d1424", "upstream_version": "6.6.31", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.34" } } } } ], "references": [ { "type": "ADVISORY", "url": "https://www.cve.org/CVERecord?id=CVE-2024-39468" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/b055752675cd1d1db4ac9c2750db3dc3e89ea261" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/21f5dd36e655d25a7b45b61c1e537198b671f720" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/b09b556e48968317887a11243a5331a7bc00ece5" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/225de871ddf994f69a57f035709cad9c0ab8615a" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/8d0f5f1ccf675454a833a573c53830a49b7d1a47" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/02c418774f76a0a36a6195c9dbf8971eb4130a15" } ], "database_specific": { "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git", "upstream_modified": "2026-08-05T11:52:36Z", "severity": { "source": "kernel CNA", "cvss_v3_score": 7.5, "cvss_v3_severity": "High", "scenario": "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." } } }