{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-35999","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-05-17T13:50:33.149Z","datePublished":"2024-05-20T09:48:01.653Z","dateUpdated":"2026-08-05T11:31:30.660Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T11:31:30.660Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb3: missing lock when picking channel\n\nCoverity spotted a place where we should have been holding the\nchannel lock when accessing the ses channel index.\n\nAddresses-Coverity: 1582039 (\"Data race condition (MISSING_LOCK)\")"}],"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 race is driven by the remote SMB server over TCP/445 — channel invalidation happens in `cifs_chan_skip_or_disable()` and `cifs_decrease_secondary_channels()`, both reached from responses the server controls (dropping `SMB2_GLOBAL_CAP_MULTI_CHANNEL` on reconnect, changing the advertised interface list, or resetting a channel's connection). A malicious or compromised server, or an on-path attacker, can force channel teardown at will against a client with a multichannel mount.\nAC:L - The remote peer deterministically and repeatedly controls one side of the race by tearing down or re-advertising channels, while ongoing background I/O and writeback continuously call `cifs_pick_channel()` for the other side; the server can even force client requests via oplock/lease breaks. No unpredictable memory layout or victim state is required, and SMB3 multichannel is a widely deployed mount option rather than a rare config.\nPR:N - The attacker is the remote SMB peer or an on-path attacker and needs no account, credentials, or privileges on the victim client; the defect is hit during ordinary operation of an already-established session.\nUI:N - The multichannel CIFS mount is a pre-existing environmental condition (fstab/autofs/Azure Files), and at exploit time no deliberate victim action is needed — background writeback, echoes, and cached-dir refreshes reach `cifs_pick_channel()` on their own.\nS:U - The unsynchronized read and its effects are confined to the client kernel's own CIFS session and `TCP_Server_Info` structures within a single security authority; no VM, IOMMU, container, or sandbox boundary is crossed.\nC:N - `ses->chans[]` is a fixed-size in-struct array and `index` is bounded by `chan_count <= CIFS_MAX_CHANNELS`, so the racy load reads no out-of-bounds memory and yields no read primitive; the observable value is a NULL or unvalidated channel pointer, not disclosed kernel data.\nI:N - Nothing is written out of bounds and no file data or kernel object is modified — the defect only causes the wrong (or NULL) channel to be selected, and SMB signing/encryption still governs what is actually transmitted.\nA:H - The returned channel was never validated, so it can be NULL — propagating `-EIO`/`-ECONNABORTED` failures out of reads, writes, flushes and writeback across the whole mount — or a channel already marked `terminate`/`NEEDS_RECONNECT`, in which case requests are submitted on a dying connection and block until reconnect or timeout, wedging the mount. The remote server can retrigger this indefinitely."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/smb/client/transport.c"],"versions":[{"version":"724244cdb3828522109c88e56a0242537aefabe9","lessThan":"98c7ed29cd754ae7475dc7cb3f33399fda902729","status":"affected","versionType":"git"},{"version":"724244cdb3828522109c88e56a0242537aefabe9","lessThan":"0fcf7e219448e937681216353c9a58abae6d3c2e","status":"affected","versionType":"git"},{"version":"724244cdb3828522109c88e56a0242537aefabe9","lessThan":"60ab245292280905603bc0d3654f4cf8fceccb00","status":"affected","versionType":"git"},{"version":"724244cdb3828522109c88e56a0242537aefabe9","lessThan":"8094a600245e9b28eb36a13036f202ad67c1f887","status":"affected","versionType":"git"},{"version":"3d74c2c917e4006a3bd660d2fc7829cb2ef64113","status":"affected","versionType":"git"},{"version":"5.15.27","lessThan":"5.16","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/client/transport.c"],"versions":[{"version":"5.16","status":"affected"},{"version":"0","lessThan":"5.16","status":"unaffected","versionType":"semver"},{"version":"6.1.91","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.30","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.8.9","lessThanOrEqual":"6.8.*","status":"unaffected","versionType":"semver"},{"version":"6.9","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":"5.16","versionEndExcluding":"6.1.91"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.6.30"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.8.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.27"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/98c7ed29cd754ae7475dc7cb3f33399fda902729"},{"url":"https://git.kernel.org/stable/c/0fcf7e219448e937681216353c9a58abae6d3c2e"},{"url":"https://git.kernel.org/stable/c/60ab245292280905603bc0d3654f4cf8fceccb00"},{"url":"https://git.kernel.org/stable/c/8094a600245e9b28eb36a13036f202ad67c1f887"}],"title":"smb3: missing lock when picking channel","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"problemTypes":[{"descriptions":[{"type":"CWE","lang":"en","description":"CWE-noinfo Not enough information"}]}],"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.5,"attackVector":"LOCAL","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"timestamp":"2024-05-31T18:47:15.980890Z","id":"CVE-2024-35999","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-10-29T20:01:44.554Z"}},{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-02T03:30:13.189Z"},"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/98c7ed29cd754ae7475dc7cb3f33399fda902729","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/0fcf7e219448e937681216353c9a58abae6d3c2e","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/60ab245292280905603bc0d3654f4cf8fceccb00","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/8094a600245e9b28eb36a13036f202ad67c1f887","tags":["x_transferred"]}]}]}}