{ "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" ] } ] } ] } }