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          "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)\")"
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              "value": "AV:N - The race is driven by the remote SMB server over TCP/445 \u2014 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\u0027s 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 \u2014 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\u0027s 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-\u003echans[]` is a fixed-size in-struct array and `index` is bounded by `chan_count \u003c= 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 \u2014 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 \u2014 propagating `-EIO`/`-ECONNABORTED` failures out of reads, writes, flushes and writeback across the whole mount \u2014 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."
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    "dateReserved": "2024-05-17T13:50:33.149Z",
    "dateUpdated": "2026-08-05T11:31:30.660Z",
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