250 lines
12 KiB
JSON
250 lines
12 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2024-27404",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-02-25T13:47:42.681Z",
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"datePublished": "2024-05-17T11:40:21.607Z",
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"dateUpdated": "2026-08-05T11:29:36.752Z"
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},
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"containers": {
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"cna": {
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:29:36.752Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: fix data races on remote_id\n\nSimilar to the previous patch, address the data race on\nremote_id, adding the suitable ONCE annotations."
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}
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H",
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"baseScore": 8.2,
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"baseSeverity": "HIGH"
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{
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"lang": "en",
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"value": "AV:N - Both sides of the race are driven by remote MPTCP protocol data — the peer's MP_JOIN SYN-ACK writes `remote_id` from softirq via `subflow_finish_connect()`, while the peer's RM_ADDR/ADD_ADDR options drive the concurrent path-manager reads in `mptcp_pm_nl_rm_addr_or_subflow()` and `fill_remote_addresses_vec()`. No local access is needed.\nAC:L - The remote peer controls both racing sides and their timing: it chooses when to emit the MP_JOIN SYN-ACK carrying `join_id` and when to send RM_ADDR/ADD_ADDR that schedules the PM worker, and it can repeat this across many subflows and connections until the window is hit.\nPR:N - An MPTCP-enabled listening service accepts connections from any unauthenticated remote peer, and subflow creation plus ADD_ADDR/RM_ADDR signalling occur as part of normal protocol operation with no credentials required.\nUI:N - The MPTCP option exchange and path-manager subflow handling happen automatically inside the kernel once a connection is accepted; no local user action is involved.\nS:U - The unsynchronized access and all resulting effects are confined to the kernel networking stack's own security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:N - `remote_id` is a u8 that is never used as an array index or pointer, and the only value exposed is the peer's own address ID via diag/netlink; no kernel memory contents are disclosed.\nI:L - Inconsistent reads let the path manager act on a wrong subflow identity — bypassing the `deny_id0` join restriction in `fill_remote_addresses_vec()` and underflowing the u8 `pm.add_addr_accepted`/`pm.local_addr_used` counters — which is limited, non-arbitrary modification of kernel connection state.\nA:H - A mismatched `remote_id` compare in `mptcp_pm_nl_rm_addr_or_subflow()` causes `mptcp_subflow_shutdown()` and `mptcp_close_ssk()` to tear down subflows the peer did not ask to remove — potentially the last remaining one, collapsing the MPTCP connection — and this is remotely and repeatably triggerable without authentication."
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}
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]
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}
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"net/mptcp/pm_netlink.c",
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"net/mptcp/subflow.c"
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"net/mptcp/pm_netlink.c",
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"version": "6.8",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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