{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-27404", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-25T13:47:42.681Z", "datePublished": "2024-05-17T11:40:21.607Z", "dateUpdated": "2026-08-05T11:29:36.752Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:29:36.752Z" }, "descriptions": [ { "lang": "en", "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H", "baseScore": 8.2, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/mptcp/pm_netlink.c", "net/mptcp/subflow.c" ], "versions": [ { "version": "bedee0b561138346967cf1443f2afd1b48b3148f", "lessThan": "e64148635509bf13eea851986f5a0b150e5bd066", "status": "affected", "versionType": "git" }, { "version": "bedee0b561138346967cf1443f2afd1b48b3148f", "lessThan": "2dba5774e8ed326a78ad4339d921a4291281ea6e", "status": "affected", "versionType": "git" }, { "version": "bedee0b561138346967cf1443f2afd1b48b3148f", "lessThan": "987c3ed7297e5661bc7f448f06fc366e497ac9b2", "status": "affected", "versionType": "git" }, { "version": "bedee0b561138346967cf1443f2afd1b48b3148f", "lessThan": "967d3c27127e71a10ff5c083583a038606431b61", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/mptcp/pm_netlink.c", "net/mptcp/subflow.c" ], "versions": [ { "version": "6.0", "status": "affected" }, { "version": "0", "lessThan": "6.0", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.81", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.19", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.7.7", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8", "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": "6.0", "versionEndExcluding": "6.1.81" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.6.19" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.7.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.8" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/e64148635509bf13eea851986f5a0b150e5bd066" }, { "url": "https://git.kernel.org/stable/c/2dba5774e8ed326a78ad4339d921a4291281ea6e" }, { "url": "https://git.kernel.org/stable/c/987c3ed7297e5661bc7f448f06fc366e497ac9b2" }, { "url": "https://git.kernel.org/stable/c/967d3c27127e71a10ff5c083583a038606431b61" } ], "title": "mptcp: fix data races on remote_id", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2024-06-17T17:39:39.256806Z", "id": "CVE-2024-27404", "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": "2024-06-17T17:43:55.610Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T00:34:52.192Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/e64148635509bf13eea851986f5a0b150e5bd066", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/2dba5774e8ed326a78ad4339d921a4291281ea6e", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/987c3ed7297e5661bc7f448f06fc366e497ac9b2", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/967d3c27127e71a10ff5c083583a038606431b61", "tags": [ "x_transferred" ] } ] } ] } }