{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-50185", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-10-21T19:36:19.966Z", "datePublished": "2024-11-08T05:38:26.359Z", "dateUpdated": "2026-08-05T11:42:20.717Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:42:20.717Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: handle consistently DSS corruption\n\nBugged peer implementation can send corrupted DSS options, consistently\nhitting a few warning in the data path. Use DEBUG_NET assertions, to\navoid the splat on some builds and handle consistently the error, dumping\nrelated MIBs and performing fallback and/or reset according to the\nsubflow type." } ], "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 - The corrupted DSS option is parsed entirely in the TCP/MPTCP packet receive path (`subflow_data_ready` → `mptcp_data_ready` → `__mptcp_move_skbs_from_subflow`), with no syscall or local access involved. Any remote MPTCP peer across the internet can send the malformed segment.\nAC:L - The attacker fully controls both sides of the mismatch — the DSS `data_len` and the actual TCP payload length — and `validate_mapping()` never checks the skb end, so a single segment with `data_len` smaller than its payload triggers the condition deterministically. The commit itself states corrupted DSS options \"consistently\" hit the warnings.\nPR:N - MPTCP has no authentication on the initial subflow; an unauthenticated client connecting to any `IPPROTO_MPTCP` listener (or a hostile server the host dials out to) can send the corrupted DSS immediately after the handshake. No credentials or local account are required.\nUI:N - Triggering happens in softirq context on packet arrival with no action from any local user or application. `net.mptcp.enabled` defaults to 1, so a running MPTCP-enabled service is a deployment property, not user interaction.\nS:U - The corruption is confined to the kernel's own MPTCP subflow state and the affected socket; no VM, IOMMU, or sandbox boundary is crossed. Impact stays within the kernel's security authority.\nC:N - I traced `MPTCP_SKB_CB(skb)->offset` through `__mptcp_ofo_queue()` and `mptcp_recvmsg()` and it remains bounded by `skb->len`, so there is no out-of-bounds read or uninitialized-memory disclosure. All data involved originates from the attacking peer itself, and the WARN backtrace goes to local dmesg rather than to the remote attacker.\nI:L - After the `break` skips the `copied_seq` update, the subflow's TCP receive state is permanently desynchronized, causing `sk_eat_skb()` to silently discard already-ACKed application data and causing bytes past the mapping to be delivered at DSNs belonging to other data. This is a bounded corruption of kernel subflow state and of the byte stream handed to the application, not an arbitrary write or control-flow hijack.\nA:H - The remotely reachable `WARN_ON_ONCE()` in the softirq receive path is an immediate kernel panic on any system with `panic_on_warn=1`, a common hardened/cloud setting. Even without it, the resulting `copied_seq` desync wedges the connection and drops data until the subflow is torn down, which is why the fix forces a fallback or `mptcp_subflow_reset()`." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/mptcp/mib.c", "net/mptcp/mib.h", "net/mptcp/protocol.c", "net/mptcp/subflow.c" ], "versions": [ { "version": "6771bfd9ee2460c13e38c0cd46a3afb5404ae716", "lessThan": "fde99e972b8f88cebe619241d7aa43d288ef666a", "status": "affected", "versionType": "git" }, { "version": "6771bfd9ee2460c13e38c0cd46a3afb5404ae716", "lessThan": "12c1676d598e3b8dd92a033b623b792cc2ea1ec5", "status": "affected", "versionType": "git" }, { "version": "6771bfd9ee2460c13e38c0cd46a3afb5404ae716", "lessThan": "35668f8ec84f6c944676e48ecc6bbc5fc8e6fe25", "status": "affected", "versionType": "git" }, { "version": "6771bfd9ee2460c13e38c0cd46a3afb5404ae716", "lessThan": "b8be15d1ae7ea4eedd547c3b3141f592fbddcd30", "status": "affected", "versionType": "git" }, { "version": "6771bfd9ee2460c13e38c0cd46a3afb5404ae716", "lessThan": "8bfd391bde685df7289b928ce8876a3583be4bfb", "status": "affected", "versionType": "git" }, { "version": "6771bfd9ee2460c13e38c0cd46a3afb5404ae716", "lessThan": "e32d262c89e2b22cb0640223f953b548617ed8a6", "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/mib.c", "net/mptcp/mib.h", "net/mptcp/protocol.c", "net/mptcp/subflow.c" ], "versions": [ { "version": "5.7", "status": "affected" }, { "version": "0", "lessThan": "5.7", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.228", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.169", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.113", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.57", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.11.4", "lessThanOrEqual": "6.11.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12", "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": "5.7", "versionEndExcluding": "5.10.228" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "5.15.169" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.1.113" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.6.57" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.11.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "6.12" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/fde99e972b8f88cebe619241d7aa43d288ef666a" }, { "url": "https://git.kernel.org/stable/c/12c1676d598e3b8dd92a033b623b792cc2ea1ec5" }, { "url": "https://git.kernel.org/stable/c/35668f8ec84f6c944676e48ecc6bbc5fc8e6fe25" }, { "url": "https://git.kernel.org/stable/c/b8be15d1ae7ea4eedd547c3b3141f592fbddcd30" }, { "url": "https://git.kernel.org/stable/c/8bfd391bde685df7289b928ce8876a3583be4bfb" }, { "url": "https://git.kernel.org/stable/c/e32d262c89e2b22cb0640223f953b548617ed8a6" } ], "title": "mptcp: handle consistently DSS corruption", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "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": { "id": "CVE-2024-50185", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2025-10-01T20:18:40.879898Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "description": "CWE-noinfo Not enough information" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T20:27:09.280Z" } }, { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html" }, { "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T22:26:37.356Z" } } ] } }