{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-46858", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-09-11T15:12:18.291Z", "datePublished": "2024-09-27T12:42:49.167Z", "dateUpdated": "2026-08-05T11:39:03.201Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:39:03.201Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: pm: Fix uaf in __timer_delete_sync\n\nThere are two paths to access mptcp_pm_del_add_timer, result in a race\ncondition:\n\n CPU1\t\t\t\tCPU2\n ==== ====\n net_rx_action\n napi_poll netlink_sendmsg\n __napi_poll netlink_unicast\n process_backlog netlink_unicast_kernel\n __netif_receive_skb genl_rcv\n __netif_receive_skb_one_core netlink_rcv_skb\n NF_HOOK genl_rcv_msg\n ip_local_deliver_finish genl_family_rcv_msg\n ip_protocol_deliver_rcu genl_family_rcv_msg_doit\n tcp_v4_rcv mptcp_pm_nl_flush_addrs_doit\n tcp_v4_do_rcv mptcp_nl_remove_addrs_list\n tcp_rcv_established mptcp_pm_remove_addrs_and_subflows\n tcp_data_queue remove_anno_list_by_saddr\n mptcp_incoming_options mptcp_pm_del_add_timer\n mptcp_pm_del_add_timer kfree(entry)\n\nIn remove_anno_list_by_saddr(running on CPU2), after leaving the critical\nzone protected by \"pm.lock\", the entry will be released, which leads to the\noccurrence of uaf in the mptcp_pm_del_add_timer(running on CPU1).\n\nKeeping a reference to add_timer inside the lock, and calling\nsk_stop_timer_sync() with this reference, instead of \"entry->add_timer\".\n\nMove list_del(&entry->list) to mptcp_pm_del_add_timer and inside the pm lock,\ndo not directly access any members of the entry outside the pm lock, which\ncan avoid similar \"entry->x\" uaf." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The use-after-free dereference occurs in the TCP/MPTCP receive path (`mptcp_incoming_options()` → `mptcp_pm_del_add_timer()`), driven entirely by an `ADD_ADDR` echo option in a TCP segment sent by the remote MPTCP peer, executed in softirq context. Any internet-facing MPTCP-enabled endpoint (server or Android/mobile client with a `signal` endpoint configured) processes this attacker-supplied option, so the vulnerable code is reached over the network.\nAC:H - The remote peer can hammer the racing side without limit by repeatedly sending ADD_ADDR echoes, but the freeing side must be executed concurrently by the local path manager (netlink FLUSH_ADDRS/DEL_ADDR, e.g. mptcpd reacting to an interface change), which is timing the attacker cannot influence. Winning that window is a condition beyond the remote attacker's control.\nPR:N - The attacker-controlled side requires only being the peer of an established MPTCP connection to a listening service — no account, credentials, or privileges on the target are needed, and the ADD_ADDR echo is accepted as part of normal protocol processing once the connection is fully established.\nUI:N - No victim action is required; the ADD_ADDR announcement and the peer's echo are automatic protocol behaviour, and the concurrent endpoint flush is performed by a background path-manager daemon rather than an interactive user.\nS:U - The corruption is confined to kernel heap memory within the same security authority; there is no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The freed `mptcp_pm_add_entry` lives in a generic kmalloc cache and can be reclaimed with attacker-shaped data, and the subsequent `timer_delete_sync()`/`__sock_put()` on that stale object gives a foothold for arbitrary kernel memory disclosure, as is standard for slab use-after-free.\nI:H - `__timer_delete_sync()` on the reclaimed object acts on attacker-influenced `timer->flags` and can perform an hlist unlink write (`*pprev = next; next->pprev = pprev`), and the spurious `__sock_put()` underflows the socket refcount — both yield write primitives leveragable for control-flow hijack. The same missing-lock defect also permits a double `kfree()` of the entry from two concurrent netlink removals.\nA:H - The use-after-free reliably produces a KASAN slab-use-after-free / kernel oops in softirq context (as reported by syzbot), and the resulting timer-base list corruption or socket refcount underflow causes a kernel panic." } ] } ], "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" ], "versions": [ { "version": "00cfd77b9063dcdf3628a7087faba60de85a9cc8", "lessThan": "0e7814b028cd50b3ff79659d23dfa9da6a1e75e1", "status": "affected", "versionType": "git" }, { "version": "00cfd77b9063dcdf3628a7087faba60de85a9cc8", "lessThan": "3554482f4691571fc4b5490c17ae26896e62171c", "status": "affected", "versionType": "git" }, { "version": "00cfd77b9063dcdf3628a7087faba60de85a9cc8", "lessThan": "67409b358500c71632116356a0b065f112d7b707", "status": "affected", "versionType": "git" }, { "version": "00cfd77b9063dcdf3628a7087faba60de85a9cc8", "lessThan": "6452b162549c7f9ef54655d3fb9977b9192e6e5b", "status": "affected", "versionType": "git" }, { "version": "00cfd77b9063dcdf3628a7087faba60de85a9cc8", "lessThan": "12134a652b0a10064844ea235173e70246eba6dc", "status": "affected", "versionType": "git" }, { "version": "00cfd77b9063dcdf3628a7087faba60de85a9cc8", "lessThan": "b4cd80b0338945a94972ac3ed54f8338d2da2076", "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" ], "versions": [ { "version": "5.10", "status": "affected" }, { "version": "0", "lessThan": "5.10", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.227", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.168", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.111", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.52", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.10.11", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.11", "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": "5.10", "versionEndExcluding": "5.10.227" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "5.15.168" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.1.111" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.6.52" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.10.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.11" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/0e7814b028cd50b3ff79659d23dfa9da6a1e75e1" }, { "url": "https://git.kernel.org/stable/c/3554482f4691571fc4b5490c17ae26896e62171c" }, { "url": "https://git.kernel.org/stable/c/67409b358500c71632116356a0b065f112d7b707" }, { "url": "https://git.kernel.org/stable/c/6452b162549c7f9ef54655d3fb9977b9192e6e5b" }, { "url": "https://git.kernel.org/stable/c/12134a652b0a10064844ea235173e70246eba6dc" }, { "url": "https://git.kernel.org/stable/c/b4cd80b0338945a94972ac3ed54f8338d2da2076" } ], "title": "mptcp: pm: Fix uaf in __timer_delete_sync", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2024-09-29T13:57:46.692938Z", "id": "CVE-2024-46858", "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": "2024-09-29T13:57:52.178Z" } }, { "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": "2025-11-03T22:19:44.734Z" } } ] } }