{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-50070", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-06-18T10:57:27.406Z", "datePublished": "2025-06-18T11:02:15.240Z", "dateUpdated": "2026-08-05T08:57:18.481Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:57:18.481Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: do not queue data on closed subflows\n\nDipanjan reported a syzbot splat at close time:\n\nWARNING: CPU: 1 PID: 10818 at net/ipv4/af_inet.c:153\ninet_sock_destruct+0x6d0/0x8e0 net/ipv4/af_inet.c:153\nModules linked in: uio_ivshmem(OE) uio(E)\nCPU: 1 PID: 10818 Comm: kworker/1:16 Tainted: G OE\n5.19.0-rc6-g2eae0556bb9d #2\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\n1.13.0-1ubuntu1.1 04/01/2014\nWorkqueue: events mptcp_worker\nRIP: 0010:inet_sock_destruct+0x6d0/0x8e0 net/ipv4/af_inet.c:153\nCode: 21 02 00 00 41 8b 9c 24 28 02 00 00 e9 07 ff ff ff e8 34 4d 91\nf9 89 ee 4c 89 e7 e8 4a 47 60 ff e9 a6 fc ff ff e8 20 4d 91 f9 <0f> 0b\ne9 84 fe ff ff e8 14 4d 91 f9 0f 0b e9 d4 fd ff ff e8 08 4d\nRSP: 0018:ffffc9001b35fa78 EFLAGS: 00010246\nRAX: 0000000000000000 RBX: 00000000002879d0 RCX: ffff8881326f3b00\nRDX: 0000000000000000 RSI: ffff8881326f3b00 RDI: 0000000000000002\nRBP: ffff888179662674 R08: ffffffff87e983a0 R09: 0000000000000000\nR10: 0000000000000005 R11: 00000000000004ea R12: ffff888179662400\nR13: ffff888179662428 R14: 0000000000000001 R15: ffff88817e38e258\nFS: 0000000000000000(0000) GS:ffff8881f5f00000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000000020007bc0 CR3: 0000000179592000 CR4: 0000000000150ee0\nCall Trace:\n \n __sk_destruct+0x4f/0x8e0 net/core/sock.c:2067\n sk_destruct+0xbd/0xe0 net/core/sock.c:2112\n __sk_free+0xef/0x3d0 net/core/sock.c:2123\n sk_free+0x78/0xa0 net/core/sock.c:2134\n sock_put include/net/sock.h:1927 [inline]\n __mptcp_close_ssk+0x50f/0x780 net/mptcp/protocol.c:2351\n __mptcp_destroy_sock+0x332/0x760 net/mptcp/protocol.c:2828\n mptcp_worker+0x5d2/0xc90 net/mptcp/protocol.c:2586\n process_one_work+0x9cc/0x1650 kernel/workqueue.c:2289\n worker_thread+0x623/0x1070 kernel/workqueue.c:2436\n kthread+0x2e9/0x3a0 kernel/kthread.c:376\n ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302\n \n\nThe root cause of the problem is that an mptcp-level (re)transmit can\nrace with mptcp_close() and the packet scheduler checks the subflow\nstate before acquiring the socket lock: we can try to (re)transmit on\nan already closed ssk.\n\nFix the issue checking again the subflow socket status under the\nsubflow socket lock protection. Additionally add the missing check\nfor the fallback-to-tcp case." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The bug is triggered through local MPTCP socket operations (send/retransmit racing with close) on IPPROTO_MPTCP sockets, not by processing unsolicited remote packets alone; an unprivileged process can exercise it over loopback.\nAC:L - The attacker controls both sides of the race by opening an MPTCP connection, queuing data to force (re)transmit, and closing while the scheduler has checked subflow state but not yet locked the subflow, so success does not depend on external conditions.\nPR:L - Creating and using MPTCP sockets requires only an unprivileged local user when CONFIG_MPTCP is enabled (sysctl defaults to enabled); no CAP_NET_ADMIN or real root is required.\nUI:N - Exploitation uses the attacker’s own socket syscalls and does not require any separate victim user action.\nS:U - Impact remains within the local kernel’s MPTCP/TCP socket authority; there is no VM escape, IOMMU bypass, or other cross-boundary scope change.\nC:H - Queuing SKBs onto a closed/tearing-down subflow corrupts socket memory accounting and is a teardown race of the class that can yield use-after-free style read primitives; when uncertain, confidentiality is scored High.\nI:H - The same closed-subflow enqueue race can leave inconsistent write-queue/wmem state and is reasonably treated as exploitable memory corruption for integrity/control-flow impact; when uncertain, integrity is scored High.\nA:H - The demonstrated result is a kernel WARN_ON in inet_sock_destruct during subflow destroy (and can panic under panic_on_warn), which is a High availability impact." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/mptcp/protocol.c", "net/mptcp/protocol.h" ], "versions": [ { "version": "d5f49190def61c47b2faff170ba8fbc48bac4371", "lessThan": "fb9c73ef2ac2ec816efdc8b9267bc04e1369c20b", "status": "affected", "versionType": "git" }, { "version": "d5f49190def61c47b2faff170ba8fbc48bac4371", "lessThan": "8caf5c15b5288d52d9c89374d6c10fa32ee84ec5", "status": "affected", "versionType": "git" }, { "version": "d5f49190def61c47b2faff170ba8fbc48bac4371", "lessThan": "c886d70286bf3ad411eb3d689328a67f7102c6ae", "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/protocol.c", "net/mptcp/protocol.h" ], "versions": [ { "version": "5.10", "status": "affected" }, { "version": "0", "lessThan": "5.10", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.190", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.19.4", "lessThanOrEqual": "5.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0", "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": "5.15.190" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "5.19.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "6.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/fb9c73ef2ac2ec816efdc8b9267bc04e1369c20b" }, { "url": "https://git.kernel.org/stable/c/8caf5c15b5288d52d9c89374d6c10fa32ee84ec5" }, { "url": "https://git.kernel.org/stable/c/c886d70286bf3ad411eb3d689328a67f7102c6ae" } ], "title": "mptcp: do not queue data on closed subflows", "x_generator": { "engine": "bippy-1.2.0" } } } }