{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2024-26781", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2024-26781", "idYear": 2024, "status": "PUBLISHED", "publishedAt": "2024-04-04T08:20:15.775Z", "updatedAt": "2026-05-11T20:04:03.326Z", "importedAt": "2026-10-24T01:57:07.518Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "mptcp: fix possible deadlock in subflow diag", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: fix possible deadlock in subflow diag\n\nSyzbot and Eric reported a lockdep splat in the subflow diag:\n\n WARNING: possible circular locking dependency detected\n 6.8.0-rc4-syzkaller-00212-g40b9385dd8e6 #0 Not tainted\n\n syz-executor.2/24141 is trying to acquire lock:\n ffff888045870130 (k-sk_lock-AF_INET6){+.+.}-{0:0}, at:\n tcp_diag_put_ulp net/ipv4/tcp_diag.c:100 [inline]\n ffff888045870130 (k-sk_lock-AF_INET6){+.+.}-{0:0}, at:\n tcp_diag_get_aux+0x738/0x830 net/ipv4/tcp_diag.c:137\n\n but task is already holding lock:\n ffffc9000135e488 (&h->lhash2[i].lock){+.+.}-{2:2}, at: spin_lock\n include/linux/spinlock.h:351 [inline]\n ffffc9000135e488 (&h->lhash2[i].lock){+.+.}-{2:2}, at:\n inet_diag_dump_icsk+0x39f/0x1f80 net/ipv4/inet_diag.c:1038\n\n which lock already depends on the new lock.\n\n the existing dependency chain (in reverse order) is:\n\n -> #1 (&h->lhash2[i].lock){+.+.}-{2:2}:\n lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754\n __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]\n _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154\n spin_lock include/linux/spinlock.h:351 [inline]\n __inet_hash+0x335/0xbe0 net/ipv4/inet_hashtables.c:743\n inet_csk_listen_start+0x23a/0x320 net/ipv4/inet_connection_sock.c:1261\n __inet_listen_sk+0x2a2/0x770 net/ipv4/af_inet.c:217\n inet_listen+0xa3/0x110 net/ipv4/af_inet.c:239\n rds_tcp_listen_init+0x3fd/0x5a0 net/rds/tcp_listen.c:316\n rds_tcp_init_net+0x141/0x320 net/rds/tcp.c:577\n ops_init+0x352/0x610 net/core/net_namespace.c:136\n __register_pernet_operations net/core/net_namespace.c:1214 [inline]\n register_pernet_operations+0x2cb/0x660 net/core/net_namespace.c:1283\n register_pernet_device+0x33/0x80 net/core/net_namespace.c:1370\n rds_tcp_init+0x62/0xd0 net/rds/tcp.c:735\n do_one_initcall+0x238/0x830 init/main.c:1236\n do_initcall_level+0x157/0x210 init/main.c:1298\n do_initcalls+0x3f/0x80 init/main.c:1314\n kernel_init_freeable+0x42f/0x5d0 init/main.c:1551\n kernel_init+0x1d/0x2a0 init/main.c:1441\n ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147\n ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242\n\n -> #0 (k-sk_lock-AF_INET6){+.+.}-{0:0}:\n check_prev_add kernel/locking/lockdep.c:3134 [inline]\n check_prevs_add kernel/locking/lockdep.c:3253 [inline]\n validate_chain+0x18ca/0x58e0 kernel/locking/lockdep.c:3869\n __lock_acquire+0x1345/0x1fd0 kernel/locking/lockdep.c:5137\n lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754\n lock_sock_fast include/net/sock.h:1723 [inline]\n subflow_get_info+0x166/0xd20 net/mptcp/diag.c:28\n tcp_diag_put_ulp net/ipv4/tcp_diag.c:100 [inline]\n tcp_diag_get_aux+0x738/0x830 net/ipv4/tcp_diag.c:137\n inet_sk_diag_fill+0x10ed/0x1e00 net/ipv4/inet_diag.c:345\n inet_diag_dump_icsk+0x55b/0x1f80 net/ipv4/inet_diag.c:1061\n __inet_diag_dump+0x211/0x3a0 net/ipv4/inet_diag.c:1263\n inet_diag_dump_compat+0x1c1/0x2d0 net/ipv4/inet_diag.c:1371\n netlink_dump+0x59b/0xc80 net/netlink/af_netlink.c:2264\n __netlink_dump_start+0x5df/0x790 net/netlink/af_netlink.c:2370\n netlink_dump_start include/linux/netlink.h:338 [inline]\n inet_diag_rcv_msg_compat+0x209/0x4c0 net/ipv4/inet_diag.c:1405\n sock_diag_rcv_msg+0xe7/0x410\n netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2543\n sock_diag_rcv+0x2a/0x40 net/core/sock_diag.c:280\n netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline]\n netlink_unicast+0x7ea/0x980 net/netlink/af_netlink.c:1367\n netlink_sendmsg+0xa3b/0xd70 net/netlink/af_netlink.c:1908\n sock_sendmsg_nosec net/socket.c:730 [inline]\n __sock_sendmsg+0x221/0x270 net/socket.c:745\n ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584\n ___sys_sendmsg net/socket.c:2638 [inline]\n __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667\n do_syscall_64+0xf9/0x240\n entry_SYSCALL_64_after_hwframe+0x6f/0x77\n\nAs noted by Eric we can break the lock dependency chain avoid\ndumping \n---truncated---", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "8affdbb3e2ef6b6a3a467b87dc336dc601dc2ed9", "status": "affected", "versionType": "git", "lessThan": "70e5b013538d5e4cb421afed431a5fcd2a5d49ee" }, { "version": "7d6e8d7ee13b876e762b11f4ec210876ab7aec84", "status": "affected", "versionType": "git", "lessThan": "cc32ba2fdf3f8b136619fff551f166ba51ec856d" }, { "version": "71787c665d09a970b9280c285181d3a2d1bf3bb0", "status": "affected", "versionType": "git", "lessThan": "f27d319df055629480b84b9288a502337b6f2a2e" }, { "version": "e074c8297ee421e7ff352404262fe0e042954ab7", "status": "affected", "versionType": "git", "lessThan": "fa8c776f4c323a9fbc8ddf25edcb962083391430" }, { "version": "298ac00da8e6bc2dcd690b45108acbd944c347d3", "status": "affected", "versionType": "git", "lessThan": "d487e7ba1bc7444d5f062c4930ef8436c47c7e63" }, { "version": "b8adb69a7d29c2d33eb327bca66476fb6066516b", "status": "affected", "versionType": "git", "lessThan": "d6a9608af9a75d13243d217f6ce1e30e57d56ffe" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "5.10.211", "status": "affected", "versionType": "semver", "lessThan": "5.10.212" }, { "version": "5.15.150", "status": "affected", "versionType": "semver", "lessThan": "5.15.151" }, { "version": "6.1.80", "status": "affected", "versionType": "semver", "lessThan": "6.1.81" }, { "version": "6.6.19", "status": "affected", "versionType": "semver", "lessThan": "6.6.21" }, { "version": "6.7.7", "status": "affected", "versionType": "semver", "lessThan": "6.7.9" } ] } ] } } }