cve-2024-26732
Vulnerability from cvelistv5
Published
2024-04-03 17:00
Modified
2024-12-19 08:46
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net: implement lockless setsockopt(SO_PEEK_OFF) syzbot reported a lockdep violation [1] involving af_unix support of SO_PEEK_OFF. Since SO_PEEK_OFF is inherently not thread safe (it uses a per-socket sk_peek_off field), there is really no point to enforce a pointless thread safety in the kernel. After this patch : - setsockopt(SO_PEEK_OFF) no longer acquires the socket lock. - skb_consume_udp() no longer has to acquire the socket lock. - af_unix no longer needs a special version of sk_set_peek_off(), because it does not lock u->iolock anymore. As a followup, we could replace prot->set_peek_off to be a boolean and avoid an indirect call, since we always use sk_set_peek_off(). [1] WARNING: possible circular locking dependency detected 6.8.0-rc4-syzkaller-00267-g0f1dd5e91e2b #0 Not tainted syz-executor.2/30025 is trying to acquire lock: ffff8880765e7d80 (&u->iolock){+.+.}-{3:3}, at: unix_set_peek_off+0x26/0xa0 net/unix/af_unix.c:789 but task is already holding lock: ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1691 [inline] ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sockopt_lock_sock net/core/sock.c:1060 [inline] ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sk_setsockopt+0xe52/0x3360 net/core/sock.c:1193 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (sk_lock-AF_UNIX){+.+.}-{0:0}: lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754 lock_sock_nested+0x48/0x100 net/core/sock.c:3524 lock_sock include/net/sock.h:1691 [inline] __unix_dgram_recvmsg+0x1275/0x12c0 net/unix/af_unix.c:2415 sock_recvmsg_nosec+0x18e/0x1d0 net/socket.c:1046 ____sys_recvmsg+0x3c0/0x470 net/socket.c:2801 ___sys_recvmsg net/socket.c:2845 [inline] do_recvmmsg+0x474/0xae0 net/socket.c:2939 __sys_recvmmsg net/socket.c:3018 [inline] __do_sys_recvmmsg net/socket.c:3041 [inline] __se_sys_recvmmsg net/socket.c:3034 [inline] __x64_sys_recvmmsg+0x199/0x250 net/socket.c:3034 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 -> #0 (&u->iolock){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain+0x18ca/0x58e0 kernel/locking/lockdep.c:3869 __lock_acquire+0x1345/0x1fd0 kernel/locking/lockdep.c:5137 lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752 unix_set_peek_off+0x26/0xa0 net/unix/af_unix.c:789 sk_setsockopt+0x207e/0x3360 do_sock_setsockopt+0x2fb/0x720 net/socket.c:2307 __sys_setsockopt+0x1ad/0x250 net/socket.c:2334 __do_sys_setsockopt net/socket.c:2343 [inline] __se_sys_setsockopt net/socket.c:2340 [inline] __x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2340 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(sk_lock-AF_UNIX); lock(&u->iolock); lock(sk_lock-AF_UNIX); lock(&u->iolock); *** DEADLOCK *** 1 lock held by syz-executor.2/30025: #0: ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1691 [inline] #0: ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sockopt_lock_sock net/core/sock.c:1060 [inline] #0: ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sk_setsockopt+0xe52/0x3360 net/core/sock.c:1193 stack backtrace: CPU: 0 PID: 30025 Comm: syz-executor.2 Not tainted 6.8.0-rc4-syzkaller-00267-g0f1dd5e91e2b #0 Hardware name: Google Google C ---truncated---
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/56667da7399eb19af857e30f41bea89aa6fa812cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/897f75e2cde8a5f9f7529b55249af1fa4248c83bPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/56667da7399eb19af857e30f41bea89aa6fa812cPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/897f75e2cde8a5f9f7529b55249af1fa4248c83bPatch
Impacted products
Vendor Product Version
Linux Linux Version: 859051dd165ec6cc915f0f2114699021144fd249
Version: 859051dd165ec6cc915f0f2114699021144fd249
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   Linux Linux Version: 6.7
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                        id: "CVE-2024-26732",
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               lang: "en",
               value: "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: implement lockless setsockopt(SO_PEEK_OFF)\n\nsyzbot reported a lockdep violation [1] involving af_unix\nsupport of SO_PEEK_OFF.\n\nSince SO_PEEK_OFF is inherently not thread safe (it uses a per-socket\nsk_peek_off field), there is really no point to enforce a pointless\nthread safety in the kernel.\n\nAfter this patch :\n\n- setsockopt(SO_PEEK_OFF) no longer acquires the socket lock.\n\n- skb_consume_udp() no longer has to acquire the socket lock.\n\n- af_unix no longer needs a special version of sk_set_peek_off(),\n  because it does not lock u->iolock anymore.\n\nAs a followup, we could replace prot->set_peek_off to be a boolean\nand avoid an indirect call, since we always use sk_set_peek_off().\n\n[1]\n\nWARNING: possible circular locking dependency detected\n6.8.0-rc4-syzkaller-00267-g0f1dd5e91e2b #0 Not tainted\n\nsyz-executor.2/30025 is trying to acquire lock:\n ffff8880765e7d80 (&u->iolock){+.+.}-{3:3}, at: unix_set_peek_off+0x26/0xa0 net/unix/af_unix.c:789\n\nbut task is already holding lock:\n ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1691 [inline]\n ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sockopt_lock_sock net/core/sock.c:1060 [inline]\n ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sk_setsockopt+0xe52/0x3360 net/core/sock.c:1193\n\nwhich lock already depends on the new lock.\n\nthe existing dependency chain (in reverse order) is:\n\n-> #1 (sk_lock-AF_UNIX){+.+.}-{0:0}:\n        lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754\n        lock_sock_nested+0x48/0x100 net/core/sock.c:3524\n        lock_sock include/net/sock.h:1691 [inline]\n        __unix_dgram_recvmsg+0x1275/0x12c0 net/unix/af_unix.c:2415\n        sock_recvmsg_nosec+0x18e/0x1d0 net/socket.c:1046\n        ____sys_recvmsg+0x3c0/0x470 net/socket.c:2801\n        ___sys_recvmsg net/socket.c:2845 [inline]\n        do_recvmmsg+0x474/0xae0 net/socket.c:2939\n        __sys_recvmmsg net/socket.c:3018 [inline]\n        __do_sys_recvmmsg net/socket.c:3041 [inline]\n        __se_sys_recvmmsg net/socket.c:3034 [inline]\n        __x64_sys_recvmmsg+0x199/0x250 net/socket.c:3034\n       do_syscall_64+0xf9/0x240\n       entry_SYSCALL_64_after_hwframe+0x6f/0x77\n\n-> #0 (&u->iolock){+.+.}-{3:3}:\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        __mutex_lock_common kernel/locking/mutex.c:608 [inline]\n        __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752\n        unix_set_peek_off+0x26/0xa0 net/unix/af_unix.c:789\n       sk_setsockopt+0x207e/0x3360\n        do_sock_setsockopt+0x2fb/0x720 net/socket.c:2307\n        __sys_setsockopt+0x1ad/0x250 net/socket.c:2334\n        __do_sys_setsockopt net/socket.c:2343 [inline]\n        __se_sys_setsockopt net/socket.c:2340 [inline]\n        __x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2340\n       do_syscall_64+0xf9/0x240\n       entry_SYSCALL_64_after_hwframe+0x6f/0x77\n\nother info that might help us debug this:\n\n Possible unsafe locking scenario:\n\n       CPU0                    CPU1\n       ----                    ----\n  lock(sk_lock-AF_UNIX);\n                               lock(&u->iolock);\n                               lock(sk_lock-AF_UNIX);\n  lock(&u->iolock);\n\n *** DEADLOCK ***\n\n1 lock held by syz-executor.2/30025:\n  #0: ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1691 [inline]\n  #0: ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sockopt_lock_sock net/core/sock.c:1060 [inline]\n  #0: ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sk_setsockopt+0xe52/0x3360 net/core/sock.c:1193\n\nstack backtrace:\nCPU: 0 PID: 30025 Comm: syz-executor.2 Not tainted 6.8.0-rc4-syzkaller-00267-g0f1dd5e91e2b #0\nHardware name: Google Google C\n---truncated---",
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         title: "net: implement lockless setsockopt(SO_PEEK_OFF)",
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   cveMetadata: {
      assignerOrgId: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      assignerShortName: "Linux",
      cveId: "CVE-2024-26732",
      datePublished: "2024-04-03T17:00:19.722Z",
      dateReserved: "2024-02-19T14:20:24.165Z",
      dateUpdated: "2024-12-19T08:46:04.536Z",
      state: "PUBLISHED",
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      nvd: "{\"cve\":{\"id\":\"CVE-2024-26732\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-04-03T17:15:50.977\",\"lastModified\":\"2025-02-03T16:17:25.537\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: implement lockless setsockopt(SO_PEEK_OFF)\\n\\nsyzbot reported a lockdep violation [1] involving af_unix\\nsupport of SO_PEEK_OFF.\\n\\nSince SO_PEEK_OFF is inherently not thread safe (it uses a per-socket\\nsk_peek_off field), there is really no point to enforce a pointless\\nthread safety in the kernel.\\n\\nAfter this patch :\\n\\n- setsockopt(SO_PEEK_OFF) no longer acquires the socket lock.\\n\\n- skb_consume_udp() no longer has to acquire the socket lock.\\n\\n- af_unix no longer needs a special version of sk_set_peek_off(),\\n  because it does not lock u->iolock anymore.\\n\\nAs a followup, we could replace prot->set_peek_off to be a boolean\\nand avoid an indirect call, since we always use sk_set_peek_off().\\n\\n[1]\\n\\nWARNING: possible circular locking dependency detected\\n6.8.0-rc4-syzkaller-00267-g0f1dd5e91e2b #0 Not tainted\\n\\nsyz-executor.2/30025 is trying to acquire lock:\\n ffff8880765e7d80 (&u->iolock){+.+.}-{3:3}, at: unix_set_peek_off+0x26/0xa0 net/unix/af_unix.c:789\\n\\nbut task is already holding lock:\\n ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1691 [inline]\\n ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sockopt_lock_sock net/core/sock.c:1060 [inline]\\n ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sk_setsockopt+0xe52/0x3360 net/core/sock.c:1193\\n\\nwhich lock already depends on the new lock.\\n\\nthe existing dependency chain (in reverse order) is:\\n\\n-> #1 (sk_lock-AF_UNIX){+.+.}-{0:0}:\\n        lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754\\n        lock_sock_nested+0x48/0x100 net/core/sock.c:3524\\n        lock_sock include/net/sock.h:1691 [inline]\\n        __unix_dgram_recvmsg+0x1275/0x12c0 net/unix/af_unix.c:2415\\n        sock_recvmsg_nosec+0x18e/0x1d0 net/socket.c:1046\\n        ____sys_recvmsg+0x3c0/0x470 net/socket.c:2801\\n        ___sys_recvmsg net/socket.c:2845 [inline]\\n        do_recvmmsg+0x474/0xae0 net/socket.c:2939\\n        __sys_recvmmsg net/socket.c:3018 [inline]\\n        __do_sys_recvmmsg net/socket.c:3041 [inline]\\n        __se_sys_recvmmsg net/socket.c:3034 [inline]\\n        __x64_sys_recvmmsg+0x199/0x250 net/socket.c:3034\\n       do_syscall_64+0xf9/0x240\\n       entry_SYSCALL_64_after_hwframe+0x6f/0x77\\n\\n-> #0 (&u->iolock){+.+.}-{3:3}:\\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        __mutex_lock_common kernel/locking/mutex.c:608 [inline]\\n        __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752\\n        unix_set_peek_off+0x26/0xa0 net/unix/af_unix.c:789\\n       sk_setsockopt+0x207e/0x3360\\n        do_sock_setsockopt+0x2fb/0x720 net/socket.c:2307\\n        __sys_setsockopt+0x1ad/0x250 net/socket.c:2334\\n        __do_sys_setsockopt net/socket.c:2343 [inline]\\n        __se_sys_setsockopt net/socket.c:2340 [inline]\\n        __x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2340\\n       do_syscall_64+0xf9/0x240\\n       entry_SYSCALL_64_after_hwframe+0x6f/0x77\\n\\nother info that might help us debug this:\\n\\n Possible unsafe locking scenario:\\n\\n       CPU0                    CPU1\\n       ----                    ----\\n  lock(sk_lock-AF_UNIX);\\n                               lock(&u->iolock);\\n                               lock(sk_lock-AF_UNIX);\\n  lock(&u->iolock);\\n\\n *** DEADLOCK ***\\n\\n1 lock held by syz-executor.2/30025:\\n  #0: ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1691 [inline]\\n  #0: ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sockopt_lock_sock net/core/sock.c:1060 [inline]\\n  #0: ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sk_setsockopt+0xe52/0x3360 net/core/sock.c:1193\\n\\nstack backtrace:\\nCPU: 0 PID: 30025 Comm: syz-executor.2 Not tainted 6.8.0-rc4-syzkaller-00267-g0f1dd5e91e2b #0\\nHardware name: Google Google C\\n---truncated---\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvió la siguiente vulnerabilidad: net: implementar lockless setsockopt(SO_PEEK_OFF) syzbot informó una violación de lockdep [1] que involucraba el soporte de SO_PEEK_OFF por parte de af_unix. Dado que SO_PEEK_OFF no es inherentemente seguro para subprocesos (utiliza un campo sk_peek_off por socket), realmente no tiene sentido imponer una seguridad de subprocesos inútil en el kernel. Después de este parche: - setsockopt(SO_PEEK_OFF) ya no adquiere el bloqueo del socket. - skb_consume_udp() ya no tiene que adquirir el bloqueo del socket. - af_unix ya no necesita una versión especial de sk_set_peek_off(), porque ya no bloquea u->iolock. Como seguimiento, podríamos reemplazar prot->set_peek_off para que sea booleano y evitar una llamada indirecta, ya que siempre usamos sk_set_peek_off(). [1] ADVERTENCIA: posible dependencia de bloqueo circular detectada 6.8.0-rc4-syzkaller-00267-g0f1dd5e91e2b #0 No contaminado syz-executor.2/30025 está intentando adquirir el bloqueo: ffff8880765e7d80 (&u->iolock){+.+. }-{3:3}, en: unix_set_peek_off+0x26/0xa0 net/unix/af_unix.c:789 pero la tarea ya mantiene el bloqueo: ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, en: lock_sock include/net/sock.h:1691 [en línea] ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, en: sockopt_lock_sock net/core/sock.c:1060 [en línea] ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, en: sk_setsockopt+0xe52/0x3360 net/core/sock.c:1193 cuyo bloqueo ya depende del nuevo bloqueo. la cadena de dependencia existente (en orden inverso) es: -> #1 (sk_lock-AF_UNIX){+.+.}-{0:0}: lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754 lock_sock_nested+0x48 /0x100 net/core/sock.c:3524 lock_sock include/net/sock.h:1691 [en línea] __unix_dgram_recvmsg+0x1275/0x12c0 net/unix/af_unix.c:2415 sock_recvmsg_nosec+0x18e/0x1d0 net/socket.c:1046 ____sys_recvmsg+0x3c0/0x470 net/socket.c:2801 ___sys_recvmsg net/socket.c:2845 [en línea] do_recvmmsg+0x474/0xae0 net/socket.c:2939 __sys_recvmmsg net/socket.c:3018 [en línea] __do_sy s_recvmmsg red/socket .c:3041 [en línea] __se_sys_recvmmsg net/socket.c:3034 [en línea] __x64_sys_recvmmsg+0x199/0x250 net/socket.c:3034 do_syscall_64+0xf9/0x240 Entry_SYSCALL_64_after_hwframe+0x6f/0x77 -> #0 (&u->iolock) {+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3134 [en línea] check_prevs_add kernel/locking/lockdep.c:3253 [en línea] validar_chain+0x18ca/0x58e0 kernel/locking/lockdep. c:3869 __lock_acquire+0x1345/0x1fd0 kernel/locking/lockdep.c:5137 lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754 __mutex_lock_common kernel/locking/mutex.c:608 [en línea] __mutex_lock+0x136/0xd70 kernel /locking/mutex.c:752 unix_set_peek_off+0x26/0xa0 net/unix/af_unix.c:789 sk_setsockopt+0x207e/0x3360 do_sock_setsockopt+0x2fb/0x720 net/socket.c:2307 __sys_setsockopt+0x1ad/0x250 net/ enchufe.c: 2334 __do_sys_setsockopt net/socket.c:2343 [en línea] __se_sys_setsockopt net/socket.c:2340 [en línea] __x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2340 do_syscall_64+0xf9/0x240 entrada_SYSCALL_6 4_after_hwframe+0x6f/0x77 otra información que podría ayudar depuremos esto: Posible escenario de bloqueo inseguro: CPU0 CPU1 ---- ---- lock(sk_lock-AF_UNIX); bloquear(&u->iolock); bloquear(sk_lock-AF_UNIX); bloquear(&u->iolock); *** DEADLOCK *** 1 bloqueo retenido por syz-executor.2/30025: #0: ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, en: lock_sock include/net/sock. h:1691 [en línea] #0: ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, en: sockopt_lock_sock net/core/sock.c:1060 [en línea] #0: ffff8880765e7930 (sk_lock- AF_UNIX){+.+.}-{0:0}, en: sk_setsockopt+0xe52/0x3360 net/core/sock.c:1193 seguimiento de pila: CPU: 0 PID: 30025 Comm: syz-executor.2 No contaminado 6.8 .0-rc4-syzkaller-00267-g0f1dd5e91e2b #0 Nombre del hardware: Google Google C ---truncado---\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-667\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.7.7\",\"matchCriteriaId\":\"575EE16B-67F2-4B5B-B5F8-1877715C898B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.8:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"B9F4EA73-0894-400F-A490-3A397AB7A517\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.8:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"056BD938-0A27-4569-B391-30578B309EE3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.8:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"F02056A5-B362-4370-9FF8-6F0BD384D520\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.8:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"62075ACE-B2A0-4B16-829D-B3DA5AE5CC41\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.8:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"A780F817-2A77-4130-A9B7-5C25606314E3\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/56667da7399eb19af857e30f41bea89aa6fa812c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/897f75e2cde8a5f9f7529b55249af1fa4248c83b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/56667da7399eb19af857e30f41bea89aa6fa812c\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/897f75e2cde8a5f9f7529b55249af1fa4248c83b\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
      vulnrichment: {
         containers: "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/897f75e2cde8a5f9f7529b55249af1fa4248c83b\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/56667da7399eb19af857e30f41bea89aa6fa812c\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-02T00:14:12.930Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-26732\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-06-17T19:28:35.916343Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-06-17T19:28:49.881Z\"}}], \"cna\": {\"title\": \"net: implement lockless setsockopt(SO_PEEK_OFF)\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"859051dd165ec6cc915f0f2114699021144fd249\", \"lessThan\": \"897f75e2cde8a5f9f7529b55249af1fa4248c83b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"859051dd165ec6cc915f0f2114699021144fd249\", \"lessThan\": \"56667da7399eb19af857e30f41bea89aa6fa812c\", \"versionType\": \"git\"}], \"programFiles\": [\"net/core/sock.c\", \"net/ipv4/udp.c\", \"net/unix/af_unix.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.7\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.7\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.7.7\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.7.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/core/sock.c\", \"net/ipv4/udp.c\", \"net/unix/af_unix.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/897f75e2cde8a5f9f7529b55249af1fa4248c83b\"}, {\"url\": \"https://git.kernel.org/stable/c/56667da7399eb19af857e30f41bea89aa6fa812c\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: implement lockless setsockopt(SO_PEEK_OFF)\\n\\nsyzbot reported a lockdep violation [1] involving af_unix\\nsupport of SO_PEEK_OFF.\\n\\nSince SO_PEEK_OFF is inherently not thread safe (it uses a per-socket\\nsk_peek_off field), there is really no point to enforce a pointless\\nthread safety in the kernel.\\n\\nAfter this patch :\\n\\n- setsockopt(SO_PEEK_OFF) no longer acquires the socket lock.\\n\\n- skb_consume_udp() no longer has to acquire the socket lock.\\n\\n- af_unix no longer needs a special version of sk_set_peek_off(),\\n  because it does not lock u->iolock anymore.\\n\\nAs a followup, we could replace prot->set_peek_off to be a boolean\\nand avoid an indirect call, since we always use sk_set_peek_off().\\n\\n[1]\\n\\nWARNING: possible circular locking dependency detected\\n6.8.0-rc4-syzkaller-00267-g0f1dd5e91e2b #0 Not tainted\\n\\nsyz-executor.2/30025 is trying to acquire lock:\\n ffff8880765e7d80 (&u->iolock){+.+.}-{3:3}, at: unix_set_peek_off+0x26/0xa0 net/unix/af_unix.c:789\\n\\nbut task is already holding lock:\\n ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1691 [inline]\\n ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sockopt_lock_sock net/core/sock.c:1060 [inline]\\n ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sk_setsockopt+0xe52/0x3360 net/core/sock.c:1193\\n\\nwhich lock already depends on the new lock.\\n\\nthe existing dependency chain (in reverse order) is:\\n\\n-> #1 (sk_lock-AF_UNIX){+.+.}-{0:0}:\\n        lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754\\n        lock_sock_nested+0x48/0x100 net/core/sock.c:3524\\n        lock_sock include/net/sock.h:1691 [inline]\\n        __unix_dgram_recvmsg+0x1275/0x12c0 net/unix/af_unix.c:2415\\n        sock_recvmsg_nosec+0x18e/0x1d0 net/socket.c:1046\\n        ____sys_recvmsg+0x3c0/0x470 net/socket.c:2801\\n        ___sys_recvmsg net/socket.c:2845 [inline]\\n        do_recvmmsg+0x474/0xae0 net/socket.c:2939\\n        __sys_recvmmsg net/socket.c:3018 [inline]\\n        __do_sys_recvmmsg net/socket.c:3041 [inline]\\n        __se_sys_recvmmsg net/socket.c:3034 [inline]\\n        __x64_sys_recvmmsg+0x199/0x250 net/socket.c:3034\\n       do_syscall_64+0xf9/0x240\\n       entry_SYSCALL_64_after_hwframe+0x6f/0x77\\n\\n-> #0 (&u->iolock){+.+.}-{3:3}:\\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        __mutex_lock_common kernel/locking/mutex.c:608 [inline]\\n        __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752\\n        unix_set_peek_off+0x26/0xa0 net/unix/af_unix.c:789\\n       sk_setsockopt+0x207e/0x3360\\n        do_sock_setsockopt+0x2fb/0x720 net/socket.c:2307\\n        __sys_setsockopt+0x1ad/0x250 net/socket.c:2334\\n        __do_sys_setsockopt net/socket.c:2343 [inline]\\n        __se_sys_setsockopt net/socket.c:2340 [inline]\\n        __x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2340\\n       do_syscall_64+0xf9/0x240\\n       entry_SYSCALL_64_after_hwframe+0x6f/0x77\\n\\nother info that might help us debug this:\\n\\n Possible unsafe locking scenario:\\n\\n       CPU0                    CPU1\\n       ----                    ----\\n  lock(sk_lock-AF_UNIX);\\n                               lock(&u->iolock);\\n                               lock(sk_lock-AF_UNIX);\\n  lock(&u->iolock);\\n\\n *** DEADLOCK ***\\n\\n1 lock held by syz-executor.2/30025:\\n  #0: ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1691 [inline]\\n  #0: ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sockopt_lock_sock net/core/sock.c:1060 [inline]\\n  #0: ffff8880765e7930 (sk_lock-AF_UNIX){+.+.}-{0:0}, at: sk_setsockopt+0xe52/0x3360 net/core/sock.c:1193\\n\\nstack backtrace:\\nCPU: 0 PID: 30025 Comm: syz-executor.2 Not tainted 6.8.0-rc4-syzkaller-00267-g0f1dd5e91e2b #0\\nHardware name: Google Google C\\n---truncated---\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T08:46:04.536Z\"}}}",
         cveMetadata: "{\"cveId\": \"CVE-2024-26732\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T08:46:04.536Z\", \"dateReserved\": \"2024-02-19T14:20:24.165Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-04-03T17:00:19.722Z\", \"assignerShortName\": \"Linux\"}",
         dataType: "CVE_RECORD",
         dataVersion: "5.1",
      },
   },
}


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