{"id":"CVE-2024-54191","summary":"Bluetooth: iso: Fix circular lock in iso_conn_big_sync","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: iso: Fix circular lock in iso_conn_big_sync\n\nThis fixes the circular locking dependency warning below, by reworking\niso_sock_recvmsg, to ensure that the socket lock is always released\nbefore calling a function that locks hdev.\n\n[  561.670344] ======================================================\n[  561.670346] WARNING: possible circular locking dependency detected\n[  561.670349] 6.12.0-rc6+ #26 Not tainted\n[  561.670351] ------------------------------------------------------\n[  561.670353] iso-tester/3289 is trying to acquire lock:\n[  561.670355] ffff88811f600078 (&hdev-\u003elock){+.+.}-{3:3},\n               at: iso_conn_big_sync+0x73/0x260 [bluetooth]\n[  561.670405]\n               but task is already holding lock:\n[  561.670407] ffff88815af58258 (sk_lock-AF_BLUETOOTH){+.+.}-{0:0},\n               at: iso_sock_recvmsg+0xbf/0x500 [bluetooth]\n[  561.670450]\n               which lock already depends on the new lock.\n\n[  561.670452]\n               the existing dependency chain (in reverse order) is:\n[  561.670453]\n               -\u003e #2 (sk_lock-AF_BLUETOOTH){+.+.}-{0:0}:\n[  561.670458]        lock_acquire+0x7c/0xc0\n[  561.670463]        lock_sock_nested+0x3b/0xf0\n[  561.670467]        bt_accept_dequeue+0x1a5/0x4d0 [bluetooth]\n[  561.670510]        iso_sock_accept+0x271/0x830 [bluetooth]\n[  561.670547]        do_accept+0x3dd/0x610\n[  561.670550]        __sys_accept4+0xd8/0x170\n[  561.670553]        __x64_sys_accept+0x74/0xc0\n[  561.670556]        x64_sys_call+0x17d6/0x25f0\n[  561.670559]        do_syscall_64+0x87/0x150\n[  561.670563]        entry_SYSCALL_64_after_hwframe+0x76/0x7e\n[  561.670567]\n               -\u003e #1 (sk_lock-AF_BLUETOOTH-BTPROTO_ISO){+.+.}-{0:0}:\n[  561.670571]        lock_acquire+0x7c/0xc0\n[  561.670574]        lock_sock_nested+0x3b/0xf0\n[  561.670577]        iso_sock_listen+0x2de/0xf30 [bluetooth]\n[  561.670617]        __sys_listen_socket+0xef/0x130\n[  561.670620]        __x64_sys_listen+0xe1/0x190\n[  561.670623]        x64_sys_call+0x2517/0x25f0\n[  561.670626]        do_syscall_64+0x87/0x150\n[  561.670629]        entry_SYSCALL_64_after_hwframe+0x76/0x7e\n[  561.670632]\n               -\u003e #0 (&hdev-\u003elock){+.+.}-{3:3}:\n[  561.670636]        __lock_acquire+0x32ad/0x6ab0\n[  561.670639]        lock_acquire.part.0+0x118/0x360\n[  561.670642]        lock_acquire+0x7c/0xc0\n[  561.670644]        __mutex_lock+0x18d/0x12f0\n[  561.670647]        mutex_lock_nested+0x1b/0x30\n[  561.670651]        iso_conn_big_sync+0x73/0x260 [bluetooth]\n[  561.670687]        iso_sock_recvmsg+0x3e9/0x500 [bluetooth]\n[  561.670722]        sock_recvmsg+0x1d5/0x240\n[  561.670725]        sock_read_iter+0x27d/0x470\n[  561.670727]        vfs_read+0x9a0/0xd30\n[  561.670731]        ksys_read+0x1a8/0x250\n[  561.670733]        __x64_sys_read+0x72/0xc0\n[  561.670736]        x64_sys_call+0x1b12/0x25f0\n[  561.670738]        do_syscall_64+0x87/0x150\n[  561.670741]        entry_SYSCALL_64_after_hwframe+0x76/0x7e\n[  561.670744]\n               other info that might help us debug this:\n\n[  561.670745] Chain exists of:\n&hdev-\u003elock --\u003e sk_lock-AF_BLUETOOTH-BTPROTO_ISO --\u003e sk_lock-AF_BLUETOOTH\n\n[  561.670751]  Possible unsafe locking scenario:\n\n[  561.670753]        CPU0                    CPU1\n[  561.670754]        ----                    ----\n[  561.670756]   lock(sk_lock-AF_BLUETOOTH);\n[  561.670758]                                lock(sk_lock\n                                              AF_BLUETOOTH-BTPROTO_ISO);\n[  561.670761]                                lock(sk_lock-AF_BLUETOOTH);\n[  561.670764]   lock(&hdev-\u003elock);\n[  561.670767]\n                *** DEADLOCK ***","modified":"2026-05-18T05:56:11.163517290Z","published":"2025-01-11T12:29:52.753Z","related":["USN-7379-2","USN-7380-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/54xxx/CVE-2024-54191.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/7a17308c17880d259105f6e591eb1bc77b9612f0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cbe640d6cae590b9a7d81ce86fe9a90e83eec1d5"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/54xxx/CVE-2024-54191.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-54191"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"1360e5b6ce63d63d23223a659ca2bbafa30a53aa"},{"fixed":"cbe640d6cae590b9a7d81ce86fe9a90e83eec1d5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"07a9342b94a91b306ed1cf6aa8254aea210764c9"},{"fixed":"7a17308c17880d259105f6e591eb1bc77b9612f0"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"bfec1e55314896bf4a4cfdb3a9ad4872be9f06ed"}]}],"versions":["v6.12.5","v6.12.4","v6.12.3","v6.12.2","v6.11.10","v6.11.9","v6.11.8","v6.11.7","v6.11.6","v6.11.5","v6.11.4","v6.11-rc1","v6.11.3","v6.11-rc5","v6.11.2","v6.11","v6.11.1","v6.11-rc7","v6.10-rc1","v6.11-rc6","v6.11-rc3","v6.11-rc4","v6.11-rc2","v6.10","v6.10-rc6","v6.10-rc7","v6.10-rc3","v6.9-rc1","v6.10-rc5","v6.10-rc2","v6.10-rc4","v6.9","v6.9-rc6","v6.9-rc7","v6.9-rc5","v6.9-rc3","v6.9-rc2","v6.8","v6.9-rc4","v6.8-rc1","v6.7-rc1","v6.8-rc7","v6.8-rc6","v6.8-rc5","v6.8-rc4","v6.8-rc3","v6.8-rc2","v6.7","v6.7-rc3","v6.7-rc8","v6.7-rc7","v6.7-rc6","v6.7-rc2","v6.7-rc4","v6.7-rc5","v6.6","v6.6-rc1","v6.6-rc5","v6.6-rc3","v6.6-rc7","v6.6-rc6","v6.6-rc4","v6.6-rc2","v6.5","v6.5-rc1","v6.5-rc2","v6.5-rc7","v6.5-rc4","v6.5-rc3","v6.5-rc6","v6.5-rc5","v6.4","v6.4-rc7","v6.4-rc1","v6.4-rc6","v6.4-rc5","v6.4-rc3","v6.4-rc4","v6.4-rc2","v6.3","v6.3-rc1","v6.3-rc7","v6.3-rc2","v6.3-rc3","v6.3-rc5","v6.3-rc6","v6.3-rc4","v6.2-rc6","v6.2-rc1","v6.2","v6.2-rc2","v6.2-rc8","v6.2-rc5","v6.2-rc4","v6.2-rc7","v6.2-rc3","v6.1-rc1","v6.1","v6.1-rc8","v6.1-rc3","v6.1-rc6","v6.1-rc7","v6.1-rc4","v6.1-rc2","v6.1-rc5","v6.0-rc1","v6.0","v6.0-rc7","v6.0-rc3","v6.0-rc2","v6.0-rc6","v6.0-rc4","v6.0-rc5","v5.19","v5.19-rc1","v5.19-rc5","v5.19-rc8","v5.19-rc6","v5.18","v5.19-rc2","v5.19-rc7","v5.19-rc3","v5.19-rc4","v5.18-rc1","v5.18-rc7","v5.18-rc2","v5.18-rc5","v5.17","v5.18-rc4","v5.18-rc3","v5.18-rc6","v5.17-rc6","v5.17-rc4","v5.17-rc8","v5.17-rc7","v5.17-rc1","v5.17-rc3","v5.17-rc2","v5.17-rc5","v5.16","v5.16-rc1","v5.16-rc8","v5.16-rc5","v5.16-rc6","v5.16-rc7","v5.16-rc3","v5.16-rc2","v5.16-rc4","v5.15","v5.15-rc2","v5.15-rc1","v5.15-rc4","v5.15-rc7","v5.15-rc3","v5.15-rc5","v5.15-rc6","v5.14","v5.14-rc3","v5.14-rc1","v5.14-rc2","v5.14-rc7","v5.14-rc6","v5.13-rc1","v5.14-rc5","v5.14-rc4","v5.13","v5.13-rc6","v5.13-rc7","v5.13-rc3","v5.13-rc2","v5.13-rc4","v5.13-rc5","v5.12","v5.12-rc2","v5.12-rc1-dontuse","v5.12-rc1","v5.12-rc8","v5.12-rc3","v5.12-rc7","v5.12-rc5","v5.12-rc6","v5.12-rc4","v5.10","v5.11","v5.11-rc3","v5.11-rc7","v5.11-rc6","v5.11-rc5","v5.11-rc1","v5.11-rc4","v5.11-rc2","v5.10-rc1","v5.10-rc7","v5.10-rc4","v5.10-rc3","v5.10-rc6","v5.9","v5.10-rc2","v5.10-rc5","v5.9-rc1","v5.9-rc7","v5.9-rc8","v5.9-rc6","v5.9-rc4","v5.9-rc5","v5.9-rc3","v5.9-rc2","v5.8","v5.7","v5.8-rc2","v5.8-rc1","v5.8-rc7","v5.8-rc5","v5.8-rc3","v5.8-rc4","v5.8-rc6","v5.7-rc4","v5.7-rc7","v5.7-rc1","v5.7-rc3","v5.7-rc2","v5.7-rc5","v5.7-rc6","v5.6","v5.6-rc1","v5.6-rc7","v5.6-rc6","v5.6-rc3","v5.6-rc4","v5.6-rc2","v5.6-rc5","v5.5","v5.5-rc5","v5.5-rc7","v5.5-rc2","v5.5-rc1","v5.4","v5.5-rc4","v5.5-rc3","v5.5-rc6","v5.4-rc1","v5.4-rc6","v5.4-rc3","v5.4-rc4","v5.4-rc8","v5.4-rc7","v5.4-rc5","v5.3","v5.4-rc2","v5.3-rc5","v5.3-rc1","v5.3-rc2","v5.3-rc3","v5.3-rc8","v5.3-rc7","v5.3-rc4","v5.2","v5.3-rc6","v5.2-rc2","v5.2-rc7","v5.2-rc4","v5.2-rc1","v5.2-rc5","v5.2-rc6","v5.2-rc3","v5.1","v5.0-rc8","v5.1-rc7","v5.1-rc1","v5.1-rc6","v5.1-rc5","v5.0","v5.1-rc3","v5.1-rc2","v5.1-rc4","v5.0-rc1","v5.0-rc4","v5.0-rc3","v5.0-rc6","v5.0-rc7","v5.0-rc2","v5.0-rc5","v4.20-rc1","v4.19","v4.20","v4.20-rc7","v4.20-rc5","v4.20-rc6","v4.20-rc4","v4.20-rc2","v4.20-rc3","v4.19-rc2","v4.19-rc8","v4.19-rc4","v4.19-rc1","v4.19-rc7","v4.19-rc6","v4.19-rc5","v4.19-rc3","v4.18","v4.18-rc1","v4.18-rc8","v4.18-rc2","v4.18-rc5","v4.18-rc6","v4.18-rc7","v4.17","v4.18-rc3","v4.18-rc4","v4.17-rc1","v4.17-rc2","v4.17-rc7","v4.17-rc3","v4.17-rc4","v4.16","v4.17-rc6","v4.17-rc5","v4.16-rc7","v4.16-rc4","v4.16-rc1","v4.16-rc2","v4.16-rc5","v4.16-rc3","v4.16-rc6","v4.14","v4.15","v4.15-rc1","v4.15-rc4"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