{"cve":"CVE-2024-54191","nvd":{"published":"2025-01-11T13:15:26.667","modified":"2026-06-17T08:09:54.513","status":"Modified","description":"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->lock){+.+.}-{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               -> #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               -> #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               -> #0 (&hdev->lock){+.+.}-{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->lock --> sk_lock-AF_BLUETOOTH-BTPROTO_ISO --> 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->lock);\n[  561.670767]\n                *** DEADLOCK ***","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-667"],"references":["https://git.kernel.org/stable/c/7a17308c17880d259105f6e591eb1bc77b9612f0","https://git.kernel.org/stable/c/cbe640d6cae590b9a7d81ce86fe9a90e83eec1d5"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:58:20.756570362+00:00"},"epss":{"cve":"CVE-2024-54191","score":0.0014,"percentile":0.03318,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}