{"id":"DEBIAN-CVE-2026-80666","details":"In the Linux kernel, the following vulnerability has been resolved:  Bluetooth: sco: Fix a race condition in sco_sock_timeout()  sco_sock_timeout() runs asynchronously and lock_sock(sk). If the socket is closing while the timer is running, it holds the same lock (lock_sock(sk)) twice, leading to a deadlock.  CPU 0                      CPU 1 ====================       ====================== sco_sock_close()                            sco_sock_timeout() lock_sock(sk) // \u003c-- LOCK   __sco_sock_close()     sco_chan_del()       sco_conn_put() \t      sco_conn_free() \t        disable_delayed_work_sync() \t                           lock(sk) // \u003c-- SAME LOCK  Fix this by moving disable_delayed_work_sync() outside of lock_sock(sk), ensuring that no lock_sock(sk) is held before sco_sock_timeout().  Lockdep splat:  WARNING: possible circular locking dependency detected 6.13.0-rc4 #7 Not tainted  syz-executor292/9514 is trying to acquire lock: ffff8881115d5070 ((work_completion)(&(&conn-\u003etimeout_work)-\u003ework)){+.+.}-{0:0}, at: rcu_lock_acquire sect/v6.13-rc4/./include/linux/rcupdate.h:337 [inline] ffff8881115d5070 ((work_completion)(&(&conn-\u003etimeout_work)-\u003ework)){+.+.}-{0:0}, at: rcu_read_lock sect/v6.13-rc4/./include/linux/rcupdate.h:849 [inline] ffff8881115d5070 ((work_completion)(&(&conn-\u003etimeout_work)-\u003ework)){+.+.}-{0:0}, at: start_flush_work sect/v6.13-rc4/kernel/workqueue.c:4137 [inline] ffff8881115d5070 ((work_completion)(&(&conn-\u003etimeout_work)-\u003ework)){+.+.}-{0:0}, at: __flush_work+0xd1/0xc40 sect/v6.13-rc4/kernel/workqueue.c:4195  but task is already holding lock: ffff88807db3a258 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: lock_sock sect/v6.13-rc4/./include/net/sock.h:1623 [inline] ffff88807db3a258 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: sco_sock_close+0x25/0x100 sect/v6.13-rc4/net/bluetooth/sco.c:524  which lock already depends on the new lock.  the existing dependency chain (in reverse order) is:  -\u003e #1 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}:        lock_acquire+0x1c4/0x520 sect/v6.13-rc4/kernel/locking/lockdep.c:5849        lock_sock_nested+0x48/0x130 sect/v6.13-rc4/net/core/sock.c:3622        lock_sock sect/v6.13-rc4/./include/net/sock.h:1623 [inline]        sco_sock_timeout+0xbe/0x270 sect/v6.13-rc4/net/bluetooth/sco.c:158        process_one_work sect/v6.13-rc4/kernel/workqueue.c:3229 [inline]        process_scheduled_works+0xa99/0x18f0 sect/v6.13-rc4/kernel/workqueue.c:3310        worker_thread+0x8a9/0xd80 sect/v6.13-rc4/kernel/workqueue.c:3391        kthread+0x2c6/0x360 sect/v6.13-rc4/kernel/kthread.c:389        ret_from_fork+0x4e/0x80 sect/v6.13-rc4/arch/x86/kernel/process.c:147        ret_from_fork_asm+0x1a/0x30 sect/v6.13-rc4/arch/x86/entry/entry_64.S:244  -\u003e #0 ((work_completion)(&(&conn-\u003etimeout_work)-\u003ework)){+.+.}-{0:0}:        check_prev_add sect/v6.13-rc4/kernel/locking/lockdep.c:3161 [inline]        check_prevs_add sect/v6.13-rc4/kernel/locking/lockdep.c:3280 [inline]        validate_chain+0x1888/0x5760 sect/v6.13-rc4/kernel/locking/lockdep.c:3904        __lock_acquire+0x13b4/0x2120 sect/v6.13-rc4/kernel/locking/lockdep.c:5226        lock_acquire+0x1c4/0x520 sect/v6.13-rc4/kernel/locking/lockdep.c:5849        touch_work_lockdep_map sect/v6.13-rc4/kernel/workqueue.c:3909 [inline]        start_flush_work sect/v6.13-rc4/kernel/workqueue.c:4163 [inline]        __flush_work+0x70f/0xc40 sect/v6.13-rc4/kernel/workqueue.c:4195        __cancel_work_sync sect/v6.13-rc4/kernel/workqueue.c:4351 [inline]        disable_delayed_work_sync+0xbb/0xf0 sect/v6.13-rc4/kernel/workqueue.c:4514        sco_conn_free sect/v6.13-rc4/net/bluetooth/sco.c:95 [inline]        kref_put sect/v6.13-rc4/./include/linux/kref.h:65 [inline]        sco_conn_put+0x18f/0x270 sect/v6.13-rc4/net/bluetooth/sco.c:107        sco_chan_del+0xe2/0x210 sect/v6.13-rc4/net/bluetooth/sco.c:236        sco_sock_close+0x8f/0x100 sect/v6.13-rc4/net/bluetooth/sco.c:526        sco_sock_release+0x62/0x2d0 sect/v6.13-rc4/net/blueto ---truncated---","modified":"2026-09-14T16:47:47.614868073Z","published":"2026-08-28T08:16:51.847Z","upstream":["CVE-2026-80666"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-80666"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.1.5-1"}]}],"versions":["6.12.100-1","6.12.101-1","6.12.105-1","6.12.107-1","6.12.38-1","6.12.41-1","6.12.43-1","6.12.43-1~bpo12+1","6.12.48-1","6.12.57-1","6.12.57-1~bpo12+1","6.12.63-1","6.12.63-1~bpo12+1","6.12.69-1","6.12.69-1~bpo12+1","6.12.73-1","6.12.73-1~bpo12+1","6.12.74-1","6.12.74-2","6.12.74-2~bpo12+1","6.12.85-1","6.12.85-1~bpo12+1","6.12.86-1","6.12.86-1~bpo12+1","6.12.88-1","6.12.88-1~bpo12+1","6.12.90-1","6.12.90-1~bpo12+1","6.12.90-2","6.12.90-2~bpo12+1","6.12.94-1","6.12.94-1~bpo12+1","6.12.95-1","6.12.95-1~bpo12+1","6.12.96-1","6.13.10-1~exp1","6.13.11-1~exp1","6.13.2-1~exp1","6.13.3-1~exp1","6.13.4-1~exp1","6.13.5-1~exp1","6.13.6-1~exp1","6.13.7-1~exp1","6.13.8-1~exp1","6.13.9-1~exp1","6.13~rc6-1~exp1","6.13~rc7-1~exp1","6.14.3-1~exp1","6.14.5-1~exp1","6.14.6-1~exp1","6.15-1~exp1","6.15.1-1~exp1","6.15.2-1~exp1","6.15.3-1~exp1","6.15.4-1~exp1","6.15.5-1~exp1","6.15.6-1~exp1","6.15~rc7-1~exp1","6.16-1~exp1","6.16.1-1~exp1","6.16.10-1","6.16.11-1","6.16.12-1","6.16.12-1~bpo13+1","6.16.12-2","6.16.3-1","6.16.3-1~bpo13+1","6.16.5-1","6.16.6-1","6.16.7-1","6.16.8-1","6.16.9-1","6.16~rc7-1~exp1","6.17.10-1","6.17.11-1","6.17.12-1","6.17.13-1","6.17.13-1~bpo13+1","6.17.2-1~exp1","6.17.5-1~exp1","6.17.6-1","6.17.7-1","6.17.7-2","6.17.8-1","6.17.8-1~bpo13+1","6.17.9-1","6.18.1-1~exp1","6.18.10-1","6.18.12-1","6.18.12-1~bpo13+1","6.18.13-1","6.18.14-1","6.18.15-1","6.18.15-1~bpo13+1","6.18.2-1~exp1","6.18.3-1","6.18.5-1","6.18.5-1~bpo13+1","6.18.8-1","6.18.9-1","6.18.9-1~bpo13+1","6.18~rc4-1~exp1","6.18~rc4-1~exp2","6.18~rc5-1~exp1","6.18~rc6-1~exp1","6.18~rc7-1~exp1","6.19-1~exp1","6.19.10-1","6.19.10-1~bpo13+1","6.19.11-1","6.19.11-1~bpo13+1","6.19.12-1","6.19.13-1","6.19.13-1~bpo13+1","6.19.14-1","6.19.14-1~bpo13+1","6.19.2-1~exp1","6.19.3-1~exp1","6.19.4-1~exp1","6.19.5-1~exp1","6.19.6-1","6.19.6-2","6.19.6-2~bpo13+1","6.19.8-1","6.19.8-1~bpo13+1","6.19~rc4-1~exp1","6.19~rc5-1~exp1","6.19~rc6-1~exp1","6.19~rc7-1~exp1","6.19~rc8-1~exp1","7.0-1~exp1","7.0.1-1~exp1","7.0.10-1","7.0.10-1~bpo13+1","7.0.12-1","7.0.12-2","7.0.12-2~bpo13+1","7.0.13-1","7.0.13-1~bpo13+1","7.0.14-1","7.0.3-1","7.0.4-1","7.0.4-1~bpo13+1","7.0.7-1","7.0.7-1~bpo13+1","7.0.9-1","7.0.9-1~bpo13+1","7.1.1-1~exp1","7.1.2-1~exp1","7.1.3-1","7.1.3-1+sunvdc","7.1.3-1~bpo13+1","7.1.4-1","7.1~rc2-1~exp1","7.1~rc3-1~exp1","7.1~rc4-1~exp1","7.1~rc4-1~exp2","7.1~rc5-1~exp1","7.1~rc7-1~exp1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-80666.json"}}],"schema_version":"1.9.0"}