CVE-2026-98297

Summary

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_core: Fix queuing tx_work after workqueue is drained

hci_send_acl(), hci_send_sco() and hci_send_iso() queue hdev->tx_work unconditionally. They can run from the L2CAP/SCO/ISO socket send path while hci_dev_close_sync() is draining hdev->workqueue (HCIDEVDOWN racing with a socket write). Since that queue_work() is not chained work from the tx_work worker itself, __queue_work() sees the queue marked __WQ_DRAINING, warns "cannot queue %ps on wq %s", and drops the work:

WARNING: CPU: 1 PID: 5985 at kernel/workqueue.c:2352 __queue_work Call Trace: queue_work_on l2cap_chan_send l2cap_sock_sendmsg …

hci_dev_close_sync() already sets HCI_CMD_DRAIN_WORKQUEUE before draining, but only hci_cmd_work() and handle_cmd_cnt_and_timer() check it before queuing. Route the tx_work producers through the same guard via a shared hci_sched_tx() helper.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux9cebe4680bb9a72f80c6541eb24af06db7a1fbc9 < ab0678a0701ac4de499428dc1b321659bb74d272affected
LinuxLinux47330cc875b36a1cf7b3543cb2cf90a7c603ce0e < e220c1242a643d97102a79f09b7ef3aa31276961affected
LinuxLinux525daaea459fc215f432de1b8debbd9144bf97b0 < cbb325bc150e8c0dbce004ac0e5516bcffc0de31affected
LinuxLinux525daaea459fc215f432de1b8debbd9144bf97b0 < 6610c6fe4b8936c232048e6049bf77c70a6f759caffected
LinuxLinux60bceb9a4c693e68cc90ba4b2dfb9e000e8638ffaffected
LinuxLinux6.12.93 < 6.12.112affected
LinuxLinux6.18.35 < 6.18.54affected
LinuxLinux7.0.12 < 7.1affected
LinuxLinux7.1affected
LinuxLinux0 < 7.1unaffected
LinuxLinux6.12.112 <= 6.12.*unaffected
LinuxLinux6.18.54 <= 6.18.*unaffected
LinuxLinux7.2.8 <= 7.2.*unaffected
LinuxLinux7.3-rc4 <= *unaffected

Weaknesses

References