Description

In the Linux kernel, the following vulnerability has been resolved: bluetooth/l2cap: sync sock recv cb and release The problem occurs between the system call to close the sock and hci_rx_work, where the former releases the sock and the latter accesses it without lock protection. CPU0 CPU1 ---- ---- sock_close hci_rx_work l2cap_sock_release hci_acldata_packet l2cap_sock_kill l2cap_recv_frame sk_free l2cap_conless_channel l2cap_sock_recv_cb If hci_rx_work processes the data that needs to be received before the sock is closed, then everything is normal; Otherwise, the work thread may access the released sock when receiving data. Add a chan mutex in the rx callback of the sock to achieve synchronization between the sock release and recv cb. Sock is dead, so set chan data to NULL, avoid others use invalid sock pointer.

Affected Products 9

References 5

• git.kernel.org https://git.kernel.org/stable/c/3b732449b78183d17178db40be3a4401cf3cd629
  Patch
• git.kernel.org https://git.kernel.org/stable/c/605572e64cd9cebb05ed609d96cff05b50d18cdf
  Patch
• git.kernel.org https://git.kernel.org/stable/c/89e856e124f9ae548572c56b1b70c2255705f8fe
  Patch
• git.kernel.org https://git.kernel.org/stable/c/b803f30ea23e0968b6c8285c42adf0d862ab2bf6
  Patch
• lists.debian.org https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html

Remediation

• git.kernel.org https://git.kernel.org/stable/c/3b732449b78183d17178db40be3a4401cf3cd629
  Patch
• git.kernel.org https://git.kernel.org/stable/c/605572e64cd9cebb05ed609d96cff05b50d18cdf
  Patch
• git.kernel.org https://git.kernel.org/stable/c/89e856e124f9ae548572c56b1b70c2255705f8fe
  Patch
• git.kernel.org https://git.kernel.org/stable/c/b803f30ea23e0968b6c8285c42adf0d862ab2bf6
  Patch