CVE-2024-54191

/// Technical description

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

Bluetooth: iso: Fix circular lock in iso_conn_big_sync

This fixes the circular locking dependency warning below, by reworking

iso_sock_recvmsg, to ensure that the socket lock is always released

before calling a function that locks hdev.

[ 561.670344] ======================================================

[ 561.670346] WARNING: possible circular locking dependency detected

[ 561.670349] 6.12.0-rc6+ #26 Not tainted

[ 561.670351] ------------------------------------------------------

[ 561.670353] iso-tester/3289 is trying to acquire lock:

[ 561.670355] ffff88811f600078 (&hdev->lock){+.+.}-{3:3},

at: iso_conn_big_sync+0x73/0x260 [bluetooth]

[ 561.670405]

but task is already holding lock:

[ 561.670407] ffff88815af58258 (sk_lock-AF_BLUETOOTH){+.+.}-{0:0},

at: iso_sock_recvmsg+0xbf/0x500 [bluetooth]

[ 561.670450]

which lock already depends on the new loc

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References