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

firmware_loader: Fix recursive lock in device_cache_fw_images()

A recursive locking deadlock can occur in the firmware loader's power
management notification handler.

During system suspend or hibernation preparation, fw_pm_notify() calls
device_cache_fw_images(). This function acquires fw_lock to set the
firmware cache state to FW_LOADER_START_CACHE and then iterates over all
devices using dpm_for_each_dev() while still holding the lock.

For each device, dev_cache_fw_image() schedules asynchronous work to cache
the firmware. If memory allocation for the async work entry fails (e.g., in
out-of-memory conditions), async_schedule_node_domain() falls back to
executing the work function synchronously in the current thread.

The synchronous execution path (__async_dev_cache_fw_image() ->
cache_firmware() -> request_firmware() -> assign_fw()) attempts to acquire
fw_lock again. Since the current thread already holds fw_lock, this results
in a recursive locking deadlock.

Fix this by releasing fw_lock immediately after updating the cache state
and before calling dpm_for_each_dev(). The lock is only needed to protect
the state update. Concurrent firmware requests will correctly see the
FW_LOADER_START_CACHE state and use the piggyback mechanism, which is
independently protected by its own fwc->name_lock.

https://git.kernel.org/stable/c/38149b57427c736c08d9aa4c7b87deacd53e9e63

https://git.kernel.org/stable/c/490b0385e4cfac691f7b18dde821c13e77b4770b

https://git.kernel.org/stable/c/7865a1bfd20d10c03b083a5fc392d907ca5099b3

https://git.kernel.org/stable/c/806cb8fabfde7f830da5ae87777d52fdf50c4774

https://git.kernel.org/stable/c/a5b2a68a391b05d54552f13548a72a46c65006f7

https://git.kernel.org/stable/c/c0f2dedd41fe14dbe076c1672214802fb42cd8c8

https://git.kernel.org/stable/c/d3ec78f8f8d48a04a9fac38d47275c34645e5103

https://git.kernel.org/stable/c/f25d6e4ec4c257030592bd671f113cf9584c52f0

[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","programFiles":["drivers/base/firmware_loader/main.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"ac39b3ea73aacde876d1d5ee1ca3e2719f771482","lessThan":"806cb8fabfde7f830da5ae87777d52fdf50c4774","versionType":"git","status":"affected"},{"version":"ac39b3ea73aacde876d1d5ee1ca3e2719f771482","lessThan":"7865a1bfd20d10c03b083a5fc392d907ca5099b3","versionType":"git","status":"affected"},{"version":"ac39b3ea73aacde876d1d5ee1ca3e2719f771482","lessThan":"490b0385e4cfac691f7b18dde821c13e77b4770b","versionType":"git","status":"affected"},{"version":"ac39b3ea73aacde876d1d5ee1ca3e2719f771482","lessThan":"38149b57427c736c08d9aa4c7b87deacd53e9e63","versionType":"git","status":"affected"},{"version":"ac39b3ea73aacde876d1d5ee1ca3e2719f771482","lessThan":"a5b2a68a391b05d54552f13548a72a46c65006f7","versionType":"git","status":"affected"},{"version":"ac39b3ea73aacde876d1d5ee1ca3e2719f771482","lessThan":"f25d6e4ec4c257030592bd671f113cf9584c52f0","versionType":"git","status":"affected"},{"version":"ac39b3ea73aacde876d1d5ee1ca3e2719f771482","lessThan":"c0f2dedd41fe14dbe076c1672214802fb42cd8c8","versionType":"git","status":"affected"},{"version":"ac39b3ea73aacde876d1d5ee1ca3e2719f771482","lessThan":"d3ec78f8f8d48a04a9fac38d47275c34645e5103","versionType":"git","status":"affected"}]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","programFiles":["drivers/base/firmware_loader/main.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"3.7","status":"affected"},{"version":"0","lessThan":"3.7","versionType":"semver","status":"unaffected"},{"version":"5.10.261","lessThanOrEqual":"5.10.*","versionType":"semver","status":"unaffected"},{"version":"5.15.212","lessThanOrEqual":"5.15.*","versionType":"semver","status":"unaffected"},{"version":"6.1.178","lessThanOrEqual":"6.1.*","versionType":"semver","status":"unaffected"},{"version":"6.6.145","lessThanOrEqual":"6.6.*","versionType":"semver","status":"unaffected"},{"version":"6.12.97","lessThanOrEqual":"6.12.*","versionType":"semver","status":"unaffected"},{"version":"6.18.40","lessThanOrEqual":"6.18.*","versionType":"semver","status":"unaffected"},{"version":"7.1.5","lessThanOrEqual":"7.1.*","versionType":"semver","status":"unaffected"},{"version":"7.2-rc1","lessThanOrEqual":"*","versionType":"original_commit_for_fix","status":"unaffected"}]}]