firmware_loader: Fix recursive lock in device_cache_fw_images()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74331
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:33 UTC
Updated2026-08-17 06:19:27 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.001900000 probability, percentile 0.089730000 (date 2026-08-17)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ac39b3ea73aacde876d1d5ee1ca3e2719f771482 806cb8fabfde7f830da5ae87777d52fdf50c4774 git Not specified
CNA Linux Linux affected ac39b3ea73aacde876d1d5ee1ca3e2719f771482 7865a1bfd20d10c03b083a5fc392d907ca5099b3 git Not specified
CNA Linux Linux affected ac39b3ea73aacde876d1d5ee1ca3e2719f771482 490b0385e4cfac691f7b18dde821c13e77b4770b git Not specified
CNA Linux Linux affected ac39b3ea73aacde876d1d5ee1ca3e2719f771482 38149b57427c736c08d9aa4c7b87deacd53e9e63 git Not specified
CNA Linux Linux affected ac39b3ea73aacde876d1d5ee1ca3e2719f771482 a5b2a68a391b05d54552f13548a72a46c65006f7 git Not specified
CNA Linux Linux affected ac39b3ea73aacde876d1d5ee1ca3e2719f771482 f25d6e4ec4c257030592bd671f113cf9584c52f0 git Not specified
CNA Linux Linux affected ac39b3ea73aacde876d1d5ee1ca3e2719f771482 c0f2dedd41fe14dbe076c1672214802fb42cd8c8 git Not specified
CNA Linux Linux affected ac39b3ea73aacde876d1d5ee1ca3e2719f771482 d3ec78f8f8d48a04a9fac38d47275c34645e5103 git Not specified
CNA Linux Linux affected 3.7 Not specified
CNA Linux Linux unaffected 3.7 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/c0f2dedd41fe14dbe076c1672214802fb42cd8c8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d3ec78f8f8d48a04a9fac38d47275c34645e5103 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a5b2a68a391b05d54552f13548a72a46c65006f7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f25d6e4ec4c257030592bd671f113cf9584c52f0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7865a1bfd20d10c03b083a5fc392d907ca5099b3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/38149b57427c736c08d9aa4c7b87deacd53e9e63 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/806cb8fabfde7f830da5ae87777d52fdf50c4774 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/490b0385e4cfac691f7b18dde821c13e77b4770b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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