{"id":"CVE-2026-74331","summary":"firmware_loader: Fix recursive lock in device_cache_fw_images()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nfirmware_loader: Fix recursive lock in device_cache_fw_images()\n\nA recursive locking deadlock can occur in the firmware loader's power\nmanagement notification handler.\n\nDuring system suspend or hibernation preparation, fw_pm_notify() calls\ndevice_cache_fw_images(). This function acquires fw_lock to set the\nfirmware cache state to FW_LOADER_START_CACHE and then iterates over all\ndevices using dpm_for_each_dev() while still holding the lock.\n\nFor each device, dev_cache_fw_image() schedules asynchronous work to cache\nthe firmware. If memory allocation for the async work entry fails (e.g., in\nout-of-memory conditions), async_schedule_node_domain() falls back to\nexecuting the work function synchronously in the current thread.\n\nThe synchronous execution path (__async_dev_cache_fw_image() -\u003e\ncache_firmware() -\u003e request_firmware() -\u003e assign_fw()) attempts to acquire\nfw_lock again. Since the current thread already holds fw_lock, this results\nin a recursive locking deadlock.\n\nFix this by releasing fw_lock immediately after updating the cache state\nand before calling dpm_for_each_dev(). The lock is only needed to protect\nthe state update. Concurrent firmware requests will correctly see the\nFW_LOADER_START_CACHE state and use the piggyback mechanism, which is\nindependently protected by its own fwc-\u003ename_lock.","modified":"2026-08-16T03:48:34.957606924Z","published":"2026-08-15T05:58:24.420Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74331.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/38149b57427c736c08d9aa4c7b87deacd53e9e63"},{"type":"WEB","url":"https://git.kernel.org/stable/c/490b0385e4cfac691f7b18dde821c13e77b4770b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7865a1bfd20d10c03b083a5fc392d907ca5099b3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/806cb8fabfde7f830da5ae87777d52fdf50c4774"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a5b2a68a391b05d54552f13548a72a46c65006f7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c0f2dedd41fe14dbe076c1672214802fb42cd8c8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d3ec78f8f8d48a04a9fac38d47275c34645e5103"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f25d6e4ec4c257030592bd671f113cf9584c52f0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74331.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74331"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"ac39b3ea73aacde876d1d5ee1ca3e2719f771482"},{"fixed":"806cb8fabfde7f830da5ae87777d52fdf50c4774"},{"fixed":"7865a1bfd20d10c03b083a5fc392d907ca5099b3"},{"fixed":"490b0385e4cfac691f7b18dde821c13e77b4770b"},{"fixed":"38149b57427c736c08d9aa4c7b87deacd53e9e63"},{"fixed":"a5b2a68a391b05d54552f13548a72a46c65006f7"},{"fixed":"f25d6e4ec4c257030592bd671f113cf9584c52f0"},{"fixed":"c0f2dedd41fe14dbe076c1672214802fb42cd8c8"},{"fixed":"d3ec78f8f8d48a04a9fac38d47275c34645e5103"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74331.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.7.0"},{"fixed":"5.10.261"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.212"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.178"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.145"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.97"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.40"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74331.json"}}],"schema_version":"1.9.0"}