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CVE-2026-74331 (GCVE-0-2026-74331)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:58 – Updated: 2026-08-17 05:17
VLAI
Title
firmware_loader: Fix recursive lock in device_cache_fw_images()
Summary
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ac39b3ea73aacde876d1d5ee1ca3e2719f771482 , < 806cb8fabfde7f830da5ae87777d52fdf50c4774 (git)
Affected: ac39b3ea73aacde876d1d5ee1ca3e2719f771482 , < 7865a1bfd20d10c03b083a5fc392d907ca5099b3 (git)
Affected: ac39b3ea73aacde876d1d5ee1ca3e2719f771482 , < 490b0385e4cfac691f7b18dde821c13e77b4770b (git)
Affected: ac39b3ea73aacde876d1d5ee1ca3e2719f771482 , < 38149b57427c736c08d9aa4c7b87deacd53e9e63 (git)
Affected: ac39b3ea73aacde876d1d5ee1ca3e2719f771482 , < a5b2a68a391b05d54552f13548a72a46c65006f7 (git)
Affected: ac39b3ea73aacde876d1d5ee1ca3e2719f771482 , < f25d6e4ec4c257030592bd671f113cf9584c52f0 (git)
Affected: ac39b3ea73aacde876d1d5ee1ca3e2719f771482 , < c0f2dedd41fe14dbe076c1672214802fb42cd8c8 (git)
Affected: ac39b3ea73aacde876d1d5ee1ca3e2719f771482 , < d3ec78f8f8d48a04a9fac38d47275c34645e5103 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.7
Unaffected: 0 , < 3.7 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "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\u0027s 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."
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        "shortName": "Linux"
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    "dateUpdated": "2026-08-17T05:17:22.413Z",
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"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\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/38149b57427c736c08d9aa4c7b87deacd53e9e63\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/490b0385e4cfac691f7b18dde821c13e77b4770b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7865a1bfd20d10c03b083a5fc392d907ca5099b3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/806cb8fabfde7f830da5ae87777d52fdf50c4774\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a5b2a68a391b05d54552f13548a72a46c65006f7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c0f2dedd41fe14dbe076c1672214802fb42cd8c8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d3ec78f8f8d48a04a9fac38d47275c34645e5103\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f25d6e4ec4c257030592bd671f113cf9584c52f0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-20T18:20:38+00:00",
      "cve": "CVE-2026-74331",
      "id": "CVE-2026-74331",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: firmware_loader: Fix recursive lock in device_cache_fw_images()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74331.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.