FKIE_CVE-2026-74331

Vulnerability from fkie_nvd - Published: 2026-08-15 06:22 - Updated: 2026-08-17 06:19
Severity
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/38149b57427c736c08d9aa4c7b87deacd53e9e63
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/490b0385e4cfac691f7b18dde821c13e77b4770b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7865a1bfd20d10c03b083a5fc392d907ca5099b3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/806cb8fabfde7f830da5ae87777d52fdf50c4774
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a5b2a68a391b05d54552f13548a72a46c65006f7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c0f2dedd41fe14dbe076c1672214802fb42cd8c8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d3ec78f8f8d48a04a9fac38d47275c34645e5103
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f25d6e4ec4c257030592bd671f113cf9584c52f0
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/base/firmware_loader/main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "806cb8fabfde7f830da5ae87777d52fdf50c4774",
              "status": "affected",
              "version": "ac39b3ea73aacde876d1d5ee1ca3e2719f771482",
              "versionType": "git"
            },
            {
              "lessThan": "7865a1bfd20d10c03b083a5fc392d907ca5099b3",
              "status": "affected",
              "version": "ac39b3ea73aacde876d1d5ee1ca3e2719f771482",
              "versionType": "git"
            },
            {
              "lessThan": "490b0385e4cfac691f7b18dde821c13e77b4770b",
              "status": "affected",
              "version": "ac39b3ea73aacde876d1d5ee1ca3e2719f771482",
              "versionType": "git"
            },
            {
              "lessThan": "38149b57427c736c08d9aa4c7b87deacd53e9e63",
              "status": "affected",
              "version": "ac39b3ea73aacde876d1d5ee1ca3e2719f771482",
              "versionType": "git"
            },
            {
              "lessThan": "a5b2a68a391b05d54552f13548a72a46c65006f7",
              "status": "affected",
              "version": "ac39b3ea73aacde876d1d5ee1ca3e2719f771482",
              "versionType": "git"
            },
            {
              "lessThan": "f25d6e4ec4c257030592bd671f113cf9584c52f0",
              "status": "affected",
              "version": "ac39b3ea73aacde876d1d5ee1ca3e2719f771482",
              "versionType": "git"
            },
            {
              "lessThan": "c0f2dedd41fe14dbe076c1672214802fb42cd8c8",
              "status": "affected",
              "version": "ac39b3ea73aacde876d1d5ee1ca3e2719f771482",
              "versionType": "git"
            },
            {
              "lessThan": "d3ec78f8f8d48a04a9fac38d47275c34645e5103",
              "status": "affected",
              "version": "ac39b3ea73aacde876d1d5ee1ca3e2719f771482",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/base/firmware_loader/main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.7"
            },
            {
              "lessThan": "3.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "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."
    }
  ],
  "id": "CVE-2026-74331",
  "lastModified": "2026-08-17T06:19:27.560",
  "metrics": {},
  "published": "2026-08-15T06:22:33.907",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "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"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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