firmware_loader: Fix recursive lock in device_cache_fw_images()
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.
- Published
- Aug 15, 2026
- Updated
- Aug 17, 2026
- EPSS
- 0.2% · 13th percentile
- CWE
- —
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Report tools
Action score
0
Monitor
Low priority for now.
- CVSS
- 0 / 40 · —
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.2%
Affected systems
—
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.
Linux Linux
- 3.7affected
- ac39b3ea73aacde876d1d5ee1ca3e2719f771482 and later · before 806cb8fabfde7f830da5ae87777d52fdf50c4774affected · git
- ac39b3ea73aacde876d1d5ee1ca3e2719f771482 and later · before 7865a1bfd20d10c03b083a5fc392d907ca5099b3affected · git
- ac39b3ea73aacde876d1d5ee1ca3e2719f771482 and later · before 490b0385e4cfac691f7b18dde821c13e77b4770baffected · git
- ac39b3ea73aacde876d1d5ee1ca3e2719f771482 and later · before 38149b57427c736c08d9aa4c7b87deacd53e9e63affected · git
- ac39b3ea73aacde876d1d5ee1ca3e2719f771482 and later · before a5b2a68a391b05d54552f13548a72a46c65006f7affected · git
- ac39b3ea73aacde876d1d5ee1ca3e2719f771482 and later · before f25d6e4ec4c257030592bd671f113cf9584c52f0affected · git
- ac39b3ea73aacde876d1d5ee1ca3e2719f771482 and later · before c0f2dedd41fe14dbe076c1672214802fb42cd8c8affected · git
- ac39b3ea73aacde876d1d5ee1ca3e2719f771482 and later · before d3ec78f8f8d48a04a9fac38d47275c34645e5103affected · git
- before 3.7not affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | before 6.1.180-1 | 6.1.180-1 |
| Debian:13 | linux | before 6.12.100-1 | 6.12.100-1 |
| Debian:14 | linux | before 7.1.5-1 | 7.1.5-1 |
Same product
linux: all recordsOther highest-scoring records for the same primary product.
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Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 38149b57427c736c08d9aa4c7b87deacd53e9e63 | Vendor (CNA) |
| Linux Linux | 490b0385e4cfac691f7b18dde821c13e77b4770b | Vendor (CNA) |
| Linux Linux | 7865a1bfd20d10c03b083a5fc392d907ca5099b3 | Vendor (CNA) |
| Linux Linux | 806cb8fabfde7f830da5ae87777d52fdf50c4774 | Vendor (CNA) |
| Linux Linux | a5b2a68a391b05d54552f13548a72a46c65006f7 | Vendor (CNA) |
| Linux Linux | c0f2dedd41fe14dbe076c1672214802fb42cd8c8 | Vendor (CNA) |
| Linux Linux | d3ec78f8f8d48a04a9fac38d47275c34645e5103 | Vendor (CNA) |
| Linux Linux | f25d6e4ec4c257030592bd671f113cf9584c52f0 | Vendor (CNA) |
| debian:linux | 6.1.180-1 · Debian:12 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
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Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
No CVSS vector for this record, so attack conditions can't be derived.
Weakness class (CWE)
—
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- git.kernel.org/stable/c/38149b57427c736c08d9aa4c7b87deacd53e9e63
- git.kernel.org/stable/c/490b0385e4cfac691f7b18dde821c13e77b4770b
- git.kernel.org/stable/c/7865a1bfd20d10c03b083a5fc392d907ca5099b3
- git.kernel.org/stable/c/806cb8fabfde7f830da5ae87777d52fdf50c4774
- git.kernel.org/stable/c/a5b2a68a391b05d54552f13548a72a46c65006f7
- git.kernel.org/stable/c/c0f2dedd41fe14dbe076c1672214802fb42cd8c8
- git.kernel.org/stable/c/d3ec78f8f8d48a04a9fac38d47275c34645e5103
- git.kernel.org/stable/c/f25d6e4ec4c257030592bd671f113cf9584c52f0
Vendor advisories and official records. Exploit/PoC links are deliberately left out.