Unknown

CVE-2026-74331 — 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 Oct 15, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+2

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.24%

ahead of 15% of scored CVEs · Oct 29, 2026

Affects

Linux

CVSS base

—

Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	≥ ac39b3ea73aacde876d1d5ee1ca3e2719f771482 and < 806cb8fabfde7f830da5ae87777d52fdf50c4774≥ ac39b3ea73aacde876d1d5ee1ca3e2719f771482 and < 7865a1bfd20d10c03b083a5fc392d907ca5099b3≥ ac39b3ea73aacde876d1d5ee1ca3e2719f771482 and < 490b0385e4cfac691f7b18dde821c13e77b4770b≥ ac39b3ea73aacde876d1d5ee1ca3e2719f771482 and < 38149b57427c736c08d9aa4c7b87deacd53e9e63≥ ac39b3ea73aacde876d1d5ee1ca3e2719f771482 and < a5b2a68a391b05d54552f13548a72a46c65006f7≥ ac39b3ea73aacde876d1d5ee1ca3e2719f771482 and < f25d6e4ec4c257030592bd671f113cf9584c52f0≥ ac39b3ea73aacde876d1d5ee1ca3e2719f771482 and < c0f2dedd41fe14dbe076c1672214802fb42cd8c8≥ ac39b3ea73aacde876d1d5ee1ca3e2719f771482 and < d3ec78f8f8d48a04a9fac38d47275c34645e5103 and 1 more version 3.7	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 15, 2026 → Oct 29, 2026 · 14 reading(s) · max 0.24%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 15, 2026
Affected products added · linux/linux
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Aug 15, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

8 on the record

git.kernel.org/stable/c/38149b57427c736c08d9aa4c7b87deacd53e9e63
NIST National Vulnerability Database
git.kernel.org/stable/c/c0f2dedd41fe14dbe076c1672214802fb42cd8c8
NIST National Vulnerability Database
git.kernel.org/stable/c/d3ec78f8f8d48a04a9fac38d47275c34645e5103
NIST National Vulnerability Database
git.kernel.org/stable/c/490b0385e4cfac691f7b18dde821c13e77b4770b
NIST National Vulnerability Database
git.kernel.org/stable/c/f25d6e4ec4c257030592bd671f113cf9584c52f0
NIST National Vulnerability Database
git.kernel.org/stable/c/7865a1bfd20d10c03b083a5fc392d907ca5099b3
NIST National Vulnerability Database
git.kernel.org/stable/c/a5b2a68a391b05d54552f13548a72a46c65006f7
NIST National Vulnerability Database
git.kernel.org/stable/c/806cb8fabfde7f830da5ae87777d52fdf50c4774
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Unknown CVE-2026-99216 Drivers: hv: Don't reset VMBus connection state on error/exit paths 2d
Unknown CVE-2026-99215 power: supply: core: prevent unregistering a power supply while a callback runs 2d
Unknown CVE-2026-99207 scsi: target: Disable interrupts while holding delayed_cmd_lock 2d
Unknown CVE-2026-99208 drm/xe/oa: Zero OA buffer at allocation 2d
Unknown CVE-2026-99209 drm/xe: skip eviction of a BO with no resource 2d
Unknown CVE-2026-99210 accel/rocket: clear rdev on device init failure 2d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CVSS score published by NVD, the CNA, CISA or GitHub so far.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-74331 is "firmware_loader: Fix recursive lock in device_cache_fw_images()", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.24% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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