CVE-2026-74331Public exploit

System hang via recursive firmware-cache lock

Published Aug 15, 2026 · Updated Aug 15, 2026

Deadlock in the Linux kernel firmware loader allows local users to hang the system during suspend or hibernation under memory pressure. device_cache_fw_images() holds fw_lock while synchronous fallback caching reaches assign_fw(), which tries to acquire the same lock again. Triggering requires power-state preparation plus asynchronous-work allocation failure, leaving the power-management path hung.

CVSS severity5.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deadlock in the Linux kernel firmware loader allows local users to hang the system during suspend or hibernation under memory pressure. device_cache_fw_images() holds fw_lock while synchronous fallback caching reaches assign_fw(), which tries to acquire the same lock again. Triggering requires power-state preparation plus asynchronous-work allocation failure, leaving the power-management path hung.

The record

CVE
CVE-2026-74331
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-833, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.7
  2. Affected versionversion=ac39b3ea73aacde876d1d5ee1ca3e2719f771482 <38149b57427c736c08d9aa4c7b87deacd53e9e63
  3. Affected versionversion=ac39b3ea73aacde876d1d5ee1ca3e2719f771482 <490b0385e4cfac691f7b18dde821c13e77b4770b
  4. Affected versionversion=ac39b3ea73aacde876d1d5ee1ca3e2719f771482 <7865a1bfd20d10c03b083a5fc392d907ca5099b3
  5. Affected versionversion=ac39b3ea73aacde876d1d5ee1ca3e2719f771482 <806cb8fabfde7f830da5ae87777d52fdf50c4774
  6. Affected versionversion=ac39b3ea73aacde876d1d5ee1ca3e2719f771482 <a5b2a68a391b05d54552f13548a72a46c65006f7
  7. Affected versionversion=ac39b3ea73aacde876d1d5ee1ca3e2719f771482 <c0f2dedd41fe14dbe076c1672214802fb42cd8c8
  8. Affected versionversion=ac39b3ea73aacde876d1d5ee1ca3e2719f771482 <d3ec78f8f8d48a04a9fac38d47275c34645e5103
  9. Affected versionversion=ac39b3ea73aacde876d1d5ee1ca3e2719f771482 <f25d6e4ec4c257030592bd671f113cf9584c52f0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.7; version=ac39b3ea73aacde876d1d5ee1ca3e2719f771482 <38149b57427c736c08d9aa4c7b87deacd53e9e63; version=ac39b3ea73aacde876d1d5ee1ca3e2719f771482 <490b0385e4cfac691f7b18dde821c13e77b4770b; version=ac39b3ea73aacde876d1d5ee1ca3e2719f771482 <7865a1bfd20d10c03b083a5fc392d907ca5099b3; version=ac39b3ea73aacde876d1d5ee1ca3e2719f771482 <806cb8fabfde7f830da5ae87777d52fdf50c4774; version=ac39b3ea73aacde876d1d5ee1ca3e2719f771482 <a5b2a68a391b05d54552f13548a72a46c65006f7; version=ac39b3ea73aacde876d1d5ee1ca3e2719f771482 <c0f2dedd41fe14dbe076c1672214802fb42cd8c8; version=ac39b3ea73aacde876d1d5ee1ca3e2719f771482 <d3ec78f8f8d48a04a9fac38d47275c34645e5103; version=ac39b3ea73aacde876d1d5ee1ca3e2719f771482 <f25d6e4ec4c257030592bd671f113cf9584c52f0

Published CVSS scores

4.7Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-833Deadlock
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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