Deadlock in Linux kernel - CVE-2026-74331

Vulnerability identifier: #VU142868

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-74331

CWE-ID: CWE-833

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local attacker to cause a denial of service.

The vulnerability exists due to a recursive locking deadlock in firmware_loader power management notification handling when preparing for system suspend or hibernation and caching firmware images. A local attacker can trigger an out-of-memory condition that causes synchronous execution of firmware caching work to cause a denial of service.

The issue occurs when asynchronous work scheduling falls back to synchronous execution after memory allocation for the work entry fails.

Linux kernel
Ubuntu
linux-nvidia (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux-azure-7.0 (Ubuntu package)
linux-azure (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux-nvidia (Ubuntu package) - addressed in versions 5.15.0-1112.113, 5.15.0.1112.112
linux-gcp-7.0 (Ubuntu package) - addressed in versions 7.0.0-38.38~24.04.4, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14~24.04.1
linux (Ubuntu package) - addressed in versions 7.0.0-38.38, 7.0.0-38.38.1, 7.0.0-1008.9, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14, 7.0.0-1015.15
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1015.15
linux-azure-7.0 (Ubuntu package) - addressed in versions 7.0.0-1016.16~24.04.1, 7.0.0-1017.17~24.04.1
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1016.16, 7.0.0-1017.17

• https://git.kernel.org/stable/c/38149b57427c736c08d9aa4c7b87deacd53e9e63
• https://git.kernel.org/stable/c/490b0385e4cfac691f7b18dde821c13e77b4770b
• https://git.kernel.org/stable/c/7865a1bfd20d10c03b083a5fc392d907ca5099b3
• https://git.kernel.org/stable/c/806cb8fabfde7f830da5ae87777d52fdf50c4774
• https://git.kernel.org/stable/c/a5b2a68a391b05d54552f13548a72a46c65006f7
• https://git.kernel.org/stable/c/c0f2dedd41fe14dbe076c1672214802fb42cd8c8
• https://git.kernel.org/stable/c/d3ec78f8f8d48a04a9fac38d47275c34645e5103
• https://git.kernel.org/stable/c/f25d6e4ec4c257030592bd671f113cf9584c52f0

• Deadlock in Linux kernel base firmware_loader driver
• Ubuntu update for linux-gcp-7.0
• Ubuntu update for linux-nvidia
• Ubuntu update for linux-azure-7.0
• Ubuntu update for linux
• Ubuntu update for linux-azure
• Ubuntu update for linux-oem-7.0