Improper Initialization in Linux kernel - CVE-2026-74402

Vulnerability identifier: #VU142719

CSH Severity: Low

CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-74402

CWE-ID: CWE-665

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to obtain insufficiently random entropy.

The vulnerability exists due to improper buffer management in the atmel-sha204a hardware random number generator driver when reading random data from the device response buffer. A local user can read from /dev/hwrng to obtain insufficiently random entropy.

The issue affects both the blocking and non-blocking rng paths.

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/2fa302bbc62dec7cb6339c9494e0e3f2f884afeb
• https://git.kernel.org/stable/c/319400fc5ee15db5793aa45f854968141326effc
• https://git.kernel.org/stable/c/76269a91fd9560c5f03c3e59421a0329e39a6661
• https://git.kernel.org/stable/c/9039bb4f238474379221fc933c34f19f0cba501b
• https://git.kernel.org/stable/c/938ae1fb4a8f5db43b62b6206d409efbf317f0d9
• https://git.kernel.org/stable/c/aac63bbea8fd5a34f1a4305cb73369068f952d32
• https://git.kernel.org/stable/c/d4aa6141ff03ec82eed6fcef814300fb855ce5d8
• https://git.kernel.org/stable/c/e833e865e4944ba75120db534bd931db6cf677d3

• Improper Initialization in Linux kernel crypto 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