Improper validation of integrity check value in Linux kernel - CVE-2026-31719

Vulnerability identifier: #VU128976

CSH Severity: Low

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

CVE-ID: CVE-2026-31719

CWE-ID: CWE-354

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to bypass integrity verification.

The vulnerability exists due to improper integrity check handling in krb5enc_dispatch_decrypt() when processing asynchronous decrypt operations. A local user can trigger asynchronous decryption completion to bypass integrity verification.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-azure (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-raspi (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - update to 7.0.0-27.27
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1010.10
linux-nvidia (Ubuntu package) - update to 7.0.0-1013.13
linux-raspi (Ubuntu package) - update to 7.0.0-1014.14

• https://git.kernel.org/stable/c/07cbb1bd424370671814a862913c99a6e1441588
• https://git.kernel.org/stable/c/3bfbf5f0a99c991769ec562721285df7ab69240b
• https://git.kernel.org/stable/c/e51f42114abbdf47f29dda43e7826be28907fcd2

• Improper validation of integrity check value in Linux kernel crypto
• Ubuntu update for linux
• Ubuntu update for linux-raspi
• Ubuntu update for linux-nvidia
• Ubuntu update for linux-azure