Improper input validation in Linux kernel - CVE-2026-46085

Vulnerability identifier: #VU132413

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-46085

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: No public exploit available

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

The vulnerability exists due to improper input validation in the rxkad crypto handling in rxrpc when processing a packet with a misaligned crypto length. A remote attacker can send a specially crafted packet to cause a denial of service.

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/440d20d95e844b657a93a0b2dcc2aae155efdce6
• https://git.kernel.org/stable/c/af9271eb666d07b6f65612dc160a47f7cb5220ed
• https://git.kernel.org/stable/c/def304aae2edf321d2671fd6ca766a93c21f877e
• https://git.kernel.org/stable/c/f0d3efd03b2a9e0f1ffa6df8fcb264af3d494286
• https://git.kernel.org/stable/c/f1c6bd0cc786a8fa74829ce3c4b3673944a308f4

• Improper input validation in Linux kernel rxrpc
• Ubuntu update for linux
• Ubuntu update for linux-raspi
• Ubuntu update for linux-nvidia
• Ubuntu update for linux-azure