Memory corruption in Linux kernel - CVE-2026-64026

Vulnerability identifier: #VU138622

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:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-64026

CWE-ID: CWE-119

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause pagecache corruption.

The vulnerability exists due to memory corruption in the Linux kernel RxRPC recvmsg handling when decrypting locally transmitted DATA packets processed through splice(). A local user can trigger crafted local packet handling to cause pagecache corruption.

The issue affects in-place decryption of shared packet data, and MSG_PEEK may influence which packet is decrypted and require re-decryption during subsequent recvmsg() processing.

Linux kernel
Ubuntu
linux-ibm (Ubuntu package)
linux-azure (Ubuntu package)
linux-aws (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-nvidia-bos (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux-ibm (Ubuntu package) - addressed in versions 7.0.0-1008.8, 7.0.0-1010.10
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1010.10
linux-aws (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1015.15
linux-nvidia (Ubuntu package) - addressed in versions 7.0.0-1016.16, 7.0.0-1016.16~24.04.1
linux-nvidia-bos (Ubuntu package) - update to 7.0.0-2016.16

• https://git.kernel.org/stable/c/46cb765e2e5ad52303ea157e10d370bb6b7acbbf
• https://git.kernel.org/stable/c/a05bf6d9e621fa71e89ccebe3047ba45218d7b38
• https://git.kernel.org/stable/c/b94a6ccbaf1104dd980150a65fdeb2f69d17d2f5
• https://git.kernel.org/stable/c/c580087743712112778a06d65a4074053072d7bf
• https://git.kernel.org/stable/c/d2bc90cf6c75cb96d2ce549be6c35efa3099d25b

• Memory corruption in Linux kernel rxrpc
• Ubuntu update for linux-ibm
• Ubuntu update for linux-azure
• Ubuntu update for linux-aws
• Ubuntu update for linux-nvidia-bos
• Ubuntu update for linux-nvidia