Out-of-bounds read in Linux kernel - CVE-2026-64081

Vulnerability identifier: #VU138562

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-2026-64081

CWE-ID: CWE-125

Exploitation vector: Local access

Exploit availability: No public exploit available

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

The vulnerability exists due to an out-of-bounds read in the arm ffa framework notification handler when processing malformed framework notification messages from the shared RX buffer. A local user can provide a crafted notification message to cause a denial of service.

The issue involves validation of the indirect message offset and size fields, including rejection of zero-length payloads and invalid non-header payload alignment.

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/3c51d99449dc5a01c08a7fce6071d6721f5aac83
• https://git.kernel.org/stable/c/4a1cc9e96b311d2609a6f963a5e35bd4ae730d97
• https://git.kernel.org/stable/c/76eb90e2b03de147e12ab68ea8afd8ea0342df0a

• Out-of-bounds read in Linux kernel firmware arm_ffa driver
• 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