Out-of-bounds read in Linux kernel - CVE-2026-64124

Vulnerability identifier: #VU138506

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-2026-64124

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 net_devmem_bind_dmabuf() and related devmem indexing logic when processing a dma-buf bind request with a non-page-aligned size or scatter-gather length. A local user can provide a crafted dma-buf to trigger out-of-bounds access and cause a denial of service.

The non-page-aligned size condition affects TX handling, while the scatter-gather length condition affects both RX and TX.

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/134c517dfa63203287b2aad6558017f42435a02e
• https://git.kernel.org/stable/c/4eb82ba543421e9e38cc14e4e82058b78850df50
• https://git.kernel.org/stable/c/d5008e4e4ee6b739256b796702a7d1aae1b5c3b4

• Out-of-bounds read in Linux kernel core
• 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