NULL pointer dereference in Linux kernel - CVE-2026-64134

Vulnerability identifier: #VU138497

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-2026-64134

CWE-ID: CWE-476

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 a NULL pointer dereference in the ALSA PCM interleaved_copy() function when handling silencing operations with NULL data. A local user can trigger a crafted PCM data transfer path to cause a denial of service.

The issue is architecture-dependent and was reported to cause failures on RISC-V systems.

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/41a766c647294842c9b17672449f8e011048cba9
• https://git.kernel.org/stable/c/c9f6768515818d71bdfc20119a81f3332c53b9c6
• https://git.kernel.org/stable/c/ce836587e594af39ff048d9b29dee0f5f10692c9
• https://git.kernel.org/stable/c/e4d3386b74fba8e01280484b67ee481ece00201e
• https://git.kernel.org/stable/c/feff0251386aa6bb180a0a1cf7c1f91ba868113d

• NULL pointer dereference 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