Improper Check or Handling of Exceptional Conditions in Linux kernel - CVE-2026-64148

Vulnerability identifier: #VU138488

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-2026-64148

CWE-ID: CWE-703

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 improper error handling in pdsc_devcmd_wait() when handling firmware crash or command timeout conditions. A local user can trigger the vulnerable code path to cause a denial of service.

The issue causes stale success status to be returned instead of propagating an error, which can prevent proper recovery handling.

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/0e46b6635b03d29807f810c3b415c4755a3f958d
• https://git.kernel.org/stable/c/10ae3180095bbe2d378c5b1d6f2f2fd74dda3cc2
• https://git.kernel.org/stable/c/3231aff8ab26111c54e630b1a200fc43a729dd14
• https://git.kernel.org/stable/c/560d559324169fe0583d54c475b5329550a86f71
• https://git.kernel.org/stable/c/784dd2bdc622ed3cc6ef8e113aa1852e252de36f

• Improper Check or Handling of Exceptional Conditions in Linux kernel amd pds_core 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