Improper Check or Handling of Exceptional Conditions in Linux kernel - CVE-2026-64069

Vulnerability identifier: #VU138569

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-2026-64069

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 handling of failed read subrequest cancellation in fs/netfs read handling when preparing DIO or single-read subrequests. A local user can trigger read operations that cause subrequest preparation to fail to cause a denial of service.

The issue affects cancellation paths for both direct I/O reads and single-read dispatch.

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/5366199be46fb53de62861721d34ba816e7e440e
• https://git.kernel.org/stable/c/6f0f7ac1915abc0d202f0eb4b003a6548a5ba60d
• https://git.kernel.org/stable/c/f73372a4c6900d117f8e903fe10b62692f95e6c4

• Improper Check or Handling of Exceptional Conditions in Linux kernel netfs
• 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