SB20260720161 - Improper Check or Handling of Exceptional Conditions in Linux kernel netfs

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Check or Handling of Exceptional Conditions (CVE-ID: CVE-2026-64069)

CWE-ID: CWE-703 - Improper Check or Handling of Exceptional Conditions

CVSSv4: 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]

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.

Remediation

Install update from vendor's website.

References

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