SB2026091310 - Improper Check for Unusual or Exceptional Conditions in Linux kernel fuse

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Check for Unusual or Exceptional Conditions (CVE-ID: CVE-2026-80946)

CWE-ID: CWE-754 - Improper Check for Unusual or 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 hardened usercopy restrictions in the FUSE io-uring transport when copying FUSE request headers between a request slab object and userspace. A local user can trigger request header copying to cause a denial of service.

Systems with CONFIG_HARDENED_USERCOPY enabled can panic when the invalid slab-object usercopy is detected.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/194d0fb0ea4720535ff3168c9d04c7632cec7071
• https://git.kernel.org/stable/c/a47a416ff68d706dc3327ab583f86b9ee757358b
• https://git.kernel.org/stable/c/fd10f40af314f07b6d6e028b1ca25c8b49903aab