Improper Check for Unusual or Exceptional Conditions in Linux kernel - CVE-2026-80946
Published: September 13, 2026
Vulnerability identifier: #VU149444
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-2026-80946
CWE-ID: CWE-754
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-80946
Install security update from vendor's repository.