Improper Check for Unusual or Exceptional Conditions in Linux kernel - CVE-2026-43486
Published: May 14, 2026
Vulnerability identifier: #VU131433
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-2026-43486
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 access flag handling in contpte_ptep_set_access_flags() when handling SMMU or ATS faults on individual sub-PTEs within a CONT range. A local user can trigger memory access faults to cause a denial of service.
The issue can result in an infinite fault loop on systems where page-table walkers evaluate each descriptor individually.
Affected software
Linux kernel
How to mitigate CVE-2026-43486
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3