Improper locking in Linux kernel - CVE-2026-43404
Published: May 8, 2026
Vulnerability identifier: #VU130787
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-43404
CWE-ID: CWE-667
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 lock handling in hmm_range_fault() and do_swap_page() when handling device-private folio migration to system memory. A local user can trigger page fault handling that spins on a folio lock to cause a denial of service.
Exploitation requires a specific memory migration scenario involving device-private folios, deferred migration PTE insertion, and no or voluntary-only preemption.
Affected software
Linux kernel
How to mitigate CVE-2026-43404
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3