Improper locking in Linux kernel - CVE-2026-43404
Published: May 8, 2026
Vulnerability identifier: #VU130787
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-43404
CWE-ID: CWE-667
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
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.
How to mitigate CVE-2026-43404
Install security update from vendor's repository.