PT-2026-39065 · Linux · Linux Kernel

Alistair Popple

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Published

2026-05-08

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Updated

2026-05-15

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CVE-2026-43404

CVSS v3.1

5.5

Medium

VectorAV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)
Description A livelock or starvation issue exists in the hmm range fault() function. When hmm range fault() fails a folio trylock() call within do swap page() while attempting to acquire the lock of a device-private folio for migration to RAM, the function spins until the lock is acquired. If the process holding the lock depends on a work item scheduled on the same CPU as the spinning hmm range fault(), the work item may be starved, leading to a permanent livelock. This scenario can occur if the lock-holding process is stuck in migrate device unmap() calling lru add drain all(), as the latter requires a short work item to run on all online CPUs to complete.
Recommendations Wait for the folio to be unlocked if folio trylock() fails in do swap page().

Fix

Improper Locking

Weakness Enumeration

CWE-667

Related Identifiers

CVE-2026-43404

Affected Products

Linux Kernel