CVE-2026-43389
kernel: mm: memfd_luo: always dirty all folios
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Severity
ModerateRed Hat Product Security
CVSS
Review impact separately from score.
Published · May 8, 2026
Updated · June 28, 2026
Description
A flaw was found in the memfd_luo subsystem of the Linux kernel. When using memfd preservation with Live Update Operations (LUO), the kernel may incorrectly mark a memory page (folio) as clean even if it contains user data. This can lead to data loss, as the kernel might reclaim these 'dirty' folios under memory pressure, resulting in the loss of user data.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CWE-821 · Incorrect Synchronization