CVE-2026-80729
Received Received - Intake

Memory Corruption in Linux Kernel via Folio Split

Publication date: 2026-09-03

Last updated on: 2026-09-03

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: mm/huge_memory: initialise workingset state before folio split xas_try_split() adds __GFP_ACCOUNT for page-cache xa_nodes, but __folio_split() leaves the xa_state's xa_lru unset. That lets a live, memcg-charged xa_node exist without being linked into the mapping's shadow_nodes list_lru; when reclaim later walks the list_lru it trips VM_WARN_ON(!css_is_dying()). Use mapping_set_update() to install both the workingset update callback and the shadow_nodes list_lru on the xa_state.

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Meta Information

Published
2026-09-03
Last Modified
2026-09-03
Generated
2026-09-03
AI Q&A
2026-09-03
EPSS Evaluated
N/A
NVD
CVE-2026-80729
EUVD
EUVD-2026-70333

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a Linux kernel vulnerability where a bug in memory management allows a memory cgroup charged xa_node to exist without proper linking. This can cause a VM_WARN_ON trigger during reclaim operations due to missing workingset state initialization before folio split.

Impact Analysis

The vulnerability may lead to kernel warnings or crashes during memory reclaim operations, potentially causing system instability or denial of service in affected Linux systems.

Mitigation Strategies

Update the Linux kernel to the latest stable version that includes the fix for CVE-2026-80729. Monitor kernel security advisories for patches and apply them promptly.

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