--- title: "CVE-2006-1056\n | Ubuntu" description: Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things. url: https://ubuntu.com/security/CVE-2006-1056?format=md keywords: index, follow --- # CVE-2006-1056 Publication date 20 April 2006 Last updated 17 July 2025 --- Ubuntu priority **Medium** [Why this priority?](https://ubuntu.com/security/cves/about#priority ) Toggle side navigation ## 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. ## Status Show unmaintained releases | Package | Ubuntu Release | Status | | --- | --- | --- | | kfreebsd-5 | 7.04 feisty | Fixed 5.4-17 | | 6.10 edgy | Fixed 5.4-17 | | 6.06 LTS dapper | Ignored end of life, was needed | | linux-source-2.6.15 | 7.04 feisty | Not in release | | 6.10 edgy | Not in release | | 6.06 LTS dapper | Fixed 2.6.15-29.58 | | linux-source-2.6.17 | 7.04 feisty | Not in release | | 6.10 edgy | Fixed 2.6.17.1-12.40 | | 6.06 LTS dapper | Not in release | | xen-3.0 | 7.04 feisty | Fixed 3.0.3-0ubuntu1 | | 6.10 edgy | Fixed 3.0.3-0ubuntu1 | | 6.06 LTS dapper | Not in release | | xen-3.1 | 7.04 feisty | Not in release | | 6.10 edgy | Not in release | | 6.06 LTS dapper | Not in release | --- * [How can I get the fixes?](https://ubuntu.com/security/cves/about#security) * [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses) ## References * [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1056) * [NVD](https://nvd.nist.gov/vuln/detail/CVE-2006-1056) * [Launchpad](https://launchpad.net/bugs/cve/CVE-2006-1056) * [Debian](https://security-tracker.debian.org/tracker/CVE-2006-1056) ### Related Ubuntu Security Notices (USN) + [USN-302-1](https://usn.ubuntu.com/USN-302-1) + Linux kernel vulnerabilities + 15 June 2006 ### Other references *