--- title: "CVE-2006-0744\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-2006-0744?format=md keywords: index, follow --- # CVE-2006-0744 Publication date 18 April 2006 Last updated 17 July 2025 --- Ubuntu priority **Medium** [Why this priority?](https://ubuntu.com/security/cves/about#priority ) Toggle side navigation ## Description Linux kernel before 2.6.16.5 does not properly handle uncanonical return addresses on Intel EM64T CPUs, which reports an exception in the SYSRET instead of the next instruction, which causes the kernel exception handler to run on the user stack with the wrong GS. ## Status Show unmaintained releases | Package | Ubuntu Release | Status | | --- | --- | --- | | 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 | --- * [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-2006-0744) * [NVD](https://nvd.nist.gov/vuln/detail/CVE-2006-0744) * [Launchpad](https://launchpad.net/bugs/cve/CVE-2006-0744) * [Debian](https://security-tracker.debian.org/tracker/CVE-2006-0744) ### Related Ubuntu Security Notices (USN) + [USN-302-1](https://usn.ubuntu.com/USN-302-1) + Linux kernel vulnerabilities + 15 June 2006 ### Other references *