CVE-2018-3665

Published: 13 June 2018

System software utilizing Lazy FP state restore technique on systems using Intel Core-based microprocessors may potentially allow a local process to infer data from another process through a speculative execution side channel.

From the Ubuntu Security Team

Julian Stecklina and Thomas Prescher discovered that FPU register states (such as MMX, SSE, and AVX registers) which are lazily restored are potentially vulnerable to a side channel attack. A local attacker could use this to expose sensitive information.

Notes

Xenial and Trusty are affected when running on older x86 processors
that do not have support for the xsaveopt instruction. You can verify if your
system has support for xsaveopt by locating the "xsaveopt" feature listed in
the flags section of the /proc/cpuinfo file.
Precise is affected on all x86 processors.

Status

Severity score breakdown

References

• https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00145.html
• https://ubuntu.com/security/notices/USN-3696-1
• https://ubuntu.com/security/notices/USN-3696-2
• https://ubuntu.com/security/notices/USN-3698-1
• https://ubuntu.com/security/notices/USN-3698-2
• https://www.cve.org/CVERecord?id=CVE-2018-3665
• NVD
• Launchpad
• Debian