Ubuntu Security Notice 2522-2 – USN-2522-1 fixed vulnerabilities in ICU. On Ubuntu 12.04 LTS, the font patches caused a regression when using LibreOffice Calc. The patches have been temporarily backed out until the regression is investigated. It was discovered that ICU incorrectly handled memory operations when processing fonts. If an application using ICU processed crafted data, an attacker could cause it to crash or potentially execute arbitrary code with the privileges of the user invoking the program. This issue only affected Ubuntu 12.04 LTS. It was discovered that ICU incorrectly handled memory operations when processing fonts. If an application using ICU processed crafted data, an attacker could cause it to crash or potentially execute arbitrary code with the privileges of the user invoking the program. Various other issues were also addressed.