Ubuntu Security Notice USN-765-1 – It was discovered that the upstream security fixes in USN-764-1 introduced a regression which could cause the browser to crash. If a user were tricked into viewing a malicious website, a remote attacker could cause a denial of service or possibly execute arbitrary code with the privileges of the user invoking the program.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/77086/USN-765-1.txt
Source: https://packetstormsecurity.com/files/77086/Ubuntu-Security-Notice-765-1.html