Major updates were released to fix the vulnerabilities,patching Linux Kernel,Perl and Apache HTTP server.
Linux Kernel vulnerability:-
A failure to validate input was discovered in the Linux kernel’s Xen netback (network backend) driver. A user in a guest OS may exploit this flaw to cause a denial of service to the guest OS and other guest domains.
Apache HTTP Server vulnerability:-
if a user were tricked into viewing server output during a crafted server request, a remote attacker could exploit this to modify the
contents, or steal confidential data (such as passwords), within the same domain.
A local attacker could use this issue in combination with administrative command(sudo) to possibly escalate privileges.
Perl vulnerability :-
An attacker could use this flaw to perform a denial of service attack against software written in Perl.
The updates can be installed by following the instruction on security upgrades.
Source :- Canonical