1. Ubuntu Security Notices
  2. USN-2678-1

USN-2678-1: Linux kernel vulnerabilities

Publication date

23 July 2015

Overview

Several security issues were fixed in the kernel.

Releases

Packages

Details

A flaw was discovered in the user space memory copying for the pipe iovecs
in the Linux kernel. An unprivileged local user could exploit this flaw to
cause a denial of service (system crash) or potentially escalate their
privileges. (CVE-2015-1805)

Daniel Borkmann reported a kernel crash in the Linux kernel’s BPF filter
JIT optimization. A local attacker could exploit this flaw to cause a
denial of service (system crash). (CVE-2015-4700)

A flaw was discovered in the user space memory copying for the pipe iovecs
in the Linux kernel. An unprivileged local user could exploit this flaw to
cause a denial of service (system crash) or potentially escalate their
privileges. (CVE-2015-1805)

Daniel Borkmann reported a kernel crash in the Linux kernel’s BPF filter
JIT optimization. A local attacker could exploit this flaw to cause a
denial of service (system crash). (CVE-2015-4700)

Update instructions

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. If you use linux-restricted-modules, you have to update that package as well to get modules which work with the new kernel version. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-server, linux-powerpc), a standard system upgrade will automatically perform this as well.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release Package Version
12.04 precise linux-image-3.2.0-88-generic-pae –  3.2.0-88.126
linux-image-3.2.0-88-powerpc64-smp –  3.2.0-88.126
linux-image-3.2.0-88-virtual –  3.2.0-88.126
linux-image-3.2.0-88-omap –  3.2.0-88.126
linux-image-3.2.0-88-generic –  3.2.0-88.126
linux-image-3.2.0-88-powerpc-smp –  3.2.0-88.126
linux-image-3.2.0-88-highbank –  3.2.0-88.126

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Get Ubuntu Pro

References

Have additional questions?

Talk to a member of the team ›