USN-2824-1: Linux kernel (Utopic HWE) vulnerability

Releases

• Ubuntu 14.04 ESM

Packages

• linux-lts-utopic - Linux hardware enablement kernel from Utopic

Details

Dmitry Vyukov discovered that the Linux kernel's keyring handler attempted
to garbage collect incompletely instantiated keys. A local unprivileged
attacker could use this to cause a denial of service (system crash).

Update instructions

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

Ubuntu 14.04

• linux-image-3.16.0-55-generic - 3.16.0-55.74~14.04.1
• linux-image-3.16.0-55-generic-lpae - 3.16.0-55.74~14.04.1
• linux-image-3.16.0-55-lowlatency - 3.16.0-55.74~14.04.1
• linux-image-3.16.0-55-powerpc-e500mc - 3.16.0-55.74~14.04.1
• linux-image-3.16.0-55-powerpc-smp - 3.16.0-55.74~14.04.1
• linux-image-3.16.0-55-powerpc64-emb - 3.16.0-55.74~14.04.1
• linux-image-3.16.0-55-powerpc64-smp - 3.16.0-55.74~14.04.1

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

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.

References

• CVE-2015-7872

Related notices

• USN-2823-1: linux-image-3.13.0-71-powerpc-e500mc, linux-image-3.13.0-71-powerpc-smp, linux-image-3.13.0-71-lowlatency, linux-image-3.13.0-71-powerpc64-emb, linux, linux-image-3.13.0-71-powerpc64-smp, linux-image-3.13.0-71-generic-lpae, linux-image-extra-3.13.0-71-generic, linux-image-3.13.0-71-generic, linux-image-3.13.0-71-powerpc-e500
• USN-2843-2: linux-image-4.2.0-21-lowlatency, linux-lts-wily, linux-image-4.2.0-21-powerpc64-smp, linux-image-extra-4.2.0-21-generic, linux-image-4.2.0-21-powerpc64-emb, linux-image-4.2.0-21-generic-lpae, linux-image-4.2.0-21-powerpc-smp, linux-image-4.2.0-21-powerpc-e500mc, linux-image-4.2.0-21-generic
• USN-2840-1: linux-image-3.2.0-96-powerpc-smp, linux-image-3.2.0-96-virtual, linux-image-3.2.0-96-omap, linux, linux-image-3.2.0-96-powerpc64-smp, linux-image-3.2.0-96-highbank, linux-image-3.2.0-96-generic-pae, linux-image-3.2.0-96-generic
• USN-2840-2: linux-ti-omap4, linux-image-3.2.0-1475-omap4
• USN-2829-1: linux-image-3.19.0-39-lowlatency, linux-image-3.19.0-39-powerpc-e500mc, linux, linux-image-3.19.0-39-powerpc64-smp, linux-image-3.19.0-39-generic, linux-image-3.19.0-39-generic-lpae, linux-image-3.19.0-39-powerpc-smp, linux-image-3.19.0-39-powerpc64-emb
• USN-2826-1: linux-lts-trusty, linux-image-3.13.0-71-generic-lpae, linux-image-3.13.0-71-generic
• USN-2829-2: linux-image-3.19.0-39-lowlatency, linux-image-3.19.0-39-powerpc-e500mc, linux-image-3.19.0-39-powerpc64-smp, linux-image-3.19.0-39-generic, linux-image-3.19.0-39-generic-lpae, linux-image-extra-3.19.0-39-generic, linux-lts-vivid, linux-image-3.19.0-39-powerpc-smp, linux-image-3.19.0-39-powerpc64-emb
• USN-2843-1: linux, linux-image-4.2.0-21-lowlatency, linux-image-4.2.0-21-powerpc64-smp, linux-image-4.2.0-21-powerpc64-emb, linux-image-4.2.0-21-generic-lpae, linux-image-4.2.0-21-powerpc-smp, linux-image-4.2.0-21-powerpc-e500mc, linux-image-4.2.0-21-generic
• USN-2843-3: linux-image-4.2.0-1016-raspi2, linux-raspi2