USN-2829-1: Linux kernel vulnerabilities

04 December 2015

Several security issues were fixed in the kernel.

Releases

Packages

Details

It was discovered that the SCTP protocol implementation in the Linux kernel
performed an incorrect sequence of protocol-initialization steps. A local
attacker could use this to cause a denial of service (system crash).
(CVE-2015-5283)

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).
(CVE-2015-7872)

Update instructions

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

Ubuntu 15.04

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.

Related notices

  • USN-2824-1: linux-lts-utopic, linux-image-3.16.0-55-lowlatency, linux-image-3.16.0-55-powerpc64-smp, linux-image-3.16.0-55-generic, linux-image-3.16.0-55-generic-lpae, linux-image-3.16.0-55-powerpc-smp, linux-image-3.16.0-55-powerpc64-emb, linux-image-3.16.0-55-powerpc-e500mc, linux-image-extra-3.16.0-55-generic
  • USN-2823-1: linux, linux-image-3.13.0-71-powerpc-e500mc, linux-image-3.13.0-71-powerpc64-smp, linux-image-extra-3.13.0-71-generic, linux-image-3.13.0-71-powerpc64-emb, linux-image-3.13.0-71-lowlatency, linux-image-3.13.0-71-generic, linux-image-3.13.0-71-powerpc-e500, linux-image-3.13.0-71-powerpc-smp, linux-image-3.13.0-71-generic-lpae
  • USN-2829-2: linux-image-3.19.0-39-powerpc-e500mc, linux-image-3.19.0-39-lowlatency, linux-lts-vivid, linux-image-3.19.0-39-powerpc64-smp, linux-image-extra-3.19.0-39-generic, linux-image-3.19.0-39-generic-lpae, linux-image-3.19.0-39-generic, linux-image-3.19.0-39-powerpc-smp, linux-image-3.19.0-39-powerpc64-emb
  • USN-2843-2: linux-image-4.2.0-21-lowlatency, linux-image-4.2.0-21-generic, linux-image-extra-4.2.0-21-generic, linux-lts-wily, linux-image-4.2.0-21-powerpc64-smp, linux-image-4.2.0-21-generic-lpae, linux-image-4.2.0-21-powerpc-e500mc, linux-image-4.2.0-21-powerpc64-emb, linux-image-4.2.0-21-powerpc-smp
  • USN-2843-3: linux-image-4.2.0-1016-raspi2, linux-raspi2
  • USN-2840-1: linux, linux-image-3.2.0-96-generic-pae, linux-image-3.2.0-96-omap, linux-image-3.2.0-96-virtual, linux-image-3.2.0-96-powerpc64-smp, linux-image-3.2.0-96-powerpc-smp, linux-image-3.2.0-96-highbank, linux-image-3.2.0-96-generic
  • USN-2797-1: linux-lts-utopic, linux-image-3.16.0-52-powerpc-e500mc, linux-image-3.16.0-52-powerpc64-emb, linux-image-3.16.0-52-lowlatency, linux-image-3.16.0-52-generic, linux-image-3.16.0-52-powerpc64-smp, linux-image-3.16.0-52-powerpc-smp, linux-image-extra-3.16.0-52-generic, linux-image-3.16.0-52-generic-lpae
  • USN-2826-1: linux-lts-trusty, linux-image-3.13.0-71-generic, linux-image-3.13.0-71-generic-lpae
  • USN-2843-1: linux, linux-image-4.2.0-21-lowlatency, linux-image-4.2.0-21-generic, linux-image-4.2.0-21-powerpc64-smp, linux-image-4.2.0-21-generic-lpae, linux-image-4.2.0-21-powerpc-e500mc, linux-image-4.2.0-21-powerpc64-emb, linux-image-4.2.0-21-powerpc-smp
  • USN-2840-2: linux-image-3.2.0-1475-omap4, linux-ti-omap4