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USN-2689-1: Linux kernel (Utopic HWE) vulnerabilities

28 July 2015

Several security issues were fixed in the kernel.

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Releases

Packages

Details

Andy Lutomirski discovered a flaw in the Linux kernel's handling of nested
NMIs (non-maskable interrupts). An unprivileged local user could exploit
this flaw to cause a denial of service (system crash) or potentially
escalate their privileges. (CVE-2015-3290)

Colin King discovered a flaw in the add_key function of the Linux kernel's
keyring subsystem. A local user could exploit this flaw to cause a denial
of service (memory exhaustion). (CVE-2015-1333)

Andy Lutomirski discovered a flaw that allows user to cause the Linux
kernel to ignore some NMIs (non-maskable interrupts). A local unprivileged
user could exploit this flaw to potentially cause the system to miss
important NMIs resulting in unspecified effects. (CVE-2015-3291)

Andy Lutomirski and Petr Matousek discovered that an NMI (non-maskable
interrupt) that interrupts userspace and encounters an IRET fault is
incorrectly handled by the Linux kernel. An unprivileged local user could
exploit this flaw to cause a denial of service (kernel OOPs), corruption,
or potentially escalate privileges on the system. (CVE-2015-5157)

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.

Learn more about Ubuntu Pro

Update instructions

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

Ubuntu 14.04

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-2688-1: linux-image-3.13.0-59-powerpc-e500mc, linux, linux-image-3.13.0-59-powerpc-smp, linux-image-extra-3.13.0-59-generic, linux-image-3.13.0-59-generic-lpae, linux-image-3.13.0-59-powerpc64-emb, linux-image-3.13.0-59-generic, linux-image-3.13.0-59-powerpc64-smp, linux-image-3.13.0-59-powerpc-e500, linux-image-3.13.0-59-lowlatency
  • USN-2691-1: linux, linux-image-3.19.0-25-generic, linux-image-3.19.0-25-powerpc-smp, linux-image-3.19.0-25-lowlatency, linux-image-3.19.0-25-powerpc64-emb, linux-image-3.19.0-25-powerpc-e500mc, linux-image-3.19.0-25-generic-lpae, linux-image-3.19.0-25-powerpc64-smp
  • USN-2690-1: linux-lts-vivid, linux-image-3.19.0-25-generic, linux-image-3.19.0-25-powerpc-smp, linux-image-extra-3.19.0-25-generic, linux-image-3.19.0-25-lowlatency, linux-image-3.19.0-25-powerpc64-emb, linux-image-3.19.0-25-powerpc-e500mc, linux-image-3.19.0-25-generic-lpae, linux-image-3.19.0-25-powerpc64-smp
  • USN-2687-1: linux-image-3.13.0-59-generic-lpae, linux-image-3.13.0-59-generic, linux-lts-trusty