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USN-2685-1: Linux kernel vulnerabilities

24 July 2015

Several security issues were fixed in the kernel.




A flaw was discovered in the kvm (kernel virtual machine) subsystem's
kvm_apic_has_events function. A unprivileged local user could exploit this
flaw to cause a denial of service (system crash). (CVE-2015-4692)

A flaw was discovered in how the Linux kernel handles invalid UDP
checksums. A remote attacker could exploit this flaw to cause a denial of
service using a flood of UDP packets with invalid checksums.

A flaw was discovered in how the Linux kernel handles invalid UDP
checksums. A remote attacker can cause a denial of service against
applications that use epoll by injecting a single packet with an invalid
checksum. (CVE-2015-5366)

Update instructions

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

Ubuntu 14.10

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-2682-1: linux-image-3.16.0-44-powerpc-e500mc, linux-image-extra-3.16.0-44-generic, linux-image-3.16.0-44-powerpc-smp, linux-image-3.16.0-44-generic-lpae, linux-image-3.16.0-44-powerpc64-emb, linux-image-3.16.0-44-powerpc64-smp, linux-lts-utopic, linux-image-3.16.0-44-generic, linux-image-3.16.0-44-lowlatency
  • USN-2684-1: linux-image-3.19.0-23-generic-lpae, linux-image-3.19.0-23-generic, linux-image-3.19.0-23-powerpc-smp, linux-image-3.19.0-23-powerpc64-emb, linux, linux-image-3.19.0-23-powerpc64-smp, linux-image-3.19.0-23-lowlatency, linux-image-3.19.0-23-powerpc-e500mc
  • USN-2683-1: linux-image-3.19.0-23-generic-lpae, linux-image-3.19.0-23-generic, linux-image-3.19.0-23-powerpc-smp, linux-image-3.19.0-23-powerpc64-emb, linux-image-extra-3.19.0-23-generic, linux-image-3.19.0-23-powerpc64-smp, linux-lts-vivid, linux-image-3.19.0-23-lowlatency, linux-image-3.19.0-23-powerpc-e500mc
  • USN-2681-1: linux-image-3.13.0-58-powerpc64-smp, linux-image-3.13.0-58-powerpc-e500mc, linux-image-3.13.0-58-powerpc64-emb, linux, linux-image-3.13.0-58-powerpc-smp, linux-image-3.13.0-58-generic-lpae, linux-image-extra-3.13.0-58-generic, linux-image-3.13.0-58-lowlatency, linux-image-3.13.0-58-powerpc-e500, linux-image-3.13.0-58-generic
  • USN-2680-1: linux-image-3.13.0-58-generic-lpae, linux-lts-trusty, linux-image-3.13.0-58-generic
  • USN-2713-1: linux-image-3.2.0-89-powerpc64-smp, linux-image-3.2.0-89-generic-pae, linux-image-3.2.0-89-generic, linux-image-3.2.0-89-powerpc-smp, linux, linux-image-3.2.0-89-highbank, linux-image-3.2.0-89-virtual, linux-image-3.2.0-89-omap
  • USN-2714-1: linux-ti-omap4, linux-image-3.2.0-1469-omap4