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USN-2759-1: Linux kernel vulnerabilities

1 October 2015

Several security issues were fixed in the kernel.

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Releases

Packages

Details

It was discovered that an integer overflow error existed in the SCSI
generic (sg) driver in the Linux kernel. A local attacker with write
permission to a SCSI generic device could use this to cause a denial of
service (system crash) or potentially escalate their privileges.
(CVE-2015-5707)

Marc-André Lureau discovered that the vhost driver did not properly
release the userspace provided log file descriptor. A privileged attacker
could use this to cause a denial of service (resource exhaustion).
(CVE-2015-6252)

It was discovered that the Linux kernel's perf subsystem did not bound
callchain backtraces on PowerPC 64. A local attacker could use this to
cause a denial of service. (CVE-2015-6526)

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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.

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Update instructions

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

Ubuntu 12.04

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.

References

Related notices

  • USN-2734-1: linux-image-3.13.0-63-powerpc-e500mc, linux, linux-image-3.13.0-63-powerpc-smp, linux-image-3.13.0-63-powerpc64-emb, linux-image-3.13.0-63-powerpc64-smp, linux-image-3.13.0-63-powerpc-e500, linux-image-3.13.0-63-generic-lpae, linux-image-3.13.0-63-generic, linux-image-3.13.0-63-lowlatency, linux-image-extra-3.13.0-63-generic
  • USN-2750-1: linux-image-3.16.0-50-generic-lpae, linux-image-3.16.0-50-powerpc64-smp, linux-lts-utopic, linux-image-3.16.0-50-powerpc-e500mc, linux-image-3.16.0-50-powerpc-smp, linux-image-extra-3.16.0-50-generic, linux-image-3.16.0-50-lowlatency, linux-image-3.16.0-50-powerpc64-emb, linux-image-3.16.0-50-generic
  • USN-2733-1: linux-lts-trusty, linux-image-3.13.0-63-generic, linux-image-3.13.0-63-generic-lpae
  • USN-2760-1: linux-image-3.2.0-1471-omap4, linux-ti-omap4
  • USN-2737-1: linux-image-3.19.0-28-lowlatency, linux-image-3.19.0-28-powerpc64-emb, linux-lts-vivid, linux-image-3.19.0-28-powerpc-e500mc, linux-image-3.19.0-28-powerpc-smp, linux-image-3.19.0-28-generic, linux-image-3.19.0-28-powerpc64-smp, linux-image-extra-3.19.0-28-generic, linux-image-3.19.0-28-generic-lpae
  • USN-2738-1: linux-image-3.19.0-28-lowlatency, linux-image-3.19.0-28-powerpc64-emb, linux, linux-image-3.19.0-28-powerpc-e500mc, linux-image-3.19.0-28-powerpc-smp, linux-image-3.19.0-28-generic, linux-image-3.19.0-28-powerpc64-smp, linux-image-3.19.0-28-generic-lpae
  • USN-2777-1: linux-image-3.16.0-51-powerpc-smp, linux-image-3.16.0-51-powerpc64-emb, linux-image-3.16.0-51-lowlatency, linux-lts-utopic, linux-image-3.16.0-51-generic, linux-image-3.16.0-51-powerpc64-smp, linux-image-3.16.0-51-generic-lpae, linux-image-extra-3.16.0-51-generic, linux-image-3.16.0-51-powerpc-e500mc
  • USN-2748-1: linux-image-3.13.0-65-powerpc64-smp, linux-image-extra-3.13.0-65-generic, linux-image-3.13.0-65-generic, linux, linux-image-3.13.0-65-lowlatency, linux-image-3.13.0-65-powerpc-e500mc, linux-image-3.13.0-65-powerpc64-emb, linux-image-3.13.0-65-powerpc-smp, linux-image-3.13.0-65-generic-lpae, linux-image-3.13.0-65-powerpc-e500
  • USN-2751-1: linux-image-3.19.0-30-generic, linux-image-3.19.0-30-powerpc-smp, linux-lts-vivid, linux-image-3.19.0-30-lowlatency, linux-image-extra-3.19.0-30-generic, linux-image-3.19.0-30-powerpc64-smp, linux-image-3.19.0-30-powerpc64-emb, linux-image-3.19.0-30-generic-lpae, linux-image-3.19.0-30-powerpc-e500mc
  • USN-2749-1: linux-lts-trusty, linux-image-3.13.0-65-generic, linux-image-3.13.0-65-generic-lpae
  • USN-2752-1: linux-image-3.19.0-30-generic, linux, linux-image-3.19.0-30-powerpc-smp, linux-image-3.19.0-30-lowlatency, linux-image-3.19.0-30-powerpc64-smp, linux-image-3.19.0-30-powerpc64-emb, linux-image-3.19.0-30-generic-lpae, linux-image-3.19.0-30-powerpc-e500mc

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