USN-2468-1: Linux kernel vulnerabilities

13 January 2015

linux vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 14.10

Summary

Several security issues were fixed in the kernel.

Software Description

  • linux - Linux kernel

Details

A null pointer dereference flaw was discovered in the the Linux kernel’s SCTP implementation when ASCONF is used. A remote attacker could exploit this flaw to cause a denial of service (system crash) via a malformed INIT chunk. (CVE-2014-7841)

A race condition with MMIO and PIO transactions in the KVM (Kernel Virtual Machine) subsystem of the Linux kernel was discovered. A guest OS user could exploit this flaw to cause a denial of service (guest OS crash) via a specially crafted application. (CVE-2014-7842)

Miloš Prchlík reported a flaw in how the ARM64 platform handles a single byte overflow in __clear_user. A local user could exploit this flaw to cause a denial of service (system crash) by reading one byte beyond a /dev/zero page boundary. (CVE-2014-7843)

A stack buffer overflow was discovered in the ioctl command handling for the Technotrend/Hauppauge USB DEC devices driver. A local user could exploit this flaw to cause a denial of service (system crash) or possibly gain privileges. (CVE-2014-8884)

Update instructions

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

Ubuntu 14.10
linux-image-3.16.0-29-generic - 3.16.0-29.39
linux-image-3.16.0-29-generic-lpae - 3.16.0-29.39
linux-image-3.16.0-29-lowlatency - 3.16.0-29.39
linux-image-3.16.0-29-powerpc-e500mc - 3.16.0-29.39
linux-image-3.16.0-29-powerpc-smp - 3.16.0-29.39
linux-image-3.16.0-29-powerpc64-emb - 3.16.0-29.39
linux-image-3.16.0-29-powerpc64-smp - 3.16.0-29.39

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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