USN-1607-1: Linux kernel vulnerabilities

11 October 2012

linux vulnerabilities

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

  • Ubuntu 11.10

Summary

Several security issues were fixed in the kernel.

Software Description

  • linux - Linux kernel

Details

Vadim Ponomarev discovered a flaw in the Linux kernel causing a reference leak when PID namespaces are used. A remote attacker could exploit this flaw causing a denial of service. (CVE-2012-2127)

A flaw was found in how the Linux kernel’s KVM (Kernel-based Virtual Machine) subsystem handled MSI (Message Signaled Interrupts). A local unprivileged user could exploit this flaw to cause a denial of service or potentially elevate privileges. (CVE-2012-2137)

Mathias Krause discover an error in Linux kernel’s Datagram Congestion Control Protocol (DCCP) Congestion Control Identifier (CCID) use. A local attack could exploit this flaw to cause a denial of service (crash) and potentially escalate privileges if the user can mmap page 0. (CVE-2013-1827)

Update instructions

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

Ubuntu 11.10
linux-image-3.0.0-26-generic - 3.0.0-26.43
linux-image-3.0.0-26-generic-pae - 3.0.0-26.43
linux-image-3.0.0-26-omap - 3.0.0-26.43
linux-image-3.0.0-26-powerpc - 3.0.0-26.43
linux-image-3.0.0-26-powerpc-smp - 3.0.0-26.43
linux-image-3.0.0-26-powerpc64-smp - 3.0.0-26.43
linux-image-3.0.0-26-server - 3.0.0-26.43
linux-image-3.0.0-26-virtual - 3.0.0-26.43

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.

References