USN-1704-1: Linux kernel (Quantal HWE) vulnerabilities

22 January 2013

linux-lts-quantal - Linux kernel hardware enablement from Quantal vulnerabilities

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

  • Ubuntu 12.04 LTS

Summary

Several security issues were fixed in the kernel.

Software Description

  • linux-lts-quantal - Linux kernel LTS from Quantal

Details

Brad Spengler discovered a flaw in the Linux kernel’s uname system call. An unprivileged user could exploit this flaw to read kernel stack memory. (CVE-2012-0957)

Jon Howell reported a flaw in the Linux kernel’s KVM (Kernel-based virtual machine) subsystem’s handling of the XSAVE feature. On hosts, using qemu userspace, without the XSAVE feature an unprivileged local attacker could exploit this flaw to crash the system. (CVE-2012-4461)

Dmitry Monakhov reported a race condition flaw the Linux ext4 filesystem that can expose stale data. An unprivileged user could exploit this flaw to cause an information leak. (CVE-2012-4508)

A flaw was discovered in the Linux kernel’s handling of script execution when module loading is enabled. A local attacker could exploit this flaw to cause a leak of kernel stack contents. (CVE-2012-4530)

Rodrigo Freire discovered a flaw in the Linux kernel’s TCP illinois congestion control algorithm. A local attacker could use this to cause a denial of service. (CVE-2012-4565)

A flaw was discovered in the Linux kernel’s handling of new hot-plugged memory. An unprivileged local user could exploit this flaw to cause a denial of service by crashing the system. (CVE-2012-5517)

Florian Weimer discovered that hypervkvpd, which is distributed in the Linux kernel, was not correctly validating source addresses of netlink packets. An untrusted local user can cause a denial of service by causing hypervkvpd to exit. (CVE-2012-5532)

An information leak was discovered in the Linux kernel’s /dev/dvb device. A local user could exploit this flaw to obtain sensitive information from the kernel’s stack memory. (CVE-2013-1928)

Update instructions

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

Ubuntu 12.04 LTS
linux-image-3.5.0-22-generic - 3.5.0-22.34~precise1

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