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Ubuntu 12.10 USN-1699-1 Critical: Kernel Denial Of Service Issue

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Calendar Grey January 18, 2013
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Multiple vulnerabilities addressed in Ubuntu 12.10 kernel. Detailed update guidance and severity ratings provided.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux: Linux kernel

Details:

Jon Howell reported a flaw in the Linux kernel's KVM (Kernel-based virtual

machine) subsystem's handling of the XSAVE CPU feature. On hosts without the

XSAVE CPU feature, using qemu userspace, an unprivileged local attacker could

exploit this flaw to crash the system. (CVE-2012-4461)

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)

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)

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu kernel local attack

Update Instructions

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

Ubuntu 12.10:
  linux-image-3.5.0-22-generic    3.5.0-22.34
  linux-image-3.5.0-22-highbank   3.5.0-22.34
  linux-image-3.5.0-22-omap       3.5.0-22.34
  linux-image-3.5.0-22-powerpc-smp  3.5.0-22.34
  linux-image-3.5.0-22-powerpc64-smp  3.5.0-22.34

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

https://ubuntu.com/security/notices/USN-1699-1

CVE-2012-4461, CVE-2012-4530, CVE-2012-5532

Severity
critical
Lowest
Low
Medium
High
Critical

January 18, 2013

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu kernel local attack

Package Information

https://launchpad.net/ubuntu/+source/linux/3.5.0-22.34

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