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Wednesday, May 9, 2012

USN-1432-1: Linux kernel vulnerabilities

Ubuntu Security Notice USN-1432-1


8th May, 2012


linux vulnerabilities


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




  • Ubuntu 11.04





Summary


Several security issues were fixed in the kernel.





Software description





  • linux
    - Linux kernel







Details


A flaw was found in the Linux's kernels ext4 file system when mounted with
a journal. A local, unprivileged user could exploit this flaw to cause a
denial of service. (CVE-2011-4086)



A flaw was discovered in the Linux kernel's cifs file system. An
unprivileged local user could exploit this flaw to crash the system leading
to a denial of service. (CVE-2012-1090)



A flaw was found in the Linux kernel's ext4 file system when mounting a
corrupt filesystem. A user-assisted remote attacker could exploit this flaw
to cause a denial of service. (CVE-2012-2100)



Update instructions


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




Ubuntu 11.04:




linux-image-2.6.38-15-powerpc

2.6.38-15.59






linux-image-2.6.38-15-omap

2.6.38-15.59






linux-image-2.6.38-15-generic-pae

2.6.38-15.59






linux-image-2.6.38-15-server

2.6.38-15.59






linux-image-2.6.38-15-powerpc64-smp

2.6.38-15.59






linux-image-2.6.38-15-virtual

2.6.38-15.59






linux-image-2.6.38-15-versatile

2.6.38-15.59






linux-image-2.6.38-15-generic

2.6.38-15.59






linux-image-2.6.38-15-powerpc-smp

2.6.38-15.59






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




CVE-2011-4086,

CVE-2012-1090,

CVE-2012-2100






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