USN-1432-1: Linux kernel vulnerabilities
8 May 2012
Several security issues were fixed in the kernel.
Releases
Packages
- 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)
Tetsuo Handa reported a flaw in the OOM (out of memory) killer of the Linux
kernel. A local unprivileged user can exploit this flaw to cause system
unstability and denial of services. (CVE-2012-4398)
Update instructions
The problem can be corrected by updating your system to the following package versions:
Ubuntu 11.04
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linux-image-2.6.38-15-powerpc
-
2.6.38-15.59
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linux-image-2.6.38-15-omap
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2.6.38-15.59
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linux-image-2.6.38-15-generic-pae
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2.6.38-15.59
-
linux-image-2.6.38-15-server
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2.6.38-15.59
-
linux-image-2.6.38-15-powerpc64-smp
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2.6.38-15.59
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linux-image-2.6.38-15-virtual
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2.6.38-15.59
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linux-image-2.6.38-15-versatile
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2.6.38-15.59
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linux-image-2.6.38-15-generic
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2.6.38-15.59
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linux-image-2.6.38-15-powerpc-smp
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2.6.38-15.59
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.