USN-2640-2: Linux kernel regression
21 June 2015
The system could be made to crash under certain conditions.
Releases
Packages
- linux - Linux kernel
Details
The Fix for CVE-2015-1328 introduced a regression into the Linux kernel's
overlayfs file system. The removal of a directory that only exists on the
lower layer results in a kernel panic.
We apologize for the inconvenience.
Original advisory details:
Philip Pettersson discovered a privilege escalation when using overlayfs
mounts inside of user namespaces. A local user could exploit this flaw to
gain administrative privileges on the system.
Update instructions
The problem can be corrected by updating your system to the following package versions:
Ubuntu 12.04
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linux-image-3.2.0-86-generic-pae
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3.2.0-86.124
-
linux-image-3.2.0-86-powerpc64-smp
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3.2.0-86.124
-
linux-image-3.2.0-86-generic
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3.2.0-86.124
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linux-image-3.2.0-86-virtual
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3.2.0-86.124
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linux-image-3.2.0-86-omap
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3.2.0-86.124
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linux-image-3.2.0-86-powerpc-smp
-
3.2.0-86.124
-
linux-image-3.2.0-86-highbank
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3.2.0-86.124
After a standard system update you need to reboot your computer to make
all the necessary changes.