Ubuntu Security Notice USN-2638-1
10th June, 2015
linux vulnerabilities
A security issue affects these releases of Ubuntu and its
derivatives:
- Ubuntu 15.04
Summary
Several security issues were fixed in the kernel.
Software description
- linux
– Linux kernel
Details
Xiong Zhou discovered a bug in the way the EXT4 filesystem handles
fallocate zero range functionality when the page size is greater than the
block size. A local attacker could exploit this flaw to cause a denial of
service (system crash). (CVE-2015-0275)
Wen Xu discovered a use-after-free flaw in the Linux kernel’s ipv4 ping
support. A local user could exploit this flaw to cause a denial of service
(system crash) or gain administrative privileges on the system.
(CVE-2015-3636)
A memory corruption flaw was discovered in the Linux kernel’s scsi
subsystem. A local attacker could potentially exploit this flaw to cause a
denial of service (system crash). (CVE-2015-4036)
Update instructions
The problem can be corrected by updating your system to the following
package version:
- Ubuntu 15.04:
-
linux-image-3.19.0-20-powerpc-smp
3.19.0-20.20
-
linux-image-3.19.0-20-powerpc-e500mc
3.19.0-20.20
-
linux-image-3.19.0-20-generic-lpae
3.19.0-20.20
-
linux-image-3.19.0-20-generic
3.19.0-20.20
-
linux-image-3.19.0-20-powerpc64-smp
3.19.0-20.20
-
linux-image-3.19.0-20-lowlatency
3.19.0-20.20
-
linux-image-3.19.0-20-powerpc64-emb
3.19.0-20.20
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.