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Ubuntu 15.04 USN-2638-1 Moderate: Kernel Vulnerability Risks

ubuntu
Calendar Grey June 10, 2015
Dist Ubuntu Esm H88
=========================================================================Ubuntu Security Notice USN-
Several security issues were fixed in the kernel.

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)

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu moderate severity system crash Linux kernel crash threat

Update Instructions

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

Ubuntu 15.04:
  linux-image-3.19.0-20-generic   3.19.0-20.20
  linux-image-3.19.0-20-generic-lpae  3.19.0-20.20
  linux-image-3.19.0-20-lowlatency  3.19.0-20.20
  linux-image-3.19.0-20-powerpc-e500mc  3.19.0-20.20
  linux-image-3.19.0-20-powerpc-smp  3.19.0-20.20
  linux-image-3.19.0-20-powerpc64-emb  3.19.0-20.20
  linux-image-3.19.0-20-powerpc64-smp  3.19.0-20.20

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-2638-1

CVE-2015-0275, CVE-2015-3636, CVE-2015-4036

June 10, 2015

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu moderate severity system crash Linux kernel crash threat

Package Information

https://launchpad.net/ubuntu/+source/linux/3.19.0-20.20

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