1. Ubuntu Security Notices
  2. USN-2682-1

USN-2682-1: Linux kernel (Utopic HWE) vulnerabilities

Publication date

23 July 2015

Overview

Several security issues were fixed in the kernel.

Releases

Packages

Details

A flaw was discovered in the kvm (kernel virtual machine) subsystem's
kvm_apic_has_events function. A unprivileged local user could exploit this
flaw to cause a denial of service (system crash). (CVE-2015-4692)

A flaw was discovered in how the Linux kernel handles invalid UDP
checksums. A remote attacker could exploit this flaw to cause a denial of
service using a flood of UDP packets with invalid checksums.
(CVE-2015-5364)

A flaw was discovered in how the Linux kernel handles invalid UDP
checksums. A remote attacker can cause a denial of service against
applications that use epoll by injecting a single packet with an invalid
checksum. (CVE-2015-5366)

A flaw was discovered in the kvm (kernel virtual machine) subsystem's
kvm_apic_has_events function. A unprivileged local user could exploit this
flaw to cause a denial of service (system crash). (CVE-2015-4692)

A flaw was discovered in how the Linux kernel handles invalid UDP
checksums. A remote attacker could exploit this flaw to cause a denial of
service using a flood of UDP packets with invalid checksums.
(CVE-2015-5364)

A flaw was discovered in how the Linux kernel handles invalid UDP
checksums. A remote attacker can cause a denial of service against
applications that use epoll by injecting a single packet with an invalid
checksum. (CVE-2015-5366)

Update instructions

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

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.

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

Ubuntu Release Package Version
14.04 trusty linux-image-3.16.0-44-generic –  3.16.0-44.59~14.04.1
linux-image-3.16.0-44-generic-lpae –  3.16.0-44.59~14.04.1
linux-image-3.16.0-44-lowlatency –  3.16.0-44.59~14.04.1
linux-image-3.16.0-44-powerpc-e500mc –  3.16.0-44.59~14.04.1
linux-image-3.16.0-44-powerpc-smp –  3.16.0-44.59~14.04.1
linux-image-3.16.0-44-powerpc64-emb –  3.16.0-44.59~14.04.1
linux-image-3.16.0-44-powerpc64-smp –  3.16.0-44.59~14.04.1

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References

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