USN-2682-1: Linux kernel (Utopic HWE) vulnerabilities
Ubuntu Security Notice USN-2682-1
23rd July, 2015
linux-lts-utopic vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 14.04 LTS
Summary
Several security issues were fixed in the kernel.
Software description
- linux-lts-utopic - Linux hardware enablement kernel from Utopic
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)
Update instructions
The problem can be corrected by updating your system to the following package version:
- Ubuntu 14.04 LTS:
- 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-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
- linux-image-3.16.0-44-generic 3.16.0-44.59~14.04.1
- linux-image-3.16.0-44-powerpc-smp 3.16.0-44.59~14.04.1
To update your system, please follow these instructions: http://ift.tt/17VXqjU.
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
CVE-2015-4692, CVE-2015-5364, CVE-2015-5366
from Ubuntu Security Notices http://ift.tt/1KnDL0a