USN-2684-1: Linux kernel vulnerabilities
Ubuntu Security Notice USN-2684-1
23rd July, 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
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)
Daniel Borkmann reported a kernel crash in the Linux kernel's BPF filter
JIT optimization. A local attacker could exploit this flaw to cause a
denial of service (system crash). (CVE-2015-4700)
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 15.04:
- linux-image-3.19.0-23-powerpc64-smp 3.19.0-23.24
- linux-image-3.19.0-23-generic 3.19.0-23.24
- linux-image-3.19.0-23-powerpc64-emb 3.19.0-23.24
- linux-image-3.19.0-23-powerpc-smp 3.19.0-23.24
- linux-image-3.19.0-23-generic-lpae 3.19.0-23.24
- linux-image-3.19.0-23-lowlatency 3.19.0-23.24
- linux-image-3.19.0-23-powerpc-e500mc 3.19.0-23.24
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-2015-4700, CVE-2015-5364, CVE-2015-5366
from Ubuntu Security Notices http://ift.tt/1KnDJp3