USN-2681-1: Linux kernel vulnerabilities

Ubuntu Security Notice USN-2681-1

23rd July, 2015

linux 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 - Linux kernel

Details

A flaw was discovered in the user space memory copying for the pipe iovecs
in the Linux kernel. An unprivileged local user could exploit this flaw to
cause a denial of service (system crash) or potentially escalate their
privileges. (CVE-2015-1805)

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 14.04 LTS:

linux-image-3.13.0-58-powerpc64-smp 3.13.0-58.97

linux-image-3.13.0-58-powerpc-e500 3.13.0-58.97

linux-image-3.13.0-58-generic 3.13.0-58.97

linux-image-3.13.0-58-powerpc-smp 3.13.0-58.97

linux-image-3.13.0-58-powerpc64-emb 3.13.0-58.97

linux-image-3.13.0-58-generic-lpae 3.13.0-58.97

linux-image-3.13.0-58-lowlatency 3.13.0-58.97

linux-image-3.13.0-58-powerpc-e500mc 3.13.0-58.97

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-2015-1805, CVE-2015-4692, CVE-2015-4700, CVE-2015-5364, CVE-2015-5366

from Ubuntu Security Notices http://ift.tt/1IhtrAh