[USN-2681-1] Linux kernel vulnerabilities

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1
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=N749
-----END PGP SIGNATURE-----
==========================================================================
Ubuntu Security Notice USN-2681-1
July 23, 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 versions:

Ubuntu 14.04 LTS:
linux-image-3.13.0-58-generic 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-e500 3.13.0-58.97
linux-image-3.13.0-58-powerpc-e500mc 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-powerpc64-smp 3.13.0-58.97

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:
http://www.ubuntu.com/usn/usn-2681-1
CVE-2015-1805, CVE-2015-4692, CVE-2015-4700, CVE-2015-5364,
CVE-2015-5366

Package Information:
https://launchpad.net/ubuntu/+source/linux/3.13.0-58.97