USN-2683-1: Linux kernel (Vivid HWE) vulnerabilities

23 July 2015

linux-lts-vivid 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-vivid - Linux hardware enablement kernel from Vivid

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 versions:

Ubuntu 14.04 LTS
linux-image-3.19.0-23-generic - 3.19.0-23.24~14.04.1
linux-image-3.19.0-23-generic-lpae - 3.19.0-23.24~14.04.1
linux-image-3.19.0-23-lowlatency - 3.19.0-23.24~14.04.1
linux-image-3.19.0-23-powerpc-e500mc - 3.19.0-23.24~14.04.1
linux-image-3.19.0-23-powerpc-smp - 3.19.0-23.24~14.04.1
linux-image-3.19.0-23-powerpc64-emb - 3.19.0-23.24~14.04.1
linux-image-3.19.0-23-powerpc64-smp - 3.19.0-23.24~14.04.1

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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