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Ubuntu 14.04 LTS: USN-2683-1 Critical Kernel DoS Update

ubuntu
Calendar Grey July 24, 2015
Scroller Ubuntu
Several vulnerabilities resolved in the Ubuntu kernel; update now to reduce DoS threats and improve overall system security.
Several security issues were fixed in the kernel.

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 inva...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical kernel ubuntu linux-lts-vivid

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

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

https://ubuntu.com/security/notices/USN-2683-1

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

Severity
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Critical

July 23, 2015

Topics%20covered

Topics Covered

security advisory denial of service critical kernel ubuntu linux-lts-vivid

Package Information

https://launchpad.net/ubuntu/+source/linux-lts-vivid/3.19.0-23.24~14.04.1

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