Ubuntu 2684-1: Linux kernel vulnerabilities

    Date23 Jul 2015
    CategoryUbuntu
    35
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-2684-1
    July 23, 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 versions:
    
    Ubuntu 15.04:
      linux-image-3.19.0-23-generic   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
      linux-image-3.19.0-23-powerpc-smp  3.19.0-23.24
      linux-image-3.19.0-23-powerpc64-emb  3.19.0-23.24
      linux-image-3.19.0-23-powerpc64-smp  3.19.0-23.24
    
    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-2684-1
      CVE-2015-4692, CVE-2015-4700, CVE-2015-5364, CVE-2015-5366
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/3.19.0-23.24
    
    
    
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