[SECURITY] [DSA 3313-1] linux security update

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Debian Security Advisory DSA-3313-1                   security@debian.org
https://www.debian.org/security/                     Salvatore Bonaccorso
July 23, 2015                         https://www.debian.org/security/faq
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Package        : linux
CVE ID         : CVE-2015-3290 CVE-2015-3291 CVE-2015-4167 CVE-2015-5157
                 CVE-2015-5364 CVE-2015-5366

Several vulnerabilities have been discovered in the Linux kernel that
may lead to a privilege escalation or denial of service.

CVE-2015-3290

    Andy Lutomirski discovered that the Linux kernel does not properly
    handle nested NMIs. A local, unprivileged user could use this flaw
    for privilege escalation.

CVE-2015-3291

    Andy Lutomirski discovered that under certain conditions a malicious
    userspace program can cause the kernel to skip NMIs leading to a
    denial of service.

CVE-2015-4167

    Carl Henrik Lunde discovered that the UDF implementation is missing
    a necessary length check. A local user that can mount devices could
    use this flaw to crash the system.

CVE-2015-5157

    Petr Matousek and Andy Lutomirski discovered that an NMI that
    interrupts userspace and encounters an IRET fault is incorrectly
    handled. A local, unprivileged user could use this flaw for denial
    of service or possibly for privilege escalation.

CVE-2015-5364

    It was discovered that the Linux kernel does not properly handle
    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-2015-5366

    It was discovered that the Linux kernel does not properly handle
    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.

For the stable distribution (jessie), these problems have been fixed in
version 3.16.7-ckt11-1+deb8u2.

For the unstable distribution (sid), these problems have been fixed in
version 4.0.8-2 or earlier versions.

We recommend that you upgrade your linux packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/