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Debian Security Advisory DSA-3434-1                   security@debian.org
https://www.debian.org/security/                            Ben Hutchings
January 05, 2016                      https://www.debian.org/security/faq
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Package        : linux
CVE ID         : CVE-2015-7513 CVE-2015-7550 CVE-2015-8543 CVE-2015-8550
                 CVE-2015-8551 CVE-2015-8552 CVE-2015-8569 CVE-2015-8575
                 CVE-2015-8709
Debian Bug     : 808293 808602 808953 808973

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

CVE-2015-7513

    It was discovered that a local user permitted to use the x86 KVM
    subsystem could configure the PIT emulation to cause a denial of
    service (crash).

CVE-2015-7550

    Dmitry Vyukov discovered a race condition in the keyring subsystem
    that allows a local user to cause a denial of service (crash).

CVE-2015-8543

    It was discovered that a local user permitted to create raw sockets
    could cause a denial-of-service by specifying an invalid protocol
    number for the socket. The attacker must have the CAP_NET_RAW
    capability.

CVE-2015-8550

    Felix Wilhelm of ERNW discovered that the Xen PV backend drivers    may read critical data from shared memory multiple times. This
    flaw can be used by a guest kernel to cause a denial of service
    (crash) on the host, or possibly for privilege escalation.

CVE-2015-8551 / CVE-2015-8552

    Konrad Rzeszutek Wilk of Oracle discovered that the Xen PCI
    backend driver does not adequately validate the device state when
    a guest configures MSIs. This flaw can be used by a guest kernel
    to cause a denial of service (crash or disk space exhaustion) on
    the host.

CVE-2015-8569

    Dmitry Vyukov discovered a flaw in the PPTP sockets implementation
    that leads to an information leak to local users.

CVE-2015-8575

    David Miller discovered a flaw in the Bluetooth SCO sockets
    implementation that leads to an information leak to local users.

CVE-2015-8709

    Jann Horn discovered a flaw in the permission checks for use of
    the ptrace feature. A local user who has the CAP_SYS_PTRACE
    capability within their own user namespace could use this flaw for
    privilege escalation if a more privileged process ever enters that
    user namespace. This affects at least the LXC system.

In addition, this update fixes some regressions in the previous update:

#808293

    A regression in the UDP implementation prevented freeradius and
    some other applications from receiving data.

#808602 / #808953

    A regression in the USB XHCI driver prevented use of some devices
    in USB 3 SuperSpeed ports.

#808973

    A fix to the radeon driver interacted with an existing bug to
    cause a crash at boot when using some AMD/ATI graphics cards.
    This issue only affects wheezy.

For the oldstable distribution (wheezy), these problems have been fixed
in version 3.2.73-2+deb7u2. The oldstable distribution (wheezy) is not
affected by CVE-2015-8709.

For the stable distribution (jessie), these problems have been fixed in
version 3.16.7-ckt20-1+deb8u2. CVE-2015-8543 was already fixed in
version 3.16.7-ckt20-1+deb8u1.

For the unstable distribution (sid), these problems have been fixed in
version 4.3.3-3 or earlier.

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/

Mailing list: debian-security-announce@lists.debian.org