Debian: DSA-3426-1: linux security update

    Date17 Dec 2015
    CategoryDebian
    92
    Posted ByLinuxSecurity Advisories
    Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service, information leak or data loss.
    
    - -------------------------------------------------------------------------
    Debian Security Advisory DSA-3426-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.debian.org/security/                     Salvatore Bonaccorso
    December 17, 2015                     https://www.debian.org/security/faq
    - -------------------------------------------------------------------------
    
    Package        : linux
    CVE ID         : CVE-2013-7446 CVE-2015-7799 CVE-2015-7833 CVE-2015-8104
                     CVE-2015-8374 CVE-2015-8543
    
    Several vulnerabilities have been discovered in the Linux kernel that
    may lead to a privilege escalation, denial of service, information leak
    or data loss.
    
    CVE-2013-7446
    
        Dmitry Vyukov discovered that a particular sequence of valid
        operations on local (AF_UNIX) sockets can result in a
        use-after-free. This may be used to cause a denial of service
        (crash) or possibly for privilege escalation.
    
    CVE-2015-7799
    
        It was discovered that a user granted access to /dev/ppp can cause a
        denial of service (crash) by passing invalid parameters to the
        PPPIOCSMAXCID ioctl. This also applies to ISDN PPP device nodes.
    
    CVE-2015-7833
    
        Sergej Schumilo, Hendrik Schwartke and Ralf Spenneberg discovered a
        flaw in the processing of certain USB device descriptors in the
        usbvision driver. An attacker with physical access to the system can
        use this flaw to crash the system. This was partly fixed by the
        changes listed in DSA 3396-1.
    
    CVE-2015-8104
    
        Jan Beulich reported a guest to host denial-of-service flaw
        affecting the KVM hypervisor running on AMD processors. A malicious
        guest can trigger an infinite stream of "debug" (#DB) exceptions
        causing the processor microcode to enter an infinite loop where the
        core never receives another interrupt. This leads to a panic of the
        host kernel.
    
    CVE-2015-8374
    
        It was discovered that Btrfs did not correctly implement truncation
        of compressed inline extents. This could lead to an information
        leak, if a file is truncated and later made readable by other users.
        Additionally, it could cause data loss. This has been fixed for the
        stable distribution (jessie) only.
    
    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 in their user namespace. This has been fixed for the
        stable distribution (jessie) only.
    
    For the oldstable distribution (wheezy), these problems have been fixed
    in version 3.2.73-2+deb7u1. In addition, this update contains several
    changes originally targeted for the upcoming Wheezy point release.
    
    For the stable distribution (jessie), these problems have been fixed in
    version 3.16.7-ckt20-1+deb8u1. In addition, this update contains several
    changes originally targeted for the upcoming Jessie point release.
    
    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: This email address is being protected from spambots. You need JavaScript enabled to view it.
    
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