Debian LTS: DLA-1823-1: linux security update

    Date17 Jun 2019
    CategoryDebian LTS
    655
    Posted ByLinuxSecurity Advisories
    Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks.
    Package        : linux
    Version        : 3.16.68-2
    CVE ID         : CVE-2019-3846 CVE-2019-5489 CVE-2019-10126 CVE-2019-11477 
                     CVE-2019-11478 CVE-2019-11479 CVE-2019-11810 CVE-2019-11833 
                     CVE-2019-11884
    
    Several vulnerabilities have been discovered in the Linux kernel that
    may lead to a privilege escalation, denial of service or information
    leaks.
    
    CVE-2019-3846, CVE-2019-10126
    
        huangwen reported multiple buffer overflows in the Marvell wifi
        (mwifiex) driver, which a local user could use to cause denial of
        service or the execution of arbitrary code.
    
    CVE-2019-5489
    
        Daniel Gruss, Erik Kraft, Trishita Tiwari, Michael Schwarz, Ari
        Trachtenberg, Jason Hennessey, Alex Ionescu, and Anders Fogh
        discovered that local users could use the mincore() system call to
        obtain sensitive information from other processes that access the
        same memory-mapped file.
    
    CVE-2019-11477
    
        Jonathan Looney reported that a specially crafted sequence of TCP
        selective acknowledgements (SACKs) allows a remotely triggerable
        kernel panic.
    
    CVE-2019-11478
    
        Jonathan Looney reported that a specially crafted sequence of TCP
        selective acknowledgements (SACKs) will fragment the TCP
        retransmission queue, allowing an attacker to cause excessive
        resource usage.
    
    CVE-2019-11479
    
        Jonathan Looney reported that an attacker could force the Linux
        kernel to segment its responses into multiple TCP segments, each of
        which contains only 8 bytes of data, drastically increasing the
        bandwidth required to deliver the same amount of data.
    
        This update introduces a new sysctl value to control the minimal MSS
        (net.ipv4.tcp_min_snd_mss), which by default uses the formerly hard-
        coded value of 48.  We recommend raising this to 512 unless you know
        that your network requires a lower value.  (This value applies to
        Linux 3.16 only.)
    
    CVE-2019-11810
    
        It was discovered that the megaraid_sas driver did not correctly
        handle a failed memory allocation during initialisation, which
        could lead to a double-free.  This might have some security
        impact, but it cannot be triggered by an unprivileged user.
    
    CVE-2019-11833
    
        It was discovered that the ext4 filesystem implementation writes
        uninitialised data from kernel memory to new extent blocks.  A
        local user able to write to an ext4 filesystem and then read the
        filesystem image, for example using a removable drive, might be
        able to use this to obtain sensitive information.
    
    CVE-2019-11884
    
        It was discovered that the Bluetooth HIDP implementation did not
        ensure that new connection names were null-terminated.  A local
        user with CAP_NET_ADMIN capability might be able to use this to
        obtain sensitive information from the kernel stack.
    
    For Debian 8 "Jessie", these problems have been fixed in version
    3.16.68-2.  Packages for PC architectures (amd64 and i386) are already
    available, and packages for Arm architectures (armel and armhf) will be
    available soon.
    
    We recommend that you upgrade your linux packages.
    
    Further information about Debian LTS security advisories, how to apply
    these updates to your system and frequently asked questions can be
    found at: https://wiki.debian.org/LTS
    
    -- 
    Ben Hutchings - Debian developer, member of kernel, installer and LTS teams
    
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