Debian LTS: DLA-1824-1: linux-4.9 security update

    Date18 Jun 2019
    CategoryDebian LTS
    422
    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-4.9
    Version        : 4.9.168-1+deb9u3~deb8u1
    CVE ID         : CVE-2019-3846 CVE-2019-5489 CVE-2019-9500 CVE-2019-9503 
                     CVE-2019-10126 CVE-2019-11477 CVE-2019-11478 CVE-2019-11479 
                     CVE-2019-11486 CVE-2019-11599 CVE-2019-11815 CVE-2019-11833 
                     CVE-2019-11884
    Debian Bug     : 928989
    
    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-2019-9500, CVE-2019-9503
    
        Hugues Anguelkov discovered a buffer overflow and missing access
        validation in the Broadcom FullMAC wifi driver (brcmfmac), which a
        attacker on the same wifi network could use to cause denial of
        service or the execution of arbitrary code.
    
    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 536 unless you know
        that your network requires a lower value.
    
    CVE-2019-11486
    
        Jann Horn of Google reported numerous race conditions in the
        Siemens R3964 line discipline. A local user could use these to
        cause unspecified security impact. This module has therefore been
        disabled.
    
    CVE-2019-11599
    
        Jann Horn of Google reported a race condition in the core dump
        implementation which could lead to a use-after-free.  A local
        user could use this to read sensitive information, to cause a
        denial of service (memory corruption), or for privilege
        escalation.
    
    CVE-2019-11815
    
        It was discovered that a use-after-free in the Reliable Datagram
        Sockets protocol could result in denial of service and potentially
        privilege escalation.  This protocol module (rds) is not auto-
        loaded on Debian systems, so this issue only affects systems where
        it is explicitly loaded.
    
    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
    4.9.168-1+deb9u3~deb8u1.
    
    We recommend that you upgrade your linux-4.9 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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