[Date Prev][Date Next] [Thread Prev][Thread Next] [Date Index] [Thread Index]

[SECURITY] [DLA 1823-1] linux security update

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 

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

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.


    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.


    Jonathan Looney reported that a specially crafted sequence of TCP
    selective acknowledgements (SACKs) allows a remotely triggerable
    kernel panic.


    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.


    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.)


    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.


    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.


    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

Attachment: signature.asc
Description: This is a digitally signed message part

Reply to: