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             AUSCERT External Security Bulletin Redistribution

                         linux-4.9 security update
                              2 October 2019


        AusCERT Security Bulletin Summary

Product:           linux-4.9
Publisher:         Debian
Operating System:  Debian GNU/Linux 8
                   Debian GNU/Linux 9
Impact/Access:     Increased Privileges -- Existing Account
                   Denial of Service    -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-15902 CVE-2019-15118 CVE-2019-15117
                   CVE-2019-14835 CVE-2019-14821 CVE-2019-1511

Reference:         ESB-2019.3613

Original Bulletin: 

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Package        : linux-4.9
Version        : 4.9.189-3+deb9u1~deb8u1
CVE ID         : CVE-2019-14821 CVE-2019-14835 CVE-2019-15117 CVE-2019-1511=

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


    Matt Delco reported a race condition in KVM's coalesced MMIO
    facility, which could lead to out-of-bounds access in the kernel.
    A local attacker permitted to access /dev/kvm could use this to
    cause a denial of service (memory corruption or crash) or possibly
    for privilege escalation.


    Peter Pi of Tencent Blade Team discovered a missing bounds check
    in vhost_net, the network back-end driver for KVM hosts, leading
    to a buffer overflow when the host begins live migration of a VM.
    An attacker in control of a VM could use this to cause a denial of
    service (memory corruption or crash) or possibly for privilege
    escalation on the host.


    Hui Peng and Mathias Payer reported a missing bounds check in the
    usb-audio driver's descriptor parsing code, leading to a buffer
    over-read.  An attacker able to add USB devices could possibly use
    this to cause a denial of service (crash).


    Hui Peng and Mathias Payer reported unbounded recursion in the
    usb-audio driver's descriptor parsing code, leading to a stack
    overflow.  An attacker able to add USB devices could use this to
    cause a denial of service (memory corruption or crash) or possibly
    for privilege escalation.  On the amd64 architecture this is
    mitigated by a guard page on the kernel stack, so that it is only
    possible to cause a crash.


    Brad Spengler reported that a backporting error reintroduced a
    spectre-v1 vulnerability in the ptrace subsystem in the
    ptrace_get_debugreg() function.

For Debian 8 "Jessie", these problems have been fixed in version

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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