ESB-2018.3057 - [Debian] linux kernel: Multiple vulnerabilities 2018-10-10

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.3057
                           linux security update
                              10 October 2018

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           linux kernel
Publisher:         Debian
Operating System:  Debian GNU/Linux 9
Impact/Access:     Root Compromise        -- Existing Account
                   Access Privileged Data -- Existing Account
                   Denial of Service      -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-18021 CVE-2018-15471 

Reference:         ESB-2018.3036
                   ESB-2018.2940
                   ESB-2018.2940

Original Bulletin: 
   http://www.debian.org/security/2018/dsa-4313

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Debian Security Advisory DSA-4313-1                   security@debian.org
https://www.debian.org/security/                     Salvatore Bonaccorso
October 08, 2018                      https://www.debian.org/security/faq
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Package        : linux
CVE ID         : CVE-2018-15471 CVE-2018-18021

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

CVE-2018-15471 (XSA-270)

    Felix Wilhelm of Google Project Zero discovered a flaw in the hash
    handling of the xen-netback Linux kernel module. A malicious or
    buggy frontend may cause the (usually privileged) backend to make
    out of bounds memory accesses, potentially resulting in privilege
    escalation, denial of service, or information leaks.

    https://xenbits.xen.org/xsa/advisory-270.html

CVE-2018-18021

    It was discovered that the KVM subsystem on the arm64 platform does
    not properly handle the KVM_SET_ON_REG ioctl. An attacker who can
    create KVM based virtual machines can take advantage of this flaw
    for denial of service (hypervisor panic) or privilege escalation
    (arbitrarily redirect the hypervisor flow of control with full
    register control).

For the stable distribution (stretch), these problems have been fixed in
version 4.9.110-3+deb9u6.

We recommend that you upgrade your linux packages.

For the detailed security status of linux please refer to its security
tracker page at:
https://security-tracker.debian.org/tracker/linux

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: debian-security-announce@lists.debian.org
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