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    • CVE-2017-2636 : local kernel privilege escalation

    Posted on

    As I am using Red Hat Insights to regularly check my systems for reliability and stability reasons, I received a notification today that there is a vulnerability affecting the Linux kernel's implementation of the HDLC (High-Level Data Link Control) TTY line discipline implementation. I followed the instructions for a workaround until an updated kernel with the final fix gets released :

    su
     

    echo "install n_hdlc /bin/true" >> /etc/modprobe.d/disable-n_hdlc.conf
     


    reboot

    Once executed 

    sudo /usr/bin/redhat-access-insights
    manually after the restart of the system, the security warning is not reported any more - which is the indication that the security issue was solved successfully. I am sharing this firstly in order to inform other users about this vulnerability and secondly to show how useful Red Hat Insights is and why I recommend to use it.

    Reference :

    https://access.redhat.com/insights/actions/critical

    https://access.redhat.com/security/cve/cve-2017-2636
    https://access.redhat.com/security/vulnerabilities/CVE-2017-2636

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