Patching Severe Vulnerability in Linux Kernel (CVE-2021-33909) using SanerNow


    A Privilege escalation vulnerability has been found in Linux Kernel’s File system layer which is termed Sequoia. The vulnerability affects all the revisions of Kernel from the year 2014.

    CVE assigned

    Affected software:
    The vulnerability affects Linux Kerne in Ubuntu 20.04, Ubuntu 20.10, Ubuntu 21.04, Debian 11, and Fedora 34. RHEL 6, 7, and 8 and OEL 6, 7, and 8.


    To address this vulnerability, the vendor has released security patches. For more information, please refer to our blog

    Use SanerNow platform to apply this high severity patch quickly across the organization as shown below.

    SanerNow: Vulnerability detection and patching of Linux Kernel:

    1. Login to SanerNow platform

    2. Switch to the account/site specific view and Go to 'VM tool'

    3. If your Kernel application is vulnerable, Saner lists the CVE’s CVE-2021-33909 in 'Top Vulnerabilities' or 'Recently Discovered Vulnerabilities' as shown in the below diagram


    4. Search for this vulnerability in VM tool. If you are affected, apply the patch through PM -> Missing Patches

    5. Select 'Groups/Devices' in the 'Asset Source' section and click 'Apply'.

    6. Select the 'Kernel' product from the 'Asset' section as shown in the below diagram.


    7. Select 'Apply Selected Patches' at the rightmost corner. This will prompt for 'Creating Patching Task'. Fill in 'Task Name' and 'Remediation Schedule' as per your preference and click on 'Apply Selected Patches' as shown below


    8. Remediation job will be created, which will fix the vulnerability by upgrading the software and making the system immune to Linux Kernel vulnerabilities.
    9. Once remediation is done, the Saner agent automatically scans again and upload the result to SanerNow as shown below



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