QID 198327

Date Published: 2021-04-19

QID 198327: Ubuntu Security Notification for Linux kernel (OEM) vulnerabilities (USN-4911-1)

The nouveau gpu driver in the linux kernel did not properly handle error conditions in some situations
The xen netback backend in the linux kernel did not properly handle certain error conditions under paravirtualization
The fastrpc driver in the linux kernel did not prevent user space applications from sending kernel rpc messages
The fuse user space file system implementation in the linux kernel did not properly handle bad inodes in some situations

A local attacker could use this to cause a denial of service (system crash) (CVE-2020-25639)
An attacker in a guest VM could possibly use this to cause a denial of service (host domain crash) (CVE-2021-28038)
A local attacker could possibly use this to gain elevated privileges (CVE-2021-28375)
A local attacker could possibly use this to cause a denial of service (CVE-2021-28950)

  • CVSS V3 rated as High - 7.8 severity.
  • CVSS V2 rated as High - 7.2 severity.
    • Solution
    Refer to Ubuntu advisory: USN-4911-1 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 198327

    CVE-2020-25639 | CVE-2021-28375 | CVE-2021-28950 | CVE-2021-28038 |
    Software Advisories
    Advisory ID Software Component Link
    USN-4911-1 Ubuntu Linux URL Logo usn.ubuntu.com/4911-1
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