The remote Ubuntu 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-5070-1 advisory.

    Maxim Levitsky and Paolo Bonzini discovered that the KVM hypervisor implementation for AMD processors in     the Linux kernel allowed a guest VM to disable restrictions on VMLOAD/VMSAVE in a nested guest. An     attacker in a guest VM could use this to read or write portions of the host's physical memory.
    (CVE-2021-3656)

    Maxim Levitsky discovered that the KVM hypervisor implementation for AMD processors in the Linux kernel     did not properly prevent a guest VM from enabling AVIC in nested guest VMs. An attacker in a guest VM     could use this to write to portions of the host's physical memory. (CVE-2021-3653)

    It was discovered that the Linux kernel did not properly enforce certain types of entries in the Secure     Boot Forbidden Signature Database (aka dbx) protection mechanism. An attacker could use this to bypass     UEFI Secure Boot restrictions. (CVE-2020-26541)

    It was discovered that the KVM hypervisor implementation in the Linux kernel did not properly perform     reference counting in some situations, leading to a use-after-free vulnerability. An attacker who could     start and control a VM could possibly use this to expose sensitive information or execute arbitrary code.
    (CVE-2021-22543)

    Norbert Slusarek discovered that the CAN broadcast manger (bcm) protocol implementation in the Linux     kernel did not properly initialize memory in some situations. A local attacker could use this to expose     sensitive information (kernel memory). (CVE-2021-34693)

    Murray McAllister discovered that the joystick device interface in the Linux kernel did not properly     validate data passed via an ioctl(). A local attacker could use this to cause a denial of service (system     crash) or possibly execute arbitrary code on systems with a joystick device registered. (CVE-2021-3612)

    It was discovered that the KVM hypervisor implementation in the Linux kernel did not properly compute the     access permissions for shadow pages in some situations. A local attacker could use this to cause a denial     of service. (CVE-2021-38198)

    It was discovered that the perf subsystem in the Linux kernel for the PowerPC architecture contained a     null pointer dereference in some situations. An attacker could use this to cause a denial of service     (system crash). (CVE-2021-38200)

    Ben Greear discovered that the mac80211 subsystem in the Linux kernel contained a null pointer dereference     in some situations. A physically proximate attacker could possibly use this to cause a denial of service     (system crash). (CVE-2021-38206)

    It was discovered that the Xilinx LL TEMAC device driver in the Linux kernel did not properly calculate     the number of buffers to be used in certain situations. A remote attacker could use this to cause a denial     of service (system crash). (CVE-2021-38207)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Detections

Analytics

Ubuntu 20.04 LTS : Linux kernel vulnerabilities (USN-5070-1)

high Nessus Plugin ID 153174

Version 1.7