QID 353160

Date Published: 2022-02-11

QID 353160: Amazon Linux Security Advisory for kernel : ALAS2-2022-1749

a denial of service flaw for virtual machine guests in the linux kernels xen hypervisor subsystem was found in the way users call some interrupts with high frequency from one of the guests. a local user could use this flaw to starve the resources resulting in a denial of service. (
( CVE-2021-28711) a denial of service flaw for virtual machine guests in the linux kernels xen hypervisor subsystem was found in the way users call some interrupts with high frequency from one of the guests. a local user could use this flaw to starve the resources resulting in a denial of service. (
( CVE-2021-28712) a denial of service flaw for virtual machine guests in the linux kernels xen hypervisor subsystem was found in the way users call some interrupts with high frequency from one of the guests. a local user could use this flaw to starve the resources resulting in a denial of service. (
( CVE-2021-28713) incoming data packets for a guest in the linux kernels netback driver are buffered until the guest is ready to process them.
There are some measures taken for avoiding to pile up too much data, but those can be bypassed by the guest: the timeout could even never trigger if the guest manages to have only one free slot in its rx queue ring page and the next package would require more than one free slot, which may be the case when using gso, xdp, or software hashing. (
( CVE-2021-28714) incoming data packets for a guest in the linux kernels netback driver are buffered until the guest is ready to process them.
Using a udp connection on a fast interface can easily accumulate gigabytes of data in that time.

Successful exploitation of this vulnerability could lead to a securitybreach or could affect integrity, availability, and confidentiality.

  • CVSS V3 rated as High - 7 severity.
  • CVSS V2 rated as Medium - 4.4 severity.
    • Solution
    Please refer to Amazon advisory: ALAS2-2022-1749 for affected packages and patching details, or update with your package manager.
    Vendor References

    CVEs related to QID 353160

    CVE-2021-28713 | CVE-2021-28712 | CVE-2021-4083 | CVE-2021-28714 | CVE-2021-28715 | CVE-2021-28711 | CVE-2021-4155 | CVE-2021-44733 | CVE-2022-0492 |
    Software Advisories
    Advisory ID Software Component Link
    ALAS2-2022-1749 Amazon Linux 2 URL Logo alas.aws.amazon.com/AL2/ALAS-2022-1749.html
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