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CVE-2021-28715

Public on 2022-01-06
Modified on 2022-02-04
Description

Incoming data packets for a guest in the Linux kernel's 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: There is a timeout how long the client side of an interface can stop consuming new packets before it is assumed to have stalled, but this timeout is rather long (60 seconds by default). Using a UDP connection on a fast interface can easily accumulate gigabytes of data in that time.

Severity
Medium
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CVSS v3 Base Score
5.0
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Affected Packages

Platform Package Release Date Advisory
Amazon Linux 1 kernel 2023-02-17 00:02 ALAS-2023-1688
Amazon Linux 1 kernel 2022-02-04 23:24 ALAS-2022-1563
Amazon Linux 2 - Core kernel 2022-02-04 23:25 ALAS2-2022-1749
Amazon Linux 2 - Kernel-5.10 Extra kernel 2022-01-26 00:57 ALAS2KERNEL-5.10-2022-009
Amazon Linux 2 - Kernel-5.4 Extra kernel 2022-01-26 00:54 ALAS2KERNEL-5.4-2022-021

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 5.0 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L
NVD CVSSv3 6.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
NVD CVSSv2 2.1 AV:L/AC:L/Au:N/C:N/I:N/A:P