CVE - CVE-2021-28714

CVE-ID
CVE-2021-28714	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
Guest can force Linux netback driver to hog large amounts of kernel memory T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] 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. (CVE-2021-28715) 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)
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
DEBIAN:DSA-5050 URL:https://www.debian.org/security/2022/dsa-5050 DEBIAN:DSA-5096 URL:https://www.debian.org/security/2022/dsa-5096 MISC:https://xenbits.xenproject.org/xsa/advisory-392.txt URL:https://xenbits.xenproject.org/xsa/advisory-392.txt MLIST:[debian-lts-announce] 20220309 [SECURITY] [DLA 2940-1] linux security update URL:https://lists.debian.org/debian-lts-announce/2022/03/msg00011.html MLIST:[debian-lts-announce] 20220309 [SECURITY] [DLA 2941-1] linux-4.19 security update URL:https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html
Assigning CNA
Xen Project
Date Record Created
20210318	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20210318)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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