Vulnerability 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)
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | < 5.15.0 |
| Debian | Debian Linux | 9.0 |
Related Weaknesses (CWE)
References
- https://lists.debian.org/debian-lts-announce/2022/03/msg00011.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/03/msg00012.htmlMailing ListThird Party Advisory
- https://www.debian.org/security/2022/dsa-5050Third Party Advisory
- https://www.debian.org/security/2022/dsa-5096Third Party Advisory
- https://xenbits.xenproject.org/xsa/advisory-392.txtVendor Advisory
- https://lists.debian.org/debian-lts-announce/2022/03/msg00011.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/03/msg00012.htmlMailing ListThird Party Advisory
- https://www.debian.org/security/2022/dsa-5050Third Party Advisory
- https://www.debian.org/security/2022/dsa-5096Third Party Advisory
- https://xenbits.xenproject.org/xsa/advisory-392.txtVendor Advisory
FAQ
What is CVE-2021-28715?
CVE-2021-28715 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 CV...
How severe is CVE-2021-28715?
CVE-2021-28715 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-28715?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, Debian Debian Linux.