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CVE-2021-28714

Status Candidate

Overview

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)

Related Files

Debian Security Advisory 5096-1
Posted Mar 28, 2022
Authored by Debian | Site debian.org

Debian Linux Security Advisory 5096-1 - Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks.

tags | advisory, denial of service, kernel, vulnerability
systems | linux, debian
advisories | CVE-2020-29374, CVE-2020-36322, CVE-2021-20317, CVE-2021-20321, CVE-2021-20322, CVE-2021-22600, CVE-2021-28711, CVE-2021-28712, CVE-2021-28713, CVE-2021-28714, CVE-2021-28715, CVE-2021-28950, CVE-2021-3640, CVE-2021-3744
SHA-256 | 75c044bf4d2e418a7cc68e74ff3d6f180013990253cbe7731409a07b3b799fa7
Ubuntu Security Notice USN-5298-1
Posted Feb 22, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5298-1 - It was discovered that the Packet network protocol implementation in the Linux kernel contained a double-free vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. J

tags | advisory, denial of service, arbitrary, kernel, local, protocol
systems | linux, ubuntu
advisories | CVE-2021-22600, CVE-2021-28714, CVE-2021-39685, CVE-2021-4083, CVE-2021-4155, CVE-2021-4202, CVE-2022-0330, CVE-2022-22942
SHA-256 | 09c5b3fccd425392b5367e56e1a647931c3ab62c1011ad7cd2bfc5d674d117af
Debian Security Advisory 5050-1
Posted Jan 28, 2022
Authored by Debian | Site debian.org

Debian Linux Security Advisory 5050-1 - Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks.

tags | advisory, denial of service, kernel, vulnerability
systems | linux, debian
advisories | CVE-2021-28711, CVE-2021-28712, CVE-2021-28713, CVE-2021-28714, CVE-2021-28715, CVE-2021-39685, CVE-2021-4155, CVE-2021-45095, CVE-2021-45469, CVE-2021-45480, CVE-2022-0185, CVE-2022-23222
SHA-256 | 201719841d62e63a9df601bb25c6296f57bb40b4ff04b69e300f0b1ed9ce5c7a
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