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CVE-2021-28711

Status Candidate

Overview

Rogue backends can cause DoS of guests via high frequency events T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Xen offers the ability to run PV backends in regular unprivileged guests, typically referred to as "driver domains". Running PV backends in driver domains has one primary security advantage: if a driver domain gets compromised, it doesn't have the privileges to take over the system. However, a malicious driver domain could try to attack other guests via sending events at a high frequency leading to a Denial of Service in the guest due to trying to service interrupts for elongated amounts of time. There are three affected backends: * blkfront patch 1, CVE-2021-28711 * netfront patch 2, CVE-2021-28712 * hvc_xen (console) patch 3, CVE-2021-28713

Related Files

Ubuntu Security Notice USN-5377-1
Posted Apr 13, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5377-1 - It was discovered that the network traffic control implementation in the Linux kernel contained a use-after-free vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Yiqi Sun and Kevin Wang discovered that the cgroups implementation in the Linux kernel did not properly restrict access to the cgroups v1 release_agent feature. A local attacker could use this to gain administrative privileges.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2021-28711, CVE-2021-28715, CVE-2021-4135, CVE-2021-43976, CVE-2021-44733, CVE-2021-45095, CVE-2021-45469, CVE-2021-45480, CVE-2022-0435, CVE-2022-0492, CVE-2022-1055, CVE-2022-27666
SHA-256 | 7e8bb3e3236447d1446aec7cdf4a4e028e781bb1a791ee70ba7d1d4a0e3b9b7b
Ubuntu Security Notice USN-5368-1
Posted Apr 7, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5368-1 - It was discovered that the BPF verifier in the Linux kernel did not properly restrict pointer types in certain situations. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. It was discovered that the network traffic control implementation in the Linux kernel contained a use-after-free vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2021-28711, CVE-2021-28715, CVE-2021-39685, CVE-2021-39698, CVE-2021-4135, CVE-2021-4197, CVE-2021-43975, CVE-2021-44733, CVE-2021-45095, CVE-2021-45402, CVE-2021-45480, CVE-2022-0264, CVE-2022-0382, CVE-2022-0435, CVE-2022-0492, CVE-2022-0516, CVE-2022-0742, CVE-2022-1055, CVE-2022-23222, CVE-2022-27666
SHA-256 | 5d0b16263370f4a729db7ba7a5a7cdbc7ade51f3de840e5c97e95000dd201eb7
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-5338-1
Posted Mar 22, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5338-1 - Yiqi Sun and Kevin Wang discovered that the cgroups implementation in the Linux kernel did not properly restrict access to the cgroups v1 release_agent feature. A local attacker could use this to gain administrative privileges. J

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2021-28711, CVE-2021-28715, CVE-2021-4135, CVE-2021-43976, CVE-2021-44733, CVE-2021-45095, CVE-2021-45480, CVE-2022-0435, CVE-2022-0492, CVE-2022-0516
SHA-256 | 8237e5780ec9d5762a287998415d277ae8d9148196c501305fc7c81735e15f4e
Ubuntu Security Notice USN-5337-1
Posted Mar 22, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5337-1 - It was discovered that the BPF verifier in the Linux kernel did not properly restrict pointer types in certain situations. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Yiqi Sun and Kevin Wang discovered that the cgroups implementation in the Linux kernel did not properly restrict access to the cgroups v1 release_agent feature. A local attacker could use this to gain administrative privileges.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2021-28711, CVE-2021-28715, CVE-2021-39685, CVE-2021-39698, CVE-2021-4135, CVE-2021-4197, CVE-2021-43975, CVE-2021-44733, CVE-2021-45095, CVE-2021-45402, CVE-2021-45480, CVE-2022-0264, CVE-2022-0382, CVE-2022-0435, CVE-2022-0492, CVE-2022-0516, CVE-2022-0742, CVE-2022-23222
SHA-256 | 4dff7bdfe15d8b868bc4461cfd70105479202ceeccf3bca61cd797c093e0dd5a
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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