Published: 05/01/2022 Updated: 06/04/2022

CVSS v2 Base Score: 2.1 | Impact Score: 2.9 | Exploitability Score: 3.9

CVSS v3 Base Score: 6.5 | Impact Score: 4 | Exploitability Score: 2

VMScore: 187

Vector: AV:L/AC:L/Au:N/C:N/I:N/A:P

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

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Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks CVE-2021-4155 Kirill Tkhai discovered a data leak in the way the XFS_IOC_ALLOCSP IOCTL in the XFS filesystem allowed for a size increase of files with unaligned size A local attacker can tak ...

Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks CVE-2020-29374 Jann Horn of Google reported a flaw in Linux's virtual memory management A parent and child process initially share all their memory, but when either writes to a shared page, ...

Several security issues were fixed in the Linux kernel ...

A flaw in the processing of received ICMP errors (ICMP fragment needed and ICMP redirect) in the Linux kernel functionality was found to allow the ability to quickly scan open UDP ports This flaw allows an off-path remote user to effectively bypass the source port UDP randomization The highest threat from this vulnerability is to confidentiality ...

A denial of service flaw for virtual machine guests in the Linux kernel's Xen hypervisor subsystem was found in the way users call some interrupts with high frequency from one of the guestsA local user could use this flaw to starve the resources resulting in a denial of service (CVE-2021-28711) A denial of service flaw for virtual machine guests ...

NVD-CWE-noinfo https://xenbits.xenproject.org/xsa/advisory-391.txt https://www.debian.org/security/2022/dsa-5050 https://www.debian.org/security/2022/dsa-5096 https://lists.debian.org/debian-lts-announce/2022/03/msg00011.html https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html https://nvd.nist.gov https://www.debian.org/security/2022/dsa-5050 https://ubuntu.com/security/notices/USN-5298-1

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CVE-2021-28712

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