CVSS: 6.5EPSS: 0%CPEs: 4EXPL: 0CVE-2021-28713
https://notcve.org/view.php?id=CVE-2021-28713
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 Los backends fraudulentos pueden causar DoS de huéspedes por medio de eventos de alta frecuencia T[este registro de información CNA se relaciona con múltiples CVEs; el texto explica qué aspectos/vulnerabilidades corresponden a cada CVE]. • https://lists.debian.org/debian-lts-announce/2022/03/msg00011.html https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html https://www.debian.org/security/2022/dsa-5050 https://www.debian.org/security/2022/dsa-5096 https://xenbits.xenproject.org/xsa/advisory-391.txt •
CVSS: 6.5EPSS: 0%CPEs: 4EXPL: 0CVE-2021-28712
https://notcve.org/view.php?id=CVE-2021-28712
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 Los backends fraudulentos pueden causar DoS de los huéspedes por medio de eventos de alta frecuencia T[este registro de información CNA se relaciona con múltiples CVEs; el texto explica qué aspectos/vulnerabilidades corresponden a cada CVE]. • https://lists.debian.org/debian-lts-announce/2022/03/msg00011.html https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html https://www.debian.org/security/2022/dsa-5050 https://www.debian.org/security/2022/dsa-5096 https://xenbits.xenproject.org/xsa/advisory-391.txt •
CVSS: 6.5EPSS: 0%CPEs: 4EXPL: 0CVE-2021-28711
https://notcve.org/view.php?id=CVE-2021-28711
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 Los backends fraudulentos pueden causar DoS de los huéspedes por medio de eventos de alta frecuencia T[este registro de información CNA es relacionado con múltiples CVEs; el texto explica qué aspectos/vulnerabilidades corresponden a cada CVE]. • https://lists.debian.org/debian-lts-announce/2022/03/msg00011.html https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html https://www.debian.org/security/2022/dsa-5050 https://www.debian.org/security/2022/dsa-5096 https://xenbits.xenproject.org/xsa/advisory-391.txt •
CVSS: 7.0EPSS: 0%CPEs: 1EXPL: 0CVE-2021-28703
https://notcve.org/view.php?id=CVE-2021-28703
grant table v2 status pages may remain accessible after de-allocation (take two) Guest get permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, get de-allocated when a guest switched (back) from v2 to v1. The freeing of such pages requires that the hypervisor know where in the guest these pages were mapped. The hypervisor tracks only one use within guest space, but racing requests from the guest to insert mappings of these pages may result in any of them to become mapped in multiple locations. • https://security.gentoo.org/glsa/202402-07 https://xenbits.xenproject.org/xsa/advisory-387.txt •
CVSS: 8.6EPSS: 0%CPEs: 4EXPL: 0CVE-2021-28706
https://notcve.org/view.php?id=CVE-2021-28706
guests may exceed their designated memory limit When a guest is permitted to have close to 16TiB of memory, it may be able to issue hypercalls to increase its memory allocation beyond the administrator established limit. This is a result of a calculation done with 32-bit precision, which may overflow. It would then only be the overflowed (and hence small) number which gets compared against the established upper bound. Los huéspedes pueden exceder su límite de memoria designado Cuando a un huésped se le permite tener cerca de 16TiB de memoria, puede ser capaz de emitir hypercalls para aumentar su asignación de memoria más allá del límite establecido por el administrador. Esto es el resultado de un cálculo realizado con precisión de 32 bits, que puede desbordarse. • https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/I7ZGWVVRI4XY2XSTBI3XEMWBXPDVX6OT https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PXUI4VMD52CH3T7YXAG3J2JW7ZNN3SXF https://security.gentoo.org/glsa/202402-07 https://www.debian.org/security/2021/dsa-5017 https://xenbits.xenproject.org/xsa/advisory-385.txt • CWE-770: Allocation of Resources Without Limits or Throttling •