CVE-2020-29569
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
An issue was discovered in the Linux kernel through 5.10.1, as used with Xen through 4.14.x. The Linux kernel PV block backend expects the kernel thread handler to reset ring->xenblkd to NULL when stopped. However, the handler may not have time to run if the frontend quickly toggles between the states connect and disconnect. As a consequence, the block backend may re-use a pointer after it was freed. A misbehaving guest can trigger a dom0 crash by continuously connecting / disconnecting a block frontend. Privilege escalation and information leaks cannot be ruled out. This only affects systems with a Linux blkback.
Se detectó un problema en el kernel de Linux versiones hasta 5.10.1, tal como es usado con Xen hasta 4.14.x. El backend del bloque PV del kernel de Linux espera que el controlador de subprocesos del kernel restablezca ring-)xenblkd a NULL cuando se detenga. Sin embargo, es posible que el controlador no tenga tiempo de ejecutarse si la interfaz alterna rápidamente entre los estados de conexión y desconexión. Como consecuencia, el backend del bloque puede reutiliza un puntero una vez liberado. Un invitado con mal comportamiento puede desencadenar un bloqueo de dom0 al conectar y desconectar continuamente una interfaz de bloque. No se puede descartar la escalada de privilegios y las fugas de información. Esto solo afecta a los Sistemas con un blkback de Linux
CVSS Scores
SSVC
- Decision:-
Timeline
- 2020-12-04 CVE Reserved
- 2020-12-15 CVE Published
- 2023-03-08 EPSS Updated
- 2024-08-04 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-416: Use After Free
CAPEC
References (6)
| URL | Tag | Source |
|---|---|---|
| https://lists.debian.org/debian-lts-announce/2021/02/msg00018.html | Mailing List |
|
| https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html | Mailing List |
|
| https://security.netapp.com/advisory/ntap-20210205-0001 | Third Party Advisory |
|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://xenbits.xenproject.org/xsa/advisory-350.html | 2023-01-19 |
| URL | Date | SRC |
|---|---|---|
| https://security.gentoo.org/glsa/202107-30 | 2023-01-19 | |
| https://www.debian.org/security/2021/dsa-4843 | 2023-01-19 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Netapp Search vendor "Netapp" | Hci Compute Node Bios Search vendor "Netapp" for product "Hci Compute Node Bios" | - | - |
Affected
| in | Netapp Search vendor "Netapp" | Hci Compute Node Search vendor "Netapp" for product "Hci Compute Node" | - | - |
Safe
|
| Xen Search vendor "Xen" | Xen Search vendor "Xen" for product "Xen" | <= 4.14.1 Search vendor "Xen" for product "Xen" and version " <= 4.14.1" | - |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.1.44 < 4.2 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.1.44 < 4.2" | - |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.4.80 < 4.4.254 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.4.80 < 4.4.254" | - |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.9.36 < 4.9.249 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.9.36 < 4.9.249" | - |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.11.9 < 4.12 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.11.9 < 4.12" | - |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.12 < 4.14.213 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.12 < 4.14.213" | - |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.15 < 4.19.164 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.15 < 4.19.164" | - |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.20 < 5.4.86 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.20 < 5.4.86" | - |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.5 < 5.10.4 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.5 < 5.10.4" | - |
Affected
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| Netapp Search vendor "Netapp" | Solidfire \& Hci Management Node Search vendor "Netapp" for product "Solidfire \& Hci Management Node" | - | - |
Affected
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| Netapp Search vendor "Netapp" | Solidfire \& Hci Storage Node Search vendor "Netapp" for product "Solidfire \& Hci Storage Node" | - | - |
Affected
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| Debian Search vendor "Debian" | Debian Linux Search vendor "Debian" for product "Debian Linux" | 9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0" | - |
Affected
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| Debian Search vendor "Debian" | Debian Linux Search vendor "Debian" for product "Debian Linux" | 10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0" | - |
Affected
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