CVE-2021-47060
KVM: Stop looking for coalesced MMIO zones if the bus is destroyed
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
In the Linux kernel, the following vulnerability has been resolved:
KVM: Stop looking for coalesced MMIO zones if the bus is destroyed
Abort the walk of coalesced MMIO zones if kvm_io_bus_unregister_dev()
fails to allocate memory for the new instance of the bus. If it can't
instantiate a new bus, unregister_dev() destroys all devices _except_ the
target device. But, it doesn't tell the caller that it obliterated the
bus and invoked the destructor for all devices that were on the bus. In
the coalesced MMIO case, this can result in a deleted list entry
dereference due to attempting to continue iterating on coalesced_zones
after future entries (in the walk) have been deleted.
Opportunistically add curly braces to the for-loop, which encompasses
many lines but sneaks by without braces due to the guts being a single
if statement.
En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: KVM: deja de buscar zonas MMIO fusionadas si el bus se destruye. Cancela el recorrido de las zonas MMIO fusionadas si kvm_io_bus_unregister_dev() no puede asignar memoria para la nueva instancia del bus. Si no puede crear una instancia de un nuevo bus, unregister_dev() destruye todos los dispositivos _excepto_ el dispositivo de destino. Pero no le dice a la persona que llama que destruyó el bus e invocó el destructor para todos los dispositivos que estaban en el bus. En el caso de MMIO fusionado, esto puede resultar en una desreferencia de entrada de lista eliminada debido al intento de continuar iterando en coalesced_zones después de que se hayan eliminado entradas futuras (en el recorrido). De manera oportunista, agregue llaves al bucle for, que abarca muchas líneas pero se escapa sin llaves debido a que el valor es una sola declaración if.
CVSS Scores
SSVC
- Decision:Track
Timeline
- 2024-02-29 CVE Reserved
- 2024-02-29 CVE Published
- 2024-03-01 EPSS Updated
- 2024-12-19 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
CAPEC
References (12)
| URL | Tag | Source |
|---|---|---|
| https://git.kernel.org/stable/c/41b2ea7a6a11e2b1a7f2c29e1675a709a6b2b98d | Vuln. Introduced | |
| https://git.kernel.org/stable/c/f65886606c2d3b562716de030706dfe1bea4ed5e | Vuln. Introduced | |
| https://git.kernel.org/stable/c/f0dfffce3f4ffd5f822568a4a6fb34c010e939d1 | Vuln. Introduced | |
| https://git.kernel.org/stable/c/840e124f89a5127e7eb97ebf377f4b8ca745c070 | Vuln. Introduced | |
| https://git.kernel.org/stable/c/40a023f681befd9b2862a3c16fb306a38b359ae5 | Vuln. Introduced | |
| https://git.kernel.org/stable/c/19184bd06f488af62924ff1747614a8cb284ad63 | Vuln. Introduced | |
| https://git.kernel.org/stable/c/68c125324b5e1d1d22805653735442923d896a1d | Vuln. Introduced |
| URL | Date | SRC |
|---|
| URL | Date | SRC |
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Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.4.66 < 5.4.119 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.4.66 < 5.4.119" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.9 < 5.10.37 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.9 < 5.10.37" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.9 < 5.11.21 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.9 < 5.11.21" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.9 < 5.12.4 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.9 < 5.12.4" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 5.9 < 5.13 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.9 < 5.13" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | 4.4.238 Search vendor "Linux" for product "Linux Kernel" and version "4.4.238" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | 4.9.238 Search vendor "Linux" for product "Linux Kernel" and version "4.9.238" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | 4.14.200 Search vendor "Linux" for product "Linux Kernel" and version "4.14.200" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | 4.19.148 Search vendor "Linux" for product "Linux Kernel" and version "4.19.148" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | 5.8.10 Search vendor "Linux" for product "Linux Kernel" and version "5.8.10" | en |
Affected
| ||||||