CVE-2021-47475
comedi: vmk80xx: fix transfer-buffer overflows
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
In the Linux kernel, the following vulnerability has been resolved:
comedi: vmk80xx: fix transfer-buffer overflows
The driver uses endpoint-sized USB transfer buffers but up until
recently had no sanity checks on the sizes.
Commit e1f13c879a7c ("staging: comedi: check validity of wMaxPacketSize
of usb endpoints found") inadvertently fixed NULL-pointer dereferences
when accessing the transfer buffers in case a malicious device has a
zero wMaxPacketSize.
Make sure to allocate buffers large enough to handle also the other
accesses that are done without a size check (e.g. byte 18 in
vmk80xx_cnt_insn_read() for the VMK8061_MODEL) to avoid writing beyond
the buffers, for example, when doing descriptor fuzzing.
The original driver was for a low-speed device with 8-byte buffers.
Support was later added for a device that uses bulk transfers and is
presumably a full-speed device with a maximum 64-byte wMaxPacketSize.
En el kernel de Linux, se resolvió la siguiente vulnerabilidad: comedi: vmk80xx: corrige desbordamientos del búfer de transferencia El controlador utiliza búferes de transferencia USB del tamaño de un terminal, pero hasta hace poco no tenía controles de cordura sobre los tamaños. el commit e1f13c879a7c ("staging: comedi: verificar la validez de wMaxPacketSize de los endpoints USB encontrados") corrigió inadvertidamente las desreferencias de puntero NULL al acceder a los buffers de transferencia en caso de que un dispositivo malicioso tenga un wMaxPacketSize cero. Asegúrese de asignar buffers lo suficientemente grandes para manejar también los otros accesos que se realizan sin una verificación de tamaño (por ejemplo, el byte 18 en vmk80xx_cnt_insn_read() para VMK8061_MODEL) para evitar escribir más allá de los buffers, por ejemplo, cuando se realiza una confusión de descriptores. El controlador original era para un dispositivo de baja velocidad con buffers de 8 bytes. Posteriormente se agregó soporte para un dispositivo que utiliza transferencias masivas y presumiblemente es un dispositivo de velocidad completa con un wMaxPacketSize máximo de 64 bytes.
CVSS Scores
SSVC
- Decision:Track
Timeline
- 2024-05-22 CVE Reserved
- 2024-05-22 CVE Published
- 2024-05-23 EPSS Updated
- 2024-11-04 CVE Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
CAPEC
References (10)
| URL | Tag | Source |
|---|---|---|
| https://git.kernel.org/stable/c/985cafccbf9b7f862aa1c5ee566801e18b5161fb | 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" | >= 2.6.31 < 4.4.292 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.31 < 4.4.292" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 2.6.31 < 4.9.290 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.31 < 4.9.290" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 2.6.31 < 4.14.255 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.31 < 4.14.255" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 2.6.31 < 4.19.217 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.31 < 4.19.217" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 2.6.31 < 5.4.159 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.31 < 5.4.159" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 2.6.31 < 5.10.79 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.31 < 5.10.79" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 2.6.31 < 5.14.18 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.31 < 5.14.18" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 2.6.31 < 5.15.2 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.31 < 5.15.2" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 2.6.31 < 5.16 Search vendor "Linux" for product "Linux Kernel" and version " >= 2.6.31 < 5.16" | en |
Affected
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