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redhatcveRedhat.comRH:CVE-2021-47475
HistoryMay 23, 2024 - 11:06 a.m.

CVE-2021-47475

2024-05-2311:06:46
redhat.com
access.redhat.com
1
linux kernel
comedi
vmk80xx driver
vulnerability
buffer overflows
usb
transfer buffers
wmaxpacketsize
mitigation

6.5 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

13.0%

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.

6.5 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

13.0%