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NOTICE UPDATED - April, 25th 2024

NIST has updated the NVD program announcement page with additional information regarding recent concerns and the temporary delays in enrichment efforts.

CVE-2021-47475 Detail

Description

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.


Severity



CVSS 4.0 Severity and Metrics:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.


NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have not published a CVSS score for this CVE at this time. NVD Analysts use publicly available information at the time of analysis to associate CVSS vector strings.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://git.kernel.org/stable/c/06ac746d57e6d32b062e220415c607b7e2e0fa50
https://git.kernel.org/stable/c/199acd8c110e3ae62833c24f632b0bb1c9f012a9
https://git.kernel.org/stable/c/278484ae93297b1bb1ce755f9d3b6d95a48c7d47
https://git.kernel.org/stable/c/33d7a470730dfe7c9bfc8da84575cf2cedd60d00
https://git.kernel.org/stable/c/40d2a7e278e2e7c0a5fd7e997e7eb63945bf93f7
https://git.kernel.org/stable/c/5229159f1d052821007aff1a1beb7873eacf1a9f
https://git.kernel.org/stable/c/7a2021b896de1ad559d33b5c5cdd20b982242088
https://git.kernel.org/stable/c/a23461c47482fc232ffc9b819539d1f837adf2b1
https://git.kernel.org/stable/c/ec85bcff4ed09260243d8f39faba99e1041718ba

Weakness Enumeration

CWE-ID CWE Name Source

Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-47475
NVD Published Date:
05/22/2024
NVD Last Modified:
05/22/2024
Source:
kernel.org