CVE - CVE-2021-47475

CVE-ID
CVE-2021-47475	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/06ac746d57e6d32b062e220415c607b7e2e0fa50 URL:https://git.kernel.org/stable/c/06ac746d57e6d32b062e220415c607b7e2e0fa50 MISC:https://git.kernel.org/stable/c/199acd8c110e3ae62833c24f632b0bb1c9f012a9 URL:https://git.kernel.org/stable/c/199acd8c110e3ae62833c24f632b0bb1c9f012a9 MISC:https://git.kernel.org/stable/c/278484ae93297b1bb1ce755f9d3b6d95a48c7d47 URL:https://git.kernel.org/stable/c/278484ae93297b1bb1ce755f9d3b6d95a48c7d47 MISC:https://git.kernel.org/stable/c/33d7a470730dfe7c9bfc8da84575cf2cedd60d00 URL:https://git.kernel.org/stable/c/33d7a470730dfe7c9bfc8da84575cf2cedd60d00 MISC:https://git.kernel.org/stable/c/40d2a7e278e2e7c0a5fd7e997e7eb63945bf93f7 URL:https://git.kernel.org/stable/c/40d2a7e278e2e7c0a5fd7e997e7eb63945bf93f7 MISC:https://git.kernel.org/stable/c/5229159f1d052821007aff1a1beb7873eacf1a9f URL:https://git.kernel.org/stable/c/5229159f1d052821007aff1a1beb7873eacf1a9f MISC:https://git.kernel.org/stable/c/7a2021b896de1ad559d33b5c5cdd20b982242088 URL:https://git.kernel.org/stable/c/7a2021b896de1ad559d33b5c5cdd20b982242088 MISC:https://git.kernel.org/stable/c/a23461c47482fc232ffc9b819539d1f837adf2b1 URL:https://git.kernel.org/stable/c/a23461c47482fc232ffc9b819539d1f837adf2b1 MISC:https://git.kernel.org/stable/c/ec85bcff4ed09260243d8f39faba99e1041718ba URL:https://git.kernel.org/stable/c/ec85bcff4ed09260243d8f39faba99e1041718ba
Assigning CNA
kernel.org
Date Record Created
20240522	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240522)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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