HID: mcp2221: validate report size in mcp2221_raw_event()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89621
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:47 UTC
Updated2026-09-11 20:19:47 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: HID: mcp2221: validate report size in mcp2221_raw_event() mcp2221_raw_event() never validates the size of incoming HID reports. In the MCP2221_I2C_GET_DATA path it trusts the device-supplied data[3] as the copy length without checking that 4 + data[3] bytes actually exist in the received report. A malicious or misbehaving USB device can send a short report with a large data[3], causing the memcpy to read past the valid report data in the HID transfer buffer and leak uninitialized kernel memory back to userspace through the I2C/SMBus read path. Add a minimum size check at entry and validate that the source range fits within the received report before the copy.

Risk And Classification

EPSS: 0.002090000 probability, percentile 0.111270000 (date 2026-09-13)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 67a95c21463d066060b0f66d65a75d45bb386ffb bdc6a3af0dd734a326acdb7d6401a3b6a9f4f149 git Not specified
CNA Linux Linux affected 67a95c21463d066060b0f66d65a75d45bb386ffb 127de5919820f88a9d55e8371ad4ac49f625f4c5 git Not specified
CNA Linux Linux affected 67a95c21463d066060b0f66d65a75d45bb386ffb 7c18fb36708a97ff6772825cc087b6d537bbf0d5 git Not specified
CNA Linux Linux affected 67a95c21463d066060b0f66d65a75d45bb386ffb 2c9a6998c19503626c57a2267bf279e204113079 git Not specified
CNA Linux Linux affected 5.7 Not specified
CNA Linux Linux unaffected 5.7 semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2c9a6998c19503626c57a2267bf279e204113079 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bdc6a3af0dd734a326acdb7d6401a3b6a9f4f149 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7c18fb36708a97ff6772825cc087b6d537bbf0d5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/127de5919820f88a9d55e8371ad4ac49f625f4c5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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