CVE-2026-89621
In the Linux kernel, the following vulnerability has been resolved: HID: mcp2221: validate report size in mcp2221_raw_event() mcp2221_raw_event() never validat…
Impact
In 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.
Affected packages
This record carries no package version data, so it cannot be matched against a dependency list automatically. Read the advisory and compare your version by hand.
References
- NVD record
- CVE.org record
- https://git.kernel.org/stable/c/127de5919820f88a9d55e8371ad4ac49f625f4c5
- https://git.kernel.org/stable/c/2c9a6998c19503626c57a2267bf279e204113079
- https://git.kernel.org/stable/c/7c18fb36708a97ff6772825cc087b6d537bbf0d5
- https://git.kernel.org/stable/c/b2c67dc0e30c308647bbd9b9e5d69a44c9d2733d
- https://git.kernel.org/stable/c/bdc6a3af0dd734a326acdb7d6401a3b6a9f4f149
- https://git.kernel.org/stable/c/c1c508e8923911cb458234997e55b7a4b9aa066f
- https://git.kernel.org/stable/c/cb38b1f149b7143355b37e86c841acf0076e5c2a
- https://git.kernel.org/stable/c/fffcfa367072628c3144cca17d2a3c3c9e50c057