High 7.8Published Sep 11, 2026

CVE-2026-89622HID: mcp2221: clear rxbuf after I2C/SMBus transfer completes

Updated under an hour ago (Oct 26, 2026, 3:10 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: HID: mcp2221: clear rxbuf after I2C/SMBus transfer completes mcp_i2c_smbus_read() stores the caller-supplied buffer pointer in mcp->rxbuf for the duration of a transfer but never clears it when the transfer finishes or times out. Once the caller frees or reuses the buffer, mcp->rxbuf becomes a dangling pointer. A delayed or spurious MCP2221_I2C_GET_DATA report can then drive mcp2221_raw_event() to memcpy device data into the freed memory, causing a write use-after-free. Route all return paths through a single exit point that clears mcp->rxbuf and mcp->rxbuf_size, so that the existing !mcp->rxbuf guard in the raw_event handler can reject any report arriving after the transfer has ended.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 21, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 67a95c21463d066060b0f66d65a75d45bb386ffb before bd146a8ff107c6d77e75597decbcd1df0d7900d6; from 67a95c21463d066060b0f66d65a75d45bb386ffb before d6c6b293173c0ea87189501cbd77e8fa677814a1; 67a95c21463d066060b0f66d65a75d45bb386ffb builds before 03c34309eb1bce1b3b5f7c4a94b703f419120383; from 67a95c21463d066060b0f66d65a75d45bb386ffb before 968546b676d992dd1da3e057d40598231f725996; from 67a95c21463d066060b0f66d65a75d45bb386ffb before db2333f88729c8aae062cb171ed058725ff5c901	CNA record

References

References

https://git.kernel.org/stable/c/bd146a8ff107c6d77e75597decbcd1df0d7900d6
https://git.kernel.org/stable/c/d6c6b293173c0ea87189501cbd77e8fa677814a1
https://git.kernel.org/stable/c/03c34309eb1bce1b3b5f7c4a94b703f419120383
https://git.kernel.org/stable/c/968546b676d992dd1da3e057d40598231f725996
https://git.kernel.org/stable/c/db2333f88729c8aae062cb171ed058725ff5c901

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.