CVE-2026-89622HID: mcp2221: clear rxbuf after I2C/SMBus transfer completes
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- Sep 21, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 67a95c21463d066060b0f66d65a75d45bb386ffb before d6c6b293173c0ea87189501cbd77e8fa677814a1; 67a95c21463d066060b0f66d65a75d45bb386ffb builds before 03c34309eb1bce1b3b5f7c4a94b703f419120383; from 67a95c21463d066060b0f66d65a75d45bb386ffb before 968546b676d992dd1da3e057d40598231f725996; from 67a95c21463d066060b0f66d65a75d45bb386ffb before db2333f88729c8aae062cb171ed058725ff5c901 | CNA record |
References
- 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.