CVE-2026-89622

CVE CVE-2026-89622EUVD EUVD-2026-76534Published 2026-09-11T19:45:20.000ZLast changed 2026-09-13T06:32:02.000ZCVSS 7.8

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 0; patch: 7.2.4; patch: 6.18.51; 67a95c21463d066060b0f66d65a75d45bb386ffb <968546b676d992dd1da3e057d40598231f725996; 67a95c21463d066060b0f66d65a75d45bb386ffb <db2333f88729c8aae062cb171ed058725ff5c901; 67a95c21463d066060b0f66d65a75d45bb386ffb <03c34309eb1bce1b3b5f7c4a94b703f419120383; 5.7; patch: 7.3-rc1

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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