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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-89622

HID: mcp2221: clear rxbuf after I2C/SMBus transfer completes

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 67a95c21463d066060b0f66d65a75d45bb386ffb to < bd146a8ff107c6d77e75597decbcd1df0d7900d6affected
  • 67a95c21463d066060b0f66d65a75d45bb386ffb to < d6c6b293173c0ea87189501cbd77e8fa677814a1affected
  • 67a95c21463d066060b0f66d65a75d45bb386ffb to < 03c34309eb1bce1b3b5f7c4a94b703f419120383affected
  • 67a95c21463d066060b0f66d65a75d45bb386ffb to < 968546b676d992dd1da3e057d40598231f725996affected
  • 67a95c21463d066060b0f66d65a75d45bb386ffb to < db2333f88729c8aae062cb171ed058725ff5c901affected

Linux Linux

Default version status: affected

  • 5.7affected
  • 0 to < 5.7unaffected
  • 6.6.160 to ≤ 6.6.*unaffected
  • 6.12.111 to ≤ 6.12.*unaffected
  • 6.18.51 to ≤ 6.18.*unaffected
  • 7.2.4 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References