Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 67a95c21463d066060b0f66d65a75d45bb386ffb before bd146a8ff107c6d77e75597decbcd1df0d7900d6; affected 67a95c21463d066060b0f66d65a75d45bb386ffb before d6c6b293173c0ea87189501cbd77e8fa677814a1; affected 67a95c21463d066060b0f66d65a75d45bb386ffb before 03c34309eb1bce1b3b5f7c4a94b703f419120383; affected 67a95c21463d066060b0f66d65a75d45bb386ffb before 968546b676d992dd1da3e057d40598231f725996; affected 67a95c21463d066060b0f66d65a75d45bb386ffb before db2333f88729c8aae062cb171ed058725ff5c901 |
| Linux / Linux | affected 5.7; unaffected 0 before 5.7; unaffected 6.6.160 through 6.6.*; unaffected 6.12.111 through 6.12.*; unaffected 6.18.51 through 6.18.*; unaffected 7.2.4 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
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