HID: mcp2221: clear rxbuf after I2C/SMBus transfer completes
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.6.160, 6.12.111, 6.18.51, 7.2.4
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
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.
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
From 67a95c21463d066060b0f66d65a75d45bb386ffb · fixed in bd146a8ff107c6d77e75597decbcd1df0d7900d6; From 67a95c21463d066060b0f66d65a75d45bb386ffb · fixed in d6c6b293173c0ea87189501cbd77e8fa677814a1; From 67a95c21463d066060b0f66d65a75d45bb386ffb · fixed in 03c34309eb1bce1b3b5f7c4a94b703f419120383; From 67a95c21463d066060b0f66d65a75d45bb386ffb · fixed in 968546b676d992dd1da3e057d40598231f725996; From 67a95c21463d066060b0f66d65a75d45bb386ffb · fixed in db2333f88729c8aae062cb171ed058725ff5c901
- Linux Linux
5.7
- KernelLinux
From 5.7.0 · fixed in 6.6.160; From 6.7.0 · fixed in 6.12.111; From 6.13.0 · fixed in 6.18.51; From 6.19.0 · fixed in 7.2.4