Use-after-free in Linux kernel - CVE-2026-89622
Published: September 12, 2026
Vulnerability identifier: #VU149184
CSH Severity: Low
CVSS v4: 1 [CVSS:4.0/AV:P/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89622
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an attacker with physical access to cause memory corruption.
The vulnerability exists due to a write use-after-free in the MCP2221 HID driver's mcp_i2c_smbus_read() and mcp2221_raw_event() functions when processing a delayed or spurious MCP2221_I2C_GET_DATA report after an I2C/SMBus transfer has ended. An attacker with physical access can trigger a report that writes device data to freed memory to cause memory corruption.
Affected software
Linux kernel
How to mitigate CVE-2026-89622
Install security update from vendor's repository.