High [CVE-2026-89622] Linux kernel: Use-after-free in HID mcp2221 driver can lead to arbitrary code execution
This high-severity Red Hat Linux advisory covers CVE-2026-89622 affecting Red Hat OpenShift Container Platform 4.
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Summary
A flaw was found in the Linux kernel's HID (Human Interface Device) subsystem, specifically in the mcp2221 driver. This vulnerability occurs because the driver fails to clear a buffer pointer after an I2C/SMBus transfer completes.
A local attacker could exploit this by triggering a delayed or unexpected report, leading to a use-after-free condition. This could result in arbitrary code execution or a denial of service.
Red Hat severity: Important — CVSS 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-825.
Affected Red Hat products: Red Hat OpenShift Container Platform 4. Red Hat does not currently list a fixing RHSA for this CVE.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
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