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CVE-2026-89622

7.8 · HIGH

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…

Published Sep 11, 2026EPSS 0.16%

Overview

CVE-2026-89622 is a high-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/03c34309eb1bce1b3b5f7c4a94b703f419120383Refgit.kernel.org/stable/c/198bf4a226229e36dfe254493a45c71c3ffc7e57Refgit.kernel.org/stable/c/968546b676d992dd1da3e057d40598231f725996Refgit.kernel.org/stable/c/bd146a8ff107c6d77e75597decbcd1df0d7900d6Refgit.kernel.org/stable/c/d6c6b293173c0ea87189501cbd77e8fa677814a1Refgit.kernel.org/stable/c/db2333f88729c8aae062cb171ed058725ff5c901

How CyberStrike helps

Frequently asked questions

What is CVE-2026-89622?

CVE-2026-89622 is a high-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-89622?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-89622?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-89622?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-89622 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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