CVE-2026-64329: In the Linux kernel, the following vulnerability has been resolved: usb: typec: ucsi: ccg: Fix use-after-free of ucsi on remove The threaded IRQ han...

Description

In the Linux kernel, the following vulnerability has been resolved: usb: typec: ucsi: ccg: Fix use-after-free of ucsi on remove The threaded IRQ handler ccg_irq_handler() calls ucsi_notify_common(), which on a connector-change event calls ucsi_connector_change() and schedules connector work. In ucsi_ccg_remove(), ucsi_destroy() frees uc->ucsi (kfree) before free_irq() is called, so a handler invocation already in flight may access the freed object after ucsi_destroy(). CPU 0 (remove) | CPU 1 (threaded IRQ) ucsi_destroy(uc->ucsi) | ccg_irq_handler() kfree(ucsi) // FREE | ucsi_notify_common(uc->ucsi) // USE Move free_irq() before ucsi_destroy() in the remove path. It is kept after ucsi_unregister(): ucsi_unregister() cancels connector work whose handler issues GET_CONNECTOR_STATUS through ucsi_send_command_common(), which waits for a completion that is signalled from the IRQ handler, so the IRQ must stay active until that work has been cancelled. The probe error path already orders free_irq() before ucsi_destroy(). This bug was found by static analysis.

Metrics

EPSS Probability

0.18%

7.4th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

Vendor	Product	Versions
Linux	Linux	>= e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2, < f1adeb1ff8bef1467d6961059810795d02bbad5d; >= e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2, < 99381e762273a2410a3f0216000be32b013c0ea9; >= e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2, < 1a160076d3d0dcd4a98a4599ad96eec0790b099b; >= e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2, < c32df11147822d22facee8fa30c2e8971d12f426; >= e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2, < 86c9ee928c4a370e323e432aaf8dca79c4ba7c85; >= e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2, < f5c772b76bbd95de8be51cf849c6098f6af6fcf9; >= e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2, < dbb500bad02146b388041877574829016591ddc8; >= e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2, < 1f0bdc2884b67de337215079bba166df0cdf4ac5
Linux	Linux	5.5

References

Timeline

Published: Jul 25, 2026
Last Modified: Aug 11, 2026
Status: Awaiting Analysis

Frequently Asked Questions

What is CVE-2026-64329?

In the Linux kernel, the following vulnerability has been resolved: usb: typec: ucsi: ccg: Fix use-after-free of ucsi on remove The threaded IRQ handler ccg_irq_handler() calls ucsi_notify_common(), which on a connector-change event calls ucsi_connector_change() and schedules connector work. In ucsi_ccg_remove(), ucsi_destroy() frees uc->ucsi (kfree) before free_irq() is called, so a handler invocation already in flight may access the freed object after ucsi_destroy(). CPU 0 (remove) | CPU 1 (threaded IRQ) ucsi_destroy(uc->ucsi) | ccg_irq_handler() kfree(ucsi) // FREE | ucsi_notify_common(uc->ucsi) // USE Move free_irq() before ucsi_destroy() in the remove path. It is kept after ucsi_unregister(): ucsi_unregister() cancels connector work whose handler issues GET_CONNECTOR_STATUS through ucsi_send_command_common(), which waits for a completion that is signalled from the IRQ handler, so the IRQ must stay active until that work has been cancelled. The probe error path already orders free_irq() before ucsi_destroy(). This bug was found by static analysis.

How severe is CVE-2026-64329?

Severity scoring for CVE-2026-64329 is pending analysis. The EPSS model estimates a 0.18% probability of exploitation in the next 30 days.

How do I fix CVE-2026-64329?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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