CVE-2026-64329 - Vulnerability Details

- usb: typec: ucsi: ccg: Fix use-after-free of ucsi on remove

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.

Published: 2026-07-25

Score: n/a

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

No analysis available yet.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2`	affected	< f1adeb1ff8bef1467d6961059810795d02bbad5d
`e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2`	affected	< 99381e762273a2410a3f0216000be32b013c0ea9
`e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2`	affected	< 1a160076d3d0dcd4a98a4599ad96eec0790b099b
`e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2`	affected	< c32df11147822d22facee8fa30c2e8971d12f426
`e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2`	affected	< 86c9ee928c4a370e323e432aaf8dca79c4ba7c85
`e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2`	affected	< f5c772b76bbd95de8be51cf849c6098f6af6fcf9
`e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2`	affected	< dbb500bad02146b388041877574829016591ddc8
`e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2`	affected	< 1f0bdc2884b67de337215079bba166df0cdf4ac5

Linux

affected

Version	Status	Constraints
`5.5`	affected	—
`0`	unaffected	< 5.5
`5.10.261`	unaffected	≤ 5.10.*
`5.15.212`	unaffected	≤ 5.15.*
`6.1.178`	unaffected	≤ 6.1.*
`6.6.145`	unaffected	≤ 6.6.*
`6.12.96`	unaffected	≤ 6.12.*
`6.18.39`	unaffected	≤ 6.18.*
`7.1.4`	unaffected	≤ 7.1.*
`7.2-rc3`	unaffected	≤ *

No data.

Vendor Product Confidence Versions

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`[e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2,f1adeb1ff8bef1467d6961059810795d02bbad5d)`	affected	code_commit	—
`[e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2,99381e762273a2410a3f0216000be32b013c0ea9)`	affected	code_commit	—
`[e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2,1a160076d3d0dcd4a98a4599ad96eec0790b099b)`	affected	code_commit	—
`[e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2,c32df11147822d22facee8fa30c2e8971d12f426)`	affected	code_commit	—
`[e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2,86c9ee928c4a370e323e432aaf8dca79c4ba7c85)`	affected	code_commit	—
`[e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2,f5c772b76bbd95de8be51cf849c6098f6af6fcf9)`	affected	code_commit	—
`[e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2,dbb500bad02146b388041877574829016591ddc8)`	affected	code_commit	—
`[e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2,1f0bdc2884b67de337215079bba166df0cdf4ac5)`	affected	code_commit	—

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`5.5`	affected	generic	—
`[0,5.5)`	unaffected	generic	—
`[5.10.261,*]`	unaffected	generic	—
`[5.15.212,*]`	unaffected	generic	—
`[6.1.178,*]`	unaffected	generic	—
`[6.6.145,*]`	unaffected	generic	—
`[6.12.96,*]`	unaffected	generic	—
`[6.18.39,*]`	unaffected	generic	—
`[7.1.4,*]`	unaffected	generic	—
`[7.2-rc3,*]`	unaffected	generic	—

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Remediation

No remediation available yet.

Tracking

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Advisories

No advisories yet.

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.0022.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/1a160076d3d0dcd4a98a4599ad96eec0790b099b
https://git.kernel.org/stable/c/1f0bdc2884b67de337215079bba166df0cdf4ac5
https://git.kernel.org/stable/c/86c9ee928c4a370e323e432aaf8dca79c4ba7c85
https://git.kernel.org/stable/c/99381e762273a2410a3f0216000be32b013c0ea9
https://git.kernel.org/stable/c/c32df11147822d22facee8fa30c2e8971d12f426
https://git.kernel.org/stable/c/dbb500bad02146b388041877574829016591ddc8
https://git.kernel.org/stable/c/f1adeb1ff8bef1467d6961059810795d02bbad5d
https://git.kernel.org/stable/c/f5c772b76bbd95de8be51cf849c6098f6af6fcf9

History

Sat, 25 Jul 2026 09:30:00 +0000

Type	Values Removed	Values Added
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.
Title		usb: typec: ucsi: ccg: Fix use-after-free of ucsi on remove
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/1a160076d3d0dcd4a98a4599ad96eec0790b099b https://git.kernel.org/stable/c/1f0bdc2884b67de337215079bba166df0cdf4ac5 https://git.kernel.org/stable/c/86c9ee928c4a370e323e432aaf8dca79c4ba7c85 https://git.kernel.org/stable/c/99381e762273a2410a3f0216000be32b013c0ea9 https://git.kernel.org/stable/c/c32df11147822d22facee8fa30c2e8971d12f426 https://git.kernel.org/stable/c/dbb500bad02146b388041877574829016591ddc8 https://git.kernel.org/stable/c/f1adeb1ff8bef1467d6961059810795d02bbad5d https://git.kernel.org/stable/c/f5c772b76bbd95de8be51cf849c6098f6af6fcf9

Subscriptions

Linux Linux Kernel

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-07-25T08:49:57.098Z

Updated: 2026-07-25T08:49:57.098Z

Reserved: 2026-07-19T15:36:31.780Z

Link: CVE-2026-64329

Vulnrichment

No data.

NVD

No data.

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-07-25T13:15:03Z

Weaknesses

No weakness.

Tracking

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