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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.13%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.13% probability · 3th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/1a160076d3d0dcd4a98a4599ad96eec0790b099bPatch
- https://git.kernel.org/stable/c/1f0bdc2884b67de337215079bba166df0cdf4ac5Patch
- https://git.kernel.org/stable/c/86c9ee928c4a370e323e432aaf8dca79c4ba7c85Patch
- https://git.kernel.org/stable/c/99381e762273a2410a3f0216000be32b013c0ea9Patch
- https://git.kernel.org/stable/c/c32df11147822d22facee8fa30c2e8971d12f426Patch
- https://git.kernel.org/stable/c/dbb500bad02146b388041877574829016591ddc8Patch
- https://git.kernel.org/stable/c/f1adeb1ff8bef1467d6961059810795d02bbad5dPatch
- https://git.kernel.org/stable/c/f5c772b76bbd95de8be51cf849c6098f6af6fcf9Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.