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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
e32fd989ac1c45f993fbe89ad0a89aa9ea6993d2 to < f1adeb1ff8bef1467d6961059810795d02bbad5daffectede32fd989ac1c45f993fbe89ad0a89aa9ea6993d2 to < 99381e762273a2410a3f0216000be32b013c0ea9affectede32fd989ac1c45f993fbe89ad0a89aa9ea6993d2 to < 1a160076d3d0dcd4a98a4599ad96eec0790b099baffectede32fd989ac1c45f993fbe89ad0a89aa9ea6993d2 to < c32df11147822d22facee8fa30c2e8971d12f426affectede32fd989ac1c45f993fbe89ad0a89aa9ea6993d2 to < 86c9ee928c4a370e323e432aaf8dca79c4ba7c85affectede32fd989ac1c45f993fbe89ad0a89aa9ea6993d2 to < f5c772b76bbd95de8be51cf849c6098f6af6fcf9affectede32fd989ac1c45f993fbe89ad0a89aa9ea6993d2 to < dbb500bad02146b388041877574829016591ddc8affectede32fd989ac1c45f993fbe89ad0a89aa9ea6993d2 to < 1f0bdc2884b67de337215079bba166df0cdf4ac5affected
Linux Linux
Default version status: affected
5.5affected0 to < 5.5unaffected5.10.261 to ≤ 5.10.*unaffected5.15.212 to ≤ 5.15.*unaffected6.1.178 to ≤ 6.1.*unaffected6.6.145 to ≤ 6.6.*unaffected6.12.96 to ≤ 6.12.*unaffected6.18.39 to ≤ 6.18.*unaffected7.1.4 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/f1adeb1ff8bef1467d6961059810795d02bbad5d ↗
- https://git.kernel.org/stable/c/99381e762273a2410a3f0216000be32b013c0ea9 ↗
- https://git.kernel.org/stable/c/1a160076d3d0dcd4a98a4599ad96eec0790b099b ↗
- https://git.kernel.org/stable/c/c32df11147822d22facee8fa30c2e8971d12f426 ↗
- https://git.kernel.org/stable/c/86c9ee928c4a370e323e432aaf8dca79c4ba7c85 ↗
- https://git.kernel.org/stable/c/f5c772b76bbd95de8be51cf849c6098f6af6fcf9 ↗
- https://git.kernel.org/stable/c/dbb500bad02146b388041877574829016591ddc8 ↗
- https://git.kernel.org/stable/c/1f0bdc2884b67de337215079bba166df0cdf4ac5 ↗