CVE-2026-43007accel/qaic: Handle DBC deactivation if the owner went away

Official description

In the Linux kernel, the following vulnerability has been resolved: accel/qaic: Handle DBC deactivation if the owner went away When a DBC is released, the device sends a QAIC_TRANS_DEACTIVATE_FROM_DEV transaction to the host over the QAIC_CONTROL MHI channel. QAIC handles this by calling decode_deactivate() to release the resources allocated for that DBC. Since that handling is done in the qaic_manage_ioctl() context, if the user goes away before receiving and handling the deactivation, the host will be out-of-sync with the DBCs available for use, and the DBC resources will not be freed unless the device is removed. If another user loads and requests to activate a network, then the device assigns the same DBC to that network, QAIC will "indefinitely" wait for dbc->in_use = false, leading the user process to hang. As a solution to this, handle QAIC_TRANS_DEACTIVATE_FROM_DEV transactions that are received after the user has gone away.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/2dd67966f39a2abf8ccb4865031c722e40e01b7f
• https://git.kernel.org/stable/c/08021f2d4a557d6491e3bcc288e96425f50aa3cf
• https://git.kernel.org/stable/c/f403094d9075d7c565a3d81002b781c325cb3c07
• https://git.kernel.org/stable/c/ee0180e77e6c8482644569632065411de844c515
• https://git.kernel.org/stable/c/2feec5ae5df785658924ab6bd91280dc3926507c