CVE-2026-89867

Summary

In the Linux kernel, the following vulnerability has been resolved:

media: chips-media: wave5: Defer job_finish() only when a DEC_PIC was queued

Decoder instances sharing a VPU also share one v4l2_m2m job slot, released when the running context calls v4l2_m2m_job_finish(). While draining, device_run() defers job_finish() once EOS is sent (sent_eos), expecting a later finish_decode() (from a DEC_PIC completion IRQ) to release the slot.

But the m2m core checks job_ready() only when a job is queued, not when it is dispatched. A job queued while draining can run after finish_decode() has already moved the instance to STOP and sent EOS. device_run() then runs in STOP, issues no DEC_PIC, yet still skips job_finish() - so no IRQ, no finish_decode(), and the shared slot is leaked, stalling every instance. With several v4l2h264dec instances in parallel, GStreamer hangs at EOS.

Track whether the run actually queued a DEC_PIC (cmd_issued) and defer job_finish() only then. Otherwise finish the job immediately

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/63d758d2f9dba836d5ae597d317cde522e817cf9
• https://git.kernel.org/stable/c/b694ba0a5526a69f78a6924982b1553154ccfd73

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