Description
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
Published: 2026-09-16
Score: n/a
EPSS: < 1% Very Low
KEV: No
Impact: Denial of Service
Action: Apply Patch
AI Analysis

Impact

A flaw in the Linux media subsystem causes a shared VPU job slot to be leaked when a decoder instance drains at end‑of‑stream. Because the job finishing routine is incorrectly deferred, video processing threads can stall indefinitely, resulting in a DoS that halts GStreamer pipelines and any code that uses the affected drivers. The weakness is a resource‑management defect that can prevent the system from releasing critical kernel resources.

Affected Systems

All Linux kernel builds that include the media:chips-media wave5 driver are affected; the vulnerability is present in kernel releases before the fix for CVE‑2026‑89867.

Risk and Exploitability

The CVSS score for this issue has not been published, but the EPSS score is below 1% and the vulnerability is not listed in CISA KEV. The bug requires interaction with the media stack and can be triggered by local or privileged processes that submit decoding jobs; it does not provide remote code execution or elevated privilege escalation directly. Because the issue causes a resource leak that may lead to system stall, the risk is moderate but low probability of exploitation under current metrics.

Generated by OpenCVE AI on September 18, 2026 at 08:18 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Apply a kernel update that includes the patched wave5 media driver.
  • Restart affected video service processes to clear any stale job queues if a system restart is not immediately possible.
  • Avoid running many concurrent v4l2h264dec instances until a patch is applied to reduce the chance of a drain hang.

Generated by OpenCVE AI on September 18, 2026 at 08:18 UTC.

Tracking

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Advisories

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History

Fri, 18 Sep 2026 08:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-668

Wed, 16 Sep 2026 10:45:00 +0000

Type Values Removed Values Added
Description 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
Title media: chips-media: wave5: Defer job_finish() only when a DEC_PIC was queued
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

Subscriptions

Linux Linux Kernel
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-09-16T10:31:37.185Z

Reserved: 2026-09-11T19:38:34.771Z

Link: CVE-2026-89867

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-16T11:16:54.843

Modified: 2026-09-16T11:16:54.843

Link: CVE-2026-89867

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-18T20:30:15Z

Weaknesses
  • CWE-668

    Exposure of Resource to Wrong Sphere