# CVE-2026-89875: media: ti: vpe: quiesce overflow recovery before freeing streams

> A race condition in the TI VPE driver allows use-after-free of stream resources, potentially leading to code execution or system crashes.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 16 Sep 2026
- **Updated:** 19 Oct 2026
- **Also known as:** DEBIAN-CVE-2026-89875, GHSA-pmfq-36x7-p9v2, UBUNTU-CVE-2026-89875

## What is CVE-2026-89875?

CVE-2026-89875 is a high-severity use after free vulnerability in Linux, published on 16 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

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

media: ti: vpe: quiesce overflow recovery before freeing streams

The VIP overflow recovery worker is armed from the hardirq handler when a
FIFO overflow is detected, and the list-complete path looks the stream up
through the VPDMA list private pointer. Both keep touching stream, port
and device state; the recovery worker also resets the parser and VPDMA,
repopulates the descriptor list, and re-enables the per-list IRQs.

vip_stop_streaming() masks and clears the per-list IRQs, but it neither
synchronizes the hardirq handler nor disables recovery_work. An overflow
IRQ that has already queued recovery_work, or a list-complete IRQ in
flight when the stream is torn down, can therefore still dereference the
stream after its resources are released: the descriptor list is freed by
vip_release_stream() on file release, and the stream itself by
free_stream() on unbind/remove.

Drain the recovery worker and the IRQ handler at both teardown points
through a shared vip_quiesce_stream() helper, before any stream-owned
resource is released. disable_work_sync() cancels pending recovery_work,
drains a running instance, and raises its disable depth, so a subsequent
schedule_work() issued by a racing IRQ handler is rejected at the
workqueue scheduler: recovery_work cannot be requeued after
disable_work_sync() takes effect. The worker may still re-enable the
per-list IRQs before disable_work_sync() returns; disable_irqs() then
masks those sources and synchronize_irq() waits for any in-flight handler
that still dereferences stream state. In vip_stop_streaming() the helper
runs before the parser is stopped, since a worker drained by
disable_work_sync() may re-enable the parser before exiting and would
otherwise undo the stop. recovery_work is created disabled and enabled in
vip_start_streaming() before IRQs, pairing the enable with the teardown
disable across the streaming lifecycle.

This issue was found by an in-house static analysis tool and confirmed
by manual code review.

## Which versions are affected by CVE-2026-89875?


## How do I fix CVE-2026-89875?

Apply the vendor's patch.

## Is CVE-2026-89875 being exploited?

There is no known exploitation of CVE-2026-89875 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-89875 and fix it if it is affected.

What it is: CVE-2026-89875 is a high-severity use after free vulnerability in Linux, published on 16 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-89875 in the wild and no public exploit code.

Affected product: Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-89875/ (Markdown: https://insights.sbomify.com/CVE-2026-89875/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-89875
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-89875
- OSV: https://osv.dev/vulnerability/CVE-2026-89875

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-89875/
Summaries are generated and may contain mistakes; the official description above is the record.