# CVE-2026-89741

## Summary

- **CVE ID:** CVE-2026-89741
- **Severity:** HIGH
- **CVSS Score:** 7.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** N/A
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 14, 2026

## Description

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

Revert "media: v4l2-dev: fix error handling in __video_register_device()"

This reverts commit 2a934fdb01db6458288fc9386d3d8ceba6dd551a.

The intentions of that patch were good, but it doesn't work.

The idea is that if device_register fails, you have to do a put_device
to let the ref counter release resources.

However, the V4L2 API says that if video_register_device() fails, then
you have to call video_device_release(), which kfree()s the video_device
struct.

But the put_device() will already have freed the struct, so you end
up in a double-free scenario.

There is not really a good way of fixing this without breaking
video_register_device() into two parts, one that initializes everything,
and one that does the actual device_register, and then converting all
V4L2 drivers to this new model.

That is a massive job, and it is very unlikely that device_register
will fail.

So rather than ending up in a double-free scenario, just revert this
patch, and in that case we'll have a small memory leak. Which is a lot
more robust.

## Affected Products

- Linux — Linux (2429bb9fad88c8fa84c4956b0a21cf5afe5e92b7)
- Linux — Linux (2a934fdb01db6458288fc9386d3d8ceba6dd551a)
- Linux — Linux (ee141706e701356dda41c6fed9ee18bf427c28e3)
- Linux — Linux (e5c8e62ae551e0ad2e15412aa0c57c2856d59677)
- Linux — Linux (8b451a9a46f2bfc510e6d5c2492df91647586184)
- Linux — Linux (b6be1f5633eae200af2527e9eeb7f51be5739b0f)
- Linux — Linux (ae7b143e05b36fc69d6571751855946cc45064c6)
- Linux — Linux (4451412739ed33a49b34624299394ee575116d0c)
- Linux — Linux (6.12.35)
- Linux — Linux (5.4.295)
- Linux — Linux (5.10.239)
- Linux — Linux (5.15.186)
- Linux — Linux (6.1.142)
- Linux — Linux (6.6.95)
- Linux — Linux (6.15.4)
- Linux — Linux (6.16)
- Linux — Linux (0)
- Linux — Linux (6.12.109)
- Linux — Linux (6.18.50)
- Linux — Linux (7.2.4)
- Linux — Linux (7.3-rc1)
- Linux — Linux (5.10.270)
- Linux — Linux (5.15.221)
- Linux — Linux (6.1.188)
- Linux — Linux (6.6.157)

## References

- [CNA](https://git.kernel.org/stable/c/712ca1cf756de2557a116e0df55791bac0c9f99e)
- [CNA](https://git.kernel.org/stable/c/aad08b5f67d2a8116e1a00bce2611c1513b10bce)
- [CNA](https://git.kernel.org/stable/c/ce792b94e03882108019ba996c1a7c4d4e09be2c)
- [CNA](https://git.kernel.org/stable/c/e7600f5cee5de14065f950807931d6e6d40fb2d7)
- [CNA](https://git.kernel.org/stable/c/8b998c171ed875e402e1fd1c5cd619e4ca05e9c1)
- [CNA](https://git.kernel.org/stable/c/3de14b4f681a1b3c6d375d98d9d37a55ebb85349)
- [CNA](https://git.kernel.org/stable/c/8027f82c0f5474ed72448e160ee9778051fa1f49)
- [CNA](https://git.kernel.org/stable/c/2ac009a65d2385e9f0799eaf9d9694a29153a161)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.16%
- **EPSS Percentile:** 6.0

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._