CVE-2026-89741Revert "media: v4l2-dev: fix error handling in __video_register_device()"
Updated under an hour ago ()
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from e5c8e62ae551e0ad2e15412aa0c57c2856d59677 before 8b998c171ed875e402e1fd1c5cd619e4ca05e9c1; 8b451a9a46f2bfc510e6d5c2492df91647586184 builds before 3de14b4f681a1b3c6d375d98d9d37a55ebb85349; from b6be1f5633eae200af2527e9eeb7f51be5739b0f before 8027f82c0f5474ed72448e160ee9778051fa1f49; from ae7b143e05b36fc69d6571751855946cc45064c6 before 2ac009a65d2385e9f0799eaf9d9694a29153a161; 2429bb9fad88c8fa84c4956b0a21cf5afe5e92b7 builds before 712ca1cf756de2557a116e0df55791bac0c9f99e; from 2a934fdb01db6458288fc9386d3d8ceba6dd551a before aad08b5f67d2a8116e1a00bce2611c1513b10bce; from 2a934fdb01db6458288fc9386d3d8ceba6dd551a before ce792b94e03882108019ba996c1a7c4d4e09be2c; from 2a934fdb01db6458288fc9386d3d8ceba6dd551a before e7600f5cee5de14065f950807931d6e6d40fb2d7; and 9 more ranges | CNA record |
References
- https://git.kernel.org/stable/c/8b998c171ed875e402e1fd1c5cd619e4ca05e9c1
- https://git.kernel.org/stable/c/3de14b4f681a1b3c6d375d98d9d37a55ebb85349
- https://git.kernel.org/stable/c/8027f82c0f5474ed72448e160ee9778051fa1f49
- https://git.kernel.org/stable/c/2ac009a65d2385e9f0799eaf9d9694a29153a161
- https://git.kernel.org/stable/c/712ca1cf756de2557a116e0df55791bac0c9f99e
- https://git.kernel.org/stable/c/aad08b5f67d2a8116e1a00bce2611c1513b10bce
- https://git.kernel.org/stable/c/ce792b94e03882108019ba996c1a7c4d4e09be2c
- https://git.kernel.org/stable/c/e7600f5cee5de14065f950807931d6e6d40fb2d7
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.