Revert "media: v4l2-dev: fix error handling in __video_register_device()"
Summary
| CVE | CVE-2026-89741 |
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| State | PUBLISHED |
|---|
| Assigner | Linux |
|---|
| Source Priority | CVE Program / NVD first with legacy fallback |
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| Published | 2026-09-11 20:20:04 UTC |
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| Updated | 2026-09-11 20:20:04 UTC |
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| 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. |
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Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|
| CNA |
Linux |
Linux |
affected 2429bb9fad88c8fa84c4956b0a21cf5afe5e92b7 712ca1cf756de2557a116e0df55791bac0c9f99e git |
Not specified |
| CNA |
Linux |
Linux |
affected 2a934fdb01db6458288fc9386d3d8ceba6dd551a aad08b5f67d2a8116e1a00bce2611c1513b10bce git |
Not specified |
| CNA |
Linux |
Linux |
affected 2a934fdb01db6458288fc9386d3d8ceba6dd551a ce792b94e03882108019ba996c1a7c4d4e09be2c git |
Not specified |
| CNA |
Linux |
Linux |
affected 2a934fdb01db6458288fc9386d3d8ceba6dd551a e7600f5cee5de14065f950807931d6e6d40fb2d7 git |
Not specified |
| CNA |
Linux |
Linux |
affected ee141706e701356dda41c6fed9ee18bf427c28e3 git |
Not specified |
| CNA |
Linux |
Linux |
affected e5c8e62ae551e0ad2e15412aa0c57c2856d59677 git |
Not specified |
| CNA |
Linux |
Linux |
affected 8b451a9a46f2bfc510e6d5c2492df91647586184 git |
Not specified |
| CNA |
Linux |
Linux |
affected b6be1f5633eae200af2527e9eeb7f51be5739b0f git |
Not specified |
| CNA |
Linux |
Linux |
affected ae7b143e05b36fc69d6571751855946cc45064c6 git |
Not specified |
| CNA |
Linux |
Linux |
affected 4451412739ed33a49b34624299394ee575116d0c git |
Not specified |
| CNA |
Linux |
Linux |
affected 6.12.35 6.12.109 semver |
Not specified |
| CNA |
Linux |
Linux |
affected 5.4.295 5.5 semver |
Not specified |
| CNA |
Linux |
Linux |
affected 5.10.239 5.11 semver |
Not specified |
| CNA |
Linux |
Linux |
affected 5.15.186 5.16 semver |
Not specified |
| CNA |
Linux |
Linux |
affected 6.1.142 6.2 semver |
Not specified |
| CNA |
Linux |
Linux |
affected 6.6.95 6.7 semver |
Not specified |
| CNA |
Linux |
Linux |
affected 6.15.4 6.16 semver |
Not specified |
| CNA |
Linux |
Linux |
affected 6.16 |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.16 semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.12.109 6.12.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.18.50 6.18.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 7.2.4 7.2.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 7.3-rc1 * original_commit_for_fix |
Not specified |
References
| Reference | Source | Link | Tags |
|---|
| git.kernel.org/stable/c/ce792b94e03882108019ba996c1a7c4d4e09be2c |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/e7600f5cee5de14065f950807931d6e6d40fb2d7 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/712ca1cf756de2557a116e0df55791bac0c9f99e |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/aad08b5f67d2a8116e1a00bce2611c1513b10bce |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| CVE Program record |
CVE.ORG |
www.cve.org |
canonical |
| NVD vulnerability detail |
NVD |
nvd.nist.gov |
canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.