CVE-2026-89887
Published: September 18, 2026Last modified: October 6, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: media: i2c: ov7740: fix use-after-destroy in remove The ov7740_remove() function had a severe teardown order bug where it destroyed the driver's mutex before freeing the V4L2 control handler which relies on that mutex, leading to a use-after-destroy kernel panic. Furthermore, the driver explicitly called v4l2_ctrl_handler_free() and mutex_destroy() sequentially, but then called ov7740_free_controls() which invokes both of them a second time, resulting in a double-free. This patch fixes the issue by unregistering the subdevice first, and relying exclusively on ov7740_free_controls() to safely tear down the mutex and control handler in the correct order.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.8 |
| Attack Vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity impact | HIGH |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Fixed (6.1.189-r0) |
| 25 LTS | linux-lts | Fixed (6.12.111-r0) | |
| Stream | linux-lts | Fixed (6.18.53-r0) |
References
- https://git.kernel.org/stable/c/09453b467990e8ef8fe09f45a685f9a625248d33
- https://git.kernel.org/stable/c/25e2505866c577db2661e4d431f0907c6ec9a3b4
- https://git.kernel.org/stable/c/5d1b3dea5a44124bab6c14a2d71b977dabed54e7
- https://git.kernel.org/stable/c/7512838a19af0a284a58435292243fad21e57ff1
- https://git.kernel.org/stable/c/81e9765878d3ac8ad18e3a683332b5d6bc3a0e33
- https://git.kernel.org/stable/c/8a02ee6c1c4e88f3a0442bd60d3c77db9a30db5e
- https://git.kernel.org/stable/c/9e4693436c7dcf8584002500ce4b434b79bbf9ed
- https://git.kernel.org/stable/c/af81f35e4f429e769b784754e1aa4d7a922470ac