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CVE-2026-89887

HIGHCVSS 7.8/10

Last modified

CVE-2026-89887 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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..

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.

Metrics

CVSS 3.1
7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 39c5c4471b8d793daf868bd004e56ed420e89707, < 9e4693436c7dcf8584002500ce4b434b79bbf9ed; >= 39c5c4471b8d793daf868bd004e56ed420e89707, < 81e9765878d3ac8ad18e3a683332b5d6bc3a0e33; >= 39c5c4471b8d793daf868bd004e56ed420e89707, < 8a02ee6c1c4e88f3a0442bd60d3c77db9a30db5e; >= 39c5c4471b8d793daf868bd004e56ed420e89707, < 7512838a19af0a284a58435292243fad21e57ff1; >= 39c5c4471b8d793daf868bd004e56ed420e89707, < 25e2505866c577db2661e4d431f0907c6ec9a3b4; >= 39c5c4471b8d793daf868bd004e56ed420e89707, < af81f35e4f429e769b784754e1aa4d7a922470ac; >= 39c5c4471b8d793daf868bd004e56ed420e89707, < 09453b467990e8ef8fe09f45a685f9a625248d33; >= 39c5c4471b8d793daf868bd004e56ed420e89707, < 5d1b3dea5a44124bab6c14a2d71b977dabed54e7
LinuxLinux4.16

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-89887?
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.
How severe is CVE-2026-89887?
CVE-2026-89887 has a CVSS score of 7.8/10 (HIGH severity).
How do I fix CVE-2026-89887?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST