Use-after-free in Linux kernel - CVE-2026-64421
Published: July 27, 2026
Vulnerability identifier: #VU139515
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-64421
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to use-after-free in mxc_isi_remove() and the imx8-isi media cleanup path when removing the imx8_isi module. A local user can trigger module removal to cause a denial of service.
The issue occurs because media links are removed after the media entity pads they reference have already been freed.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-64421
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.100-1
linux (Debian package) - update to 6.12.100-1
External References
- https://git.kernel.org/stable/c/b670bf89824ede5d07d20bb9bfbafb754846081d
- https://git.kernel.org/stable/c/ba2aa5d325270cd965c44458c5ff5ab555e6af51
- https://git.kernel.org/stable/c/c12a5b2261351cd3b03921ce4720332ff5184b50
- https://git.kernel.org/stable/c/d22fb719654bfde6f682c9f14629f5f9534175b7
- https://git.kernel.org/stable/c/ef382a6baf0a95cf199fdf6bba2fd08e58b0a249