CVE-2026-89817
Published Sep 16, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: drm/gud: NUL-terminate TV mode names read from the device gud_connector_add_tv_mode() reads a buffer of fixed-size mode names from the USB device and passes pointers into it to drm_mode_create_tv_properties_legacy(), which calls strlen() on each one. Nothing guarantees the device NUL-terminates a name, so strlen() can run past the end of a slot and, for the last mode, past the end of the allocation. Terminate each name at the end of its slot before use.
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References
Other References
https://git.kernel.org/stable/c/08c8ec28547987e55a90c662f8795e05c2925498
https://git.kernel.org/stable/c/500cb24cd61bad8a2747ddfc49b7034899c82d94
https://git.kernel.org/stable/c/6ea61f1d4cbaa0db937e31bffc041fb8afeacf52
https://git.kernel.org/stable/c/89210cb5ff8fdbe055c97ac688be2268f6c815ae
https://git.kernel.org/stable/c/9096edfd6f2edbc79612b482547e0972edbcfe4b
https://git.kernel.org/stable/c/b86438a5c6b0250ccb07dd380184d1e70e0dea6c
https://git.kernel.org/stable/c/d0f3312f7800eb0e00d1264f66104c788f43dd69
Frequently Asked Questions
What is CVE-2026-89817? +
In the Linux kernel, the following vulnerability has been resolved:
drm/gud: NUL-terminate TV mode names read from the device
gud_connector_add_tv_mode() reads a buffer of fixed-size mode names from
the USB device and passes pointers into it to
drm_mode_create_tv_properties_legacy(), which calls strlen() on each one.
Nothing guarantees the device NUL-terminates a name, so strlen() can run
past the end of a slot and, for the last mode, past the end of the
allocation.
Terminate each name at the end of its slot before use.
How do I check if I'm vulnerable to CVE-2026-89817? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.