What’s Vulnerable › Vulnerabilities

CVE-2026-89817: drm/gud: NUL-terminate TV mode names read from the device

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-16 · updated 2026-10-19

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.

Affected products

• Linux kernel: 5.13 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

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

Get alerted when CVE-2026-89817 or the next vulnerability affects your stack