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CVE-2026-68303: drm/vc4: hvs/v3d: Fix null dereference in unbind

• 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: 2026-08-10 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: drm/vc4: hvs/v3d: Fix null dereference in unbind The hvs and v3d drivers use dev_get_drvdata(master) in their unbind functions. Since the vc4-drm gets removed before its dependent drivers (vc4_hvs/vc4_v3d) the vc4_hvs_unbind/vc4_v3d_unbind functions try to get drvdata of its master and fails with a null dereference error. Use the data pointer passed to the unbind functions directly instead of dev_get_drvdata(master). This avoids using potentially freed memory.

Affected products

• Linux: 4.4 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/261f0a3f0ac03248284f5116d3258f89c9642215
• https://git.kernel.org/stable/c/3be8dcc1a5854cf24cc332e0d6fc865c47ff49a1
• https://git.kernel.org/stable/c/3ed3d0b31500b11c8fd9ef96b7703edbccb32e2e
• https://git.kernel.org/stable/c/708688ec31ac6b35103ba364dc300a09930079d4
• https://git.kernel.org/stable/c/7dc3680b7ffe01add3e9299fde8471d2dd53a8ae
• https://git.kernel.org/stable/c/8f62aae059e06746a18a00af27179c3c0f17f4c7

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