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CVE-2024-26914: drm/amd/display: fix incorrect mpc_combine array size

• Severity: high (CVSS 7.8 v3.1)
• 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: 2024-04-17 · updated 2026-08-04
• Weakness: CWE-129

Description

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: fix incorrect mpc_combine array size [why] MAX_SURFACES is per stream, while MAX_PLANES is per asic. The mpc_combine is an array that records all the planes per asic. Therefore MAX_PLANES should be used as the array size. Using MAX_SURFACES causes array overflow when there are more than 3 planes. [how] Use the MAX_PLANES for the mpc_combine array size.

Affected products

• Linux kernel: from 6.7 before 6.7.6; 6.8-rc1, 6.8-rc2 — fixed in 6.7.6

How to fix

Upgrade to a fixed version: Linux kernel 6.7.6. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0bd8ef618a42d7e6ea3f701065264e15678025e3
• https://git.kernel.org/stable/c/39079fe8e660851abbafa90cd55cbf029210661f
• https://git.kernel.org/stable/c/0bd8ef618a42d7e6ea3f701065264e15678025e3
• https://git.kernel.org/stable/c/39079fe8e660851abbafa90cd55cbf029210661f

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