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CVE-2025-21985: drm/amd/display: Fix out-of-bound accesses

• Severity: high (CVSS 7.1 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: 2025-04-01 · updated 2026-07-30
• Weakness: CWE-125

Description

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Fix out-of-bound accesses [WHAT & HOW] hpo_stream_to_link_encoder_mapping has size MAX_HPO_DP2_ENCODERS(=4), but location can have size up to 6. As a result, it is necessary to check location against MAX_HPO_DP2_ENCODERS. Similiarly, disp_cfg_stream_location can be used as an array index which should be 0..5, so the ASSERT's conditions should be less without equal.

Affected products

• Linux kernel: from 4.15 before 6.12.20; from 6.13 before 6.13.8; 6.14-rc1 — fixed in 6.12.20, 6.13.8

How to fix

Upgrade to a fixed version: Linux kernel 6.12.20, 6.13.8. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/36793d90d76f667d26c6dd025571481ee0c96abc
• https://git.kernel.org/stable/c/8adbb2a98b00926315fd513b5fe2596b5716b82d
• https://git.kernel.org/stable/c/9aedc776b11038f04f4641241bb7e877781e4aa4

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