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CVE-2025-21990: drm/amdgpu: NULL-check BO's backing store when determining GFX12 PTE flags

• Severity: medium (CVSS 5.5 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: 2025-04-02 · updated 2026-06-17
• Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: NULL-check BO's backing store when determining GFX12 PTE flags PRT BOs may not have any backing store, so bo->tbo.resource will be NULL. Check for that before dereferencing. (cherry picked from commit 3e3fcd29b505cebed659311337ea03b7698767fc)

Affected products

• Linux kernel: from 6.11 before 6.12.20; from 6.13 before 6.13.8; 6.14-rc1, 6.14-rc2, 6.14-rc3, 6.14-rc4, 6.14-rc5, 6.14-rc6 — 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/6cc30748e17ea2a64051ceaf83a8372484e597f1
• https://git.kernel.org/stable/c/72235808eabea93055b459a63443bd9cd6b08aa4
• https://git.kernel.org/stable/c/af23e39b9e9280b1f6299b6f2fa090a1694240ad

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