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CVE-2025-39705: drm/amd/display: fix a Null pointer dereference vulnerability

• 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: 2025-09-05 · updated 2026-10-30
• Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: fix a Null pointer dereference vulnerability [Why] A null pointer dereference vulnerability exists in the AMD display driver's (DC module) cleanup function dc_destruct(). When display control context (dc->ctx) construction fails (due to memory allocation failure), this pointer remains NULL. During subsequent error handling when dc_destruct() is called, there's no NULL check before dereferencing the perf_trace member (dc->ctx->perf_trace), causing a kernel null pointer dereference crash. [How] Check if dc->ctx is non-NULL before dereferencing. (Updated commit text and removed unnecessary error message) (cherry picked from commit 9dd8e2ba268c636c240a918e0a31e6feaee19404)

Affected products

• Linux kernel: from 4.15 before 6.12.44; from 6.13 before 6.16.4 — fixed in 6.12.44, 6.16.4
• Linux: 4.15 — fixed in 6.17

How to fix

Upgrade to a fixed version: Linux kernel 6.12.44, 6.16.4; Linux 6.17. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0961673cc5f0055957aa46f25eb4ef6c07e00165
• https://git.kernel.org/stable/c/0d9f4f202de1522aadc7a827aba0ae92b3d70937
• https://git.kernel.org/stable/c/1bcf63a44381691d6192872801f830ce3250e367
• https://git.kernel.org/stable/c/4ade995b9b25b3c6e8dc42c27070340f1358d8c8
• https://git.kernel.org/stable/c/dd9699368f37aca4f216857847a46a8a2c289f94

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