Bug 2393494 (CVE-2025-39705)

Summary: CVE-2025-39705 kernel: drm/amd/display: fix a Null pointer dereference vulnerability
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-09-05 18:02:16 UTC 
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)
Comment 1 Jon Moroney 2025-09-05 21:59:32 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025090549-CVE-2025-39705-6ac5@gregkh/T