Bug 2495941 (CVE-2026-53329)

Summary: CVE-2026-53329 kernel: drm/amd/display: Use krealloc_array() in dal_vector_reserve()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's `drm/amd/display` component. The `dal_vector_reserve()` function calculates memory allocation size using 32-bit arithmetic, which can lead to an integer overflow. This overflow causes a smaller memory buffer to be allocated than intended, resulting in a heap overflow when data is subsequently appended to the vector. An attacker could potentially use this to cause a denial of service or execute arbitrary code.
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Description OSIDB Bzimport 2026-07-01 14:02:28 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/amd/display: Use krealloc_array() in dal_vector_reserve()

[Why & How]
dal_vector_reserve() computes the allocation size as
"capacity * vector->struct_size" using uint32_t arithmetic, which can
silently wrap to a small value on overflow. This would cause krealloc to
return a smaller buffer than expected, leading to heap overflows on
subsequent vector appends.

Replace krealloc() with krealloc_array() which performs an internal
overflow check and returns NULL on wrap, preventing the issue.

(cherry picked from commit 37668568641ccc4cc1dbca4923d0a16609dd5707)
Comment 1 Mauro Matteo Cascella 2026-07-01 17:47:32 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026070142-CVE-2026-53329-ccf5@gregkh/T