Bug 2454848 (CVE-2026-23468)

Summary: CVE-2026-23468 kernel: drm/amdgpu: Limit BO list entry count to prevent resource exhaustion
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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A flaw was found in the Linux kernel's drm/amdgpu component. A local user can exploit this vulnerability by providing an excessively large number of Buffer Object (BO) list entries through the bo_number field. This can lead to excessive memory allocation and prolonged processing times, potentially causing a memory exhaustion attack and resulting in a Denial of Service (DoS) for the system.
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Description OSIDB Bzimport 2026-04-03 16:04:04 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/amdgpu: Limit BO list entry count to prevent resource exhaustion

Userspace can pass an arbitrary number of BO list entries via the
bo_number field. Although the previous multiplication overflow check
prevents out-of-bounds allocation, a large number of entries could still
cause excessive memory allocation (up to potentially gigabytes) and
unnecessarily long list processing times.

Introduce a hard limit of 128k entries per BO list, which is more than
sufficient for any realistic use case (e.g., a single list containing all
buffers in a large scene). This prevents memory exhaustion attacks and
ensures predictable performance.

Return -EINVAL if the requested entry count exceeds the limit

(cherry picked from commit 688b87d39e0aa8135105b40dc167d74b5ada5332)
Comment 1 Jon Moroney 2026-04-03 17:46:54 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026040321-CVE-2026-23468-8be9@gregkh/T