drm/amdkfd: Let driver decide buffer size at AMDKFD_IOC_GET_DMABUF_INFO ioctl

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-93823
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-24 17:17:15 UTC
Updated2026-09-25 13:17:23 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: Let driver decide buffer size at AMDKFD_IOC_GET_DMABUF_INFO ioctl amdkfd driver needs allocate buffer to return bo metadata to user space. The buffer size is controlled by user currently. It is a potential security issue that hostile value (e.g. 2 GiB) lets any render-group user trigger order-MAX allocation/OOM in kernel context. This patch first finds bo metadata size. If the size is smaller than user provided value drive can safely allocate buffer in kernel space and copy to user space buffer. If not, driver will let user know, not allocate and copy. User will redo with new buffer in user space. This patch lets driver decide buffer allocation size to avoid potential hostile size from user space. (cherry picked from commit f54ce9e8cbd3abe0eda3a285f54dc4f572fe589a)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 1dde0ea95b782425b95455d487cb44991525a1d1 a65ccabde6deb95baf9442bd98299e2248884162 git Not specified
CNA Linux Linux affected 1dde0ea95b782425b95455d487cb44991525a1d1 2d9fd0f01550aab4a0a1984b4379e50545906248 git Not specified
CNA Linux Linux affected 1dde0ea95b782425b95455d487cb44991525a1d1 8242a8d9d7194d5ef8a8b38a5621ca0966a3ec15 git Not specified
CNA Linux Linux affected 5.0 Not specified
CNA Linux Linux unaffected 5.0 semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a65ccabde6deb95baf9442bd98299e2248884162 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8242a8d9d7194d5ef8a8b38a5621ca0966a3ec15 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2d9fd0f01550aab4a0a1984b4379e50545906248 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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