accel/amdxdna: Fix locally exploitable BUG_ON in amdxdna_insert_pages()

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Summary

CVECVE-2026-74716
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-22 16:16:46 UTC
Updated2026-08-22 16:16:46 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: accel/amdxdna: Fix locally exploitable BUG_ON in amdxdna_insert_pages() In amdxdna_insert_pages(), vm_flags_mod() sets VM_MIXEDMAP and clears VM_PFNMAP. If an unprivileged userspace process mmaps a non-imported GEM object and then calls madvise(MADV_DONTNEED), the PTEs will be successfully cleared because VM_MIXEDMAP allows this (unlike VM_PFNMAP). When userspace subsequently accesses the memory, drm_gem_shmem_fault() handles the page fault and attempts to map the backing shmem page via vmf_insert_pfn() which calls vmf_insert_pfn_prot(). Because the backing shmem page is normal system memory (pfn_valid(pfn) is true) and the VMA now has VM_MIXEDMAP set, won't this predictably trigger the explicit assertion BUG_ON((vma->vm_flags & VM_MIXEDMAP) && pfn_valid(pfn)) Fix by removing the vm_flags_mod() call and replacing the vm_insert_pages() pre-population with the handle_mm_fault() loop that was already used for the import (dma-buf) path.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected e486147c912f653ef4b60a6c7dbd4168a4c56a9f 13339132d89d00b513dff0730bff3a313b9b13b5 git Not specified
CNA Linux Linux affected e486147c912f653ef4b60a6c7dbd4168a4c56a9f 4a19f7ab5972ef608b31ae921419bc3e04b3f8ad git Not specified
CNA Linux Linux affected 6.16 Not specified
CNA Linux Linux unaffected 6.16 semver Not specified
CNA Linux Linux unaffected 7.1.9 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/13339132d89d00b513dff0730bff3a313b9b13b5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4a19f7ab5972ef608b31ae921419bc3e04b3f8ad 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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