CVE-2026-74716 - accel/amdxdna: Fix locally exploitable BUG_ON in amdxdna_insert_pages()

CVE-2026-74716 - accel/amdxdna: Fix locally exploitable BUG_ON in amdxdna_insert_pages()

https://cvefeed.io/rssfeed/latest.atom / Sat, 08/22/2026 - 19:27
CVE ID :CVE-2026-74716
Published : Aug. 22, 2026, 3:33 p.m. | 29 minutes ago
Description :In 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.
Severity: 0.0 | NA
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