CVE-2026-74716: Linux

Описание

Оригинално описание

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.

Засегнати продукти

• Linux Linux: e486147c912f653ef4b60a6c7dbd4168a4c56a9f преди 618fc8dc219c11b8b85f0c8e3f7ff46cc1544339; e486147c912f653ef4b60a6c7dbd4168a4c56a9f преди 13339132d89d00b513dff0730bff3a313b9b13b5; e486147c912f653ef4b60a6c7dbd4168a4c56a9f преди 4a19f7ab5972ef608b31ae921419bc3e04b3f8ad
• Linux Linux: 6.16; преди 6.16; 6.18.57 до 6.18.*; 7.1.9 до 7.1.*; 7.2 до *

История

Други уязвимости в Linux Linux

• 8.1CVE-2026-99270
• 7.8CVE-2026-99269
• CVE-2026-99268
• CVE-2026-99266
• CVE-2026-99267

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-74716
• https://nvd.nist.gov/vuln/detail/CVE-2026-74716
• https://git.kernel.org/stable/c/618fc8dc219c11b8b85f0c8e3f7ff46cc1544339
• https://git.kernel.org/stable/c/13339132d89d00b513dff0730bff3a313b9b13b5
• https://git.kernel.org/stable/c/4a19f7ab5972ef608b31ae921419bc3e04b3f8ad