CVE-2026-68166

Not enough EPSS history yet.

In the Linux kernel, the following vulnerability has been resolved: userfaultfd: prevent registration of special VMAs Vova Tokarev says: userfaultfd allows registration on shadow stack VMAs. With userfaultfd access, you can register on the shadow stack, discard a page ... and inject a page with chosen return addresses via UFFDIO_COPY. Update vma_can_userfault() to reject VM_SHADOW_STACK. While on it, also reject VM_SPECIAL so that if a driver would implement vm_uffd_ops, it wouldn't be possible to register special VMAs with userfaultfd. Since VM_SPECIAL includes VM_DONTEXPAND which is set but hugetlb, exclude hugetlb VMAs from the check for VM_SPECIAL.

• git.kernel.orghttps://git.kernel.org/stable/c/0c26202b157f1efc3cd2f26f5c30f59b508a6a5d
• git.kernel.orghttps://git.kernel.org/stable/c/165613191ad9d034bf17c00e3a142f9561597ec5
• git.kernel.orghttps://git.kernel.org/stable/c/3c58f641e813c3c71039f8fd4d4e2a3aab713288

No related CVEs by CWE or product.