https://vulnerability.circl.lu Contains only the most 10 recent entries. http://www.rssboard.org/rss-specification python-feedgen en Wed, 30 Sep 2026 04:39:08 +0000 https://vulnerability.circl.lu/vuln/cve-2026-68166 <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>userfaultfd: prevent registration of special VMAs</p> <p>Vova Tokarev says:</p> <p>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.</p> <p>Update vma_can_userfault() to reject VM_SHADOW_STACK.</p> <p>While on it, also reject VM_SPECIAL so that if a driver would implement vm_uffd_ops, it wouldn&#39;t be possible to register special VMAs with userfaultfd.</p> <p>Since VM_SPECIAL includes VM_DONTEXPAND which is set but hugetlb, exclude hugetlb VMAs from the check for VM_SPECIAL.</p> <p><strong>Affected:</strong> Linux</p> <p>In the Linux kernel, the following vulnerability has been resolved:</p> <p>userfaultfd: prevent registration of special VMAs</p> <p>Vova Tokarev says:</p> <p>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.</p> <p>Update vma_can_userfault() to reject VM_SHADOW_STACK.</p> <p>While on it, also reject VM_SPECIAL so that if a driver would implement vm_uffd_ops, it wouldn&#39;t be possible to register special VMAs with userfaultfd.</p> <p>Since VM_SPECIAL includes VM_DONTEXPAND which is set but hugetlb, exclude hugetlb VMAs from the check for VM_SPECIAL.</p> https://vulnerability.circl.lu/vuln/cve-2026-68166