CVE-2026-68166: Linux

Описание

Оригинално описание

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.

Засегнати продукти

• Linux Linux: 54007f818206dc27309ca423df4c87dd160a7208 преди d974b4b786214883bd8e56bda10b454c80fd6205; 54007f818206dc27309ca423df4c87dd160a7208 преди 495a28d5a100be1b232633f4c2dcc42ba10b3796; 54007f818206dc27309ca423df4c87dd160a7208 преди 165613191ad9d034bf17c00e3a142f9561597ec5; 54007f818206dc27309ca423df4c87dd160a7208 преди 0c26202b157f1efc3cd2f26f5c30f59b508a6a5d; 54007f818206dc27309ca423df4c87dd160a7208 преди 3c58f641e813c3c71039f8fd4d4e2a3aab713288
• Linux Linux: 6.6; преди 6.6; 6.6.153 до 6.6.*; 6.12.105 до 6.12.*; 6.18.44 до 6.18.*; 7.1.6 до 7.1.*; от 7.2 нататък

История

Други уязвимости в Linux Linux

• 8.1CVE-2026-99270
• 7.8CVE-2026-99269
• CVE-2026-99265
• CVE-2026-99261
• CVE-2026-99260

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-68166
• https://nvd.nist.gov/vuln/detail/CVE-2026-68166
• https://git.kernel.org/stable/c/d974b4b786214883bd8e56bda10b454c80fd6205
• https://git.kernel.org/stable/c/495a28d5a100be1b232633f4c2dcc42ba10b3796
• https://git.kernel.org/stable/c/165613191ad9d034bf17c00e3a142f9561597ec5
• https://git.kernel.org/stable/c/0c26202b157f1efc3cd2f26f5c30f59b508a6a5d
• https://git.kernel.org/stable/c/3c58f641e813c3c71039f8fd4d4e2a3aab713288