CVE-2026-68166
CVE-2026-68166: 1 tracked advisory record across Red Hat. Compare vendor sources and published fix guidance.
Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.
Vendor advisory comparison
Red Hat
1 advisory- Advisory severityHigh7.3
High [CVE-2026-68166] Linux kernel: Arbitrary code execution via userfaultfd shadow stack manipulation
CVE-2026-68166Source published Source updated
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. A local attacker with userfaultfd access could register on shadow stack Virtual Memory Areas (VMAs). By discarding a page and injecting a…
- Affected products in this advisory
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 9
- Red Hat package: kernel
- Source-reported affected versions
- Affected-version details not available in this record.
- Source-reported fixed versions
- kernel-0:6.12.0-211.50.1.el10_2
- kernel-0:5.14.0-687.44.1.el9_8
- RHSA-2026:61887
- RHSA-2026:63129
- Mitigation guidance
- No mitigation guidance extracted; consult the source.
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