CVE-2026-68166
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
userfaultfd: prevent registration of special VMAs
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.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 54007f818206dc27309ca423df4c87dd160a7208 | affected | git | d974b4b786214883bd8e56bda10b454c80fd6205 | Unavailable | None listed |
| 54007f818206dc27309ca423df4c87dd160a7208 | affected | git | 495a28d5a100be1b232633f4c2dcc42ba10b3796 | Unavailable | None listed |
| 54007f818206dc27309ca423df4c87dd160a7208 | affected | git | 165613191ad9d034bf17c00e3a142f9561597ec5 | Unavailable | None listed |
| 54007f818206dc27309ca423df4c87dd160a7208 | affected | git | 0c26202b157f1efc3cd2f26f5c30f59b508a6a5d | Unavailable | None listed |
| 54007f818206dc27309ca423df4c87dd160a7208 | affected | git | 3c58f641e813c3c71039f8fd4d4e2a3aab713288 | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 6.6 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 6.6 | Unavailable | None listed |
| 6.6.153 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.105 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.18.44 | unaffected | semver | Unavailable | 6.18.* | None listed |
| 7.1.6 | unaffected | semver | Unavailable | 7.1.* | None listed |
| 7.2 | unaffected | original_commit_for_fix | Unavailable | * | None listed |