CVE-2026-68166

UNRATEDCVSS · not yet scoredTrending — 4 sources updated this week
—
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • No CVSS published and no exploitation signals yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS v2: —Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
—
EchelonGraph score
Not yet assessedNo source has published severity data for this CVE yet — no CVSS score from NVD or a CNA, no GitHub advisory, and it is not in CISA KEV. This is not a rating of zero; we cannot assess it yet.
EG Score
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EG Risk
—
EPSS PROB
0.2%
EPSS %ILE
9th
KEV
Not listed

Published

August 10, 2026

Last Modified

August 23, 2026

References (5)

Vendor Advisories for CVE-2026-68166(6)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(4)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatkernel-0:6.12.0-55.105.1.el10_02026-09-21redhat
redhatkernel-0:5.14.0-570.141.1.el9_62026-09-16redhat
redhatkernel-0:5.14.0-687.44.1.el9_82026-09-04redhat
redhatkernel-0:6.12.0-211.50.1.el10_22026-09-01redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux-6.126.12.100-1~deb12u1, 6.12.101-1~deb12u1
  • every version up to 6.12.107-1~deb12u1: fixed in 6.12.107-1~deb12u1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 6.12.96-1 (33 versions)
  • every version up to 6.12.105-1: fixed in 6.12.105-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 7.1~rc7-1~exp1 (161 versions)
  • every version up to 7.1.6-1: fixed in 7.1.6-1
—

Data Freshness Timeline

(refreshed 11× in last 7d / 38× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-04 23:22 UTCEPSS rescore
  2. 2026-10-04 05:26 UTCVendor advisory
  3. 2026-10-04 05:26 UTCGHSA enrichment
  4. 2026-10-03 14:26 UTCEPSS rescore
  5. 2026-10-02 17:56 UTCEPSS rescore
  6. 2026-10-01 19:50 UTCEPSS rescore
  7. 2026-09-30 22:42 UTCEG score recompute
  8. 2026-09-30 22:42 UTCVendor advisory
  9. 2026-09-30 22:42 UTCGHSA enrichment
  10. 2026-09-30 15:03 UTCEPSS rescore
  11. 2026-09-28 13:52 UTCEPSS rescore
  12. 2026-09-27 16:57 UTCVendor advisory
  13. 2026-09-27 16:57 UTCGHSA enrichment
  14. 2026-09-27 13:48 UTCEPSS rescore
  15. 2026-09-26 15:59 UTCEPSS rescore
  16. 2026-09-23 17:54 UTCEPSS rescore
  17. 2026-09-22 23:54 UTCVendor advisory
  18. 2026-09-22 23:54 UTCGHSA enrichment
  19. 2026-09-20 20:16 UTCEPSS rescore
  20. 2026-09-20 00:01 UTCVendor advisory
  21. 2026-09-20 00:01 UTCGHSA enrichment
  22. 2026-09-18 19:28 UTCEPSS rescore
  23. 2026-09-17 00:49 UTCVendor advisory
  24. 2026-09-17 00:49 UTCGHSA enrichment
  25. 2026-09-16 14:08 UTCEPSS rescore
Show 52 more
  1. 2026-09-16 05:15 UTCEPSS rescore
  2. 2026-09-13 16:24 UTCVendor advisory
  3. 2026-09-13 16:24 UTCGHSA enrichment
  4. 2026-09-11 14:53 UTCEPSS rescore
  5. 2026-09-11 09:37 UTCEPSS rescore
  6. 2026-09-10 17:11 UTCVendor advisory
  7. 2026-09-10 17:11 UTCGHSA enrichment
  8. 2026-09-08 22:01 UTCEPSS rescore
  9. 2026-09-07 17:26 UTCVendor advisory
  10. 2026-09-07 17:26 UTCGHSA enrichment
  11. 2026-09-07 16:01 UTCEPSS rescore
  12. 2026-09-06 13:47 UTCEPSS rescore
  13. 2026-09-05 15:31 UTCEPSS rescore
  14. 2026-09-04 15:59 UTCVendor advisory
  15. 2026-09-04 15:59 UTCGHSA enrichment
  16. 2026-09-04 05:07 UTCEPSS rescore
  17. 2026-09-02 14:12 UTCEPSS rescore
  18. 2026-09-01 16:45 UTCGHSA enrichment
  19. 2026-09-01 13:54 UTCEPSS rescore
  20. 2026-09-01 04:40 UTCEPSS rescore
  21. 2026-08-30 19:17 UTCEPSS rescore
  22. 2026-08-30 01:22 UTCEPSS rescore
  23. 2026-08-29 15:30 UTCGHSA enrichment
  24. 2026-08-28 21:42 UTCEPSS rescore
  25. 2026-08-26 14:47 UTCEPSS rescore
  26. 2026-08-26 12:41 UTCGHSA enrichment
  27. 2026-08-25 13:49 UTCEPSS rescore
  28. 2026-08-23 13:21 UTCGHSA enrichment
  29. 2026-08-23 13:19 UTCNVD update
  30. 2026-08-23 13:08 UTCGHSA enrichment
  31. 2026-08-23 13:05 UTCMITRE cvelistV5
  32. 2026-08-23 04:05 UTCGHSA enrichment
  33. 2026-08-21 23:49 UTCEPSS rescore
  34. 2026-08-20 22:56 UTCEPSS rescore
  35. 2026-08-20 04:53 UTCGHSA enrichment
  36. 2026-08-19 17:04 UTCEPSS rescore
  37. 2026-08-18 13:48 UTCEPSS rescore
  38. 2026-08-17 13:47 UTCEPSS rescore
  39. 2026-08-17 05:40 UTCGHSA enrichment
  40. 2026-08-17 05:26 UTCNVD update
  41. 2026-08-17 05:10 UTCGHSA enrichment
  42. 2026-08-17 05:05 UTCMITRE cvelistV5
  43. 2026-08-16 14:56 UTCEPSS rescore
  44. 2026-08-16 11:52 UTCGHSA enrichment
  45. 2026-08-15 01:30 UTCEPSS rescore
  46. 2026-08-13 22:00 UTCEPSS rescore
  47. 2026-08-13 12:40 UTCEG score recompute
  48. 2026-08-13 12:40 UTCGHSA enrichment
  49. 2026-08-12 13:51 UTCEPSS rescore
  50. 2026-08-10 13:24 UTCNVD update
  51. 2026-08-10 12:20 UTCEG score recompute
  52. 2026-08-10 12:17 UTCMITRE cvelistV5first tracked

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Frequently asked(4)

What is CVE-2026-68166?
CVE-2026-68166 is a publicly disclosed vulnerability published on August 10, 2026. 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…
When was CVE-2026-68166 disclosed?
CVE-2026-68166 was first published on August 10, 2026, with the most recent update on August 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-68166 actively exploited?
CVE-2026-68166 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (9th percentile of EPSS-scored CVEs).
How do I remediate CVE-2026-68166?
A fix for CVE-2026-68166 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-68166 are linked in the Vendor Advisories panel on this page.

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