CVE-2026-64285

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-07-25. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

In the Linux kernel, the following vulnerability has been resolved:

KVM: SEV: Pin source page for write when adding CPUID data for SNP guest

When populating a guest_memfd instance with the initial CPUID data for an SNP guest, acquire a writable pin on the source page as KVM will write back the "correct" CPUID information if the userspace provided data is rejected by trusted firmware. Because KVM writes to the source page using a kernel mapping, pinning for read could result in KVM clobbering read-only memory.

Note, well-behaved VMMs are unlikely to be affected, as CPUID information is almost always dynamically generated by userspace, i.e. it's unlikely for the CPUID information to be backed by a read-only mapping.

[sean: rewrite shortlog and changelog, tag for stable@]

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity55% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

July 25, 2026

Last Modified

August 17, 2026

Advisory Details (2)

Auto-updated Aug 13, 2026
No patch confirmed yet.
generic

KVM: SEV: Pin source page for write when adding CPUID data for SNP guest - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f13e900599089b10113ceb36013423f0837c6792
generic

KVM: SEV: Pin source page for write when adding CPUID data for SNP guest - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/dcdb476f5fc5701ec06c23efe3e3529f07ca391e

Vendor Advisories for CVE-2026-64285(1)

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

Affected Packages

(1 across 1 ecosystem)
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.1~rc7-1~exp1 (156 versions)7.1.4-1—

Data Freshness Timeline

(refreshed 16× in last 7d / 62× 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. 2026-08-30 01:22 UTCEPSS rescore
  2. 2026-08-30 00:11 UTCEG score recompute
  3. 2026-08-30 00:11 UTCGHSA enrichment
  4. 2026-08-28 21:42 UTCEPSS rescore
  5. 2026-08-27 21:06 UTCEG score recompute
  6. 2026-08-27 21:06 UTCGHSA enrichment
  7. 2026-08-26 19:50 UTCEG score recompute
  8. 2026-08-26 19:50 UTCGHSA enrichment
  9. 2026-08-26 14:47 UTCEPSS rescore
  10. 2026-08-25 19:45 UTCEG score recompute
  11. 2026-08-25 19:45 UTCGHSA enrichment
  12. 2026-08-25 13:49 UTCEPSS rescore
  13. 2026-08-24 20:52 UTCEG score recompute
  14. 2026-08-24 20:52 UTCGHSA enrichment
  15. 2026-08-23 21:59 UTCEG score recompute
  16. 2026-08-23 21:59 UTCGHSA enrichment
  17. 2026-08-23 00:19 UTCEPSS rescore
  18. 2026-08-22 23:06 UTCGHSA enrichment
  19. 2026-08-22 00:13 UTCEG score recompute
  20. 2026-08-22 00:13 UTCGHSA enrichment
  21. 2026-08-21 23:49 UTCEPSS rescore
  22. 2026-08-21 01:20 UTCEG score recompute
  23. 2026-08-21 01:20 UTCGHSA enrichment
  24. 2026-08-20 22:55 UTCEPSS rescore
  25. 2026-08-20 02:28 UTCEG score recompute
Show 55 more
  1. 2026-08-20 02:28 UTCGHSA enrichment
  2. 2026-08-19 17:04 UTCEPSS rescore
  3. 2026-08-19 03:35 UTCEG score recompute
  4. 2026-08-19 03:35 UTCGHSA enrichment
  5. 2026-08-18 13:48 UTCEPSS rescore
  6. 2026-08-18 04:21 UTCEG score recompute
  7. 2026-08-18 04:21 UTCGHSA enrichment
  8. 2026-08-17 13:47 UTCEPSS rescore
  9. 2026-08-17 05:21 UTCEG score recompute
  10. 2026-08-17 05:21 UTCGHSA enrichment
  11. 2026-08-16 14:56 UTCEPSS rescore
  12. 2026-08-16 11:40 UTCEG score recompute
  13. 2026-08-16 11:40 UTCGHSA enrichment
  14. 2026-08-15 12:48 UTCEG score recompute
  15. 2026-08-15 12:48 UTCGHSA enrichment
  16. 2026-08-15 01:30 UTCEPSS rescore
  17. 2026-08-14 13:55 UTCEG score recompute
  18. 2026-08-14 13:55 UTCGHSA enrichment
  19. 2026-08-13 22:00 UTCEPSS rescore
  20. 2026-08-13 15:02 UTCEG score recompute▲ 5.50
  21. 2026-08-13 15:02 UTCGHSA enrichment
  22. 2026-08-13 15:01 UTCNVD updateCVSS v3 → 5.5 · severity → MEDIUM
  23. 2026-08-12 13:51 UTCEPSS rescore
  24. 2026-08-11 15:55 UTCGHSA enrichment
  25. 2026-08-11 00:00 UTCEPSS rescore
  26. 2026-08-09 13:47 UTCEPSS rescore
  27. 2026-08-08 16:37 UTCEPSS rescore
  28. 2026-08-08 15:45 UTCGHSA enrichment
  29. 2026-08-06 13:47 UTCEPSS rescore
  30. 2026-08-05 19:17 UTCEPSS rescore
  31. 2026-08-05 19:17 UTCEPSS rescore
  32. 2026-08-05 15:34 UTCGHSA enrichment
  33. 2026-08-04 15:10 UTCEPSS rescore
  34. 2026-08-03 10:36 UTCEPSS rescore
  35. 2026-08-02 15:25 UTCGHSA enrichment
  36. 2026-08-02 02:27 UTCEPSS rescore
  37. 2026-08-01 04:16 UTCEPSS rescore
  38. 2026-07-30 16:28 UTCEPSS rescore
  39. 2026-07-30 15:15 UTCEG score recompute
  40. 2026-07-30 15:15 UTCGHSA enrichment
  41. 2026-07-30 01:30 UTCEPSS rescore
  42. 2026-07-30 01:30 UTCEPSS rescore
  43. 2026-07-29 03:03 UTCEG score recompute
  44. 2026-07-29 03:03 UTCGHSA enrichment
  45. 2026-07-28 15:37 UTCEPSS rescore
  46. 2026-07-27 14:14 UTCEPSS rescore
  47. 2026-07-26 14:54 UTCEPSS rescore
  48. 2026-07-26 14:54 UTCEPSS rescore
  49. 2026-07-26 02:53 UTCEG score recompute
  50. 2026-07-26 02:53 UTCGHSA enrichment
  51. 2026-07-25 14:18 UTCEPSS rescore
  52. 2026-07-25 14:18 UTCEPSS rescore
  53. 2026-07-25 10:39 UTCNVD update
  54. 2026-07-25 09:40 UTCEG score recompute
  55. 2026-07-25 09:21 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-64285?
CVE-2026-64285 is a medium vulnerability published on July 25, 2026. In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Pin source page for write when adding CPUID data for SNP guest When populating a guest_memfd instance with the initial CPUID data for an SNP guest, acquire a writable pin on the source page as KVM will write back the…
When was CVE-2026-64285 disclosed?
CVE-2026-64285 was first published in the National Vulnerability Database on July 25, 2026, with the most recent update on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-64285 actively exploited?
CVE-2026-64285 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 96.6% of all scored CVEs.
What is the CVSS score of CVE-2026-64285?
CVE-2026-64285 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-64285?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64285, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-64285

Explore →

Is Your Infrastructure Affected by CVE-2026-64285?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs