CVE-2026-64559

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-29. a secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: 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:

s390/pkey: Check length in PKEY_VERIFYPROTK ioctl

Explicitly check the buffer length request structure provided by user-space and fail, if it exceeds the buffer size.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
2%
KEV
Not listed

Published

July 29, 2026

Last Modified

August 17, 2026

Advisory Details (4)

Auto-updated Jul 30, 2026
No patch confirmed yet.
generic

s390/pkey: Check length in PKEY_VERIFYPROTK ioctl - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b3d4ab2d7df9426f7f1d3671d7e2108f2ca6e970
generic

s390/pkey: Check length in PKEY_VERIFYPROTK ioctl - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/7e7e03848c918aa0acad5ffd75d929e3afec1554
generic

s390/pkey: Check length in PKEY_VERIFYPROTK ioctl - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/693bf91d4db134f9b1c2840c8e287eee3d993bac
generic

s390/pkey: Check length in PKEY_VERIFYPROTK ioctl - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0a9e34ccbe772b8f321388cdbdf4f22b94e513e7

Vendor Advisories for CVE-2026-64559(1)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux-6.12—6.12.100-1~deb12u1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.96-1 (31 versions)6.12.100-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.1~rc7-1~exp1 (157 versions)7.1.5-1—

Data Freshness Timeline

(refreshed 16× in last 7d / 104× 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.

Showing the most recent 100 of 116 total refreshes for this CVE.

  1. 2026-08-30 01:22 UTCEPSS rescore
  2. 2026-08-29 23:17 UTCEG score recompute
  3. 2026-08-29 23:17 UTCGHSA enrichment
  4. 2026-08-28 21:42 UTCEPSS rescore
  5. 2026-08-27 21:27 UTCEG score recompute
  6. 2026-08-27 21:27 UTCGHSA enrichment
  7. 2026-08-27 09:27 UTCGHSA enrichment
  8. 2026-08-26 20:13 UTCGHSA enrichment
  9. 2026-08-26 08:09 UTCGHSA enrichment
  10. 2026-08-25 20:07 UTCGHSA enrichment
  11. 2026-08-25 08:03 UTCGHSA enrichment
  12. 2026-08-24 19:59 UTCEG score recompute
  13. 2026-08-24 19:59 UTCGHSA enrichment
  14. 2026-08-24 07:59 UTCGHSA enrichment
  15. 2026-08-23 19:57 UTCGHSA enrichment
  16. 2026-08-23 07:57 UTCGHSA enrichment
  17. 2026-08-22 19:57 UTCGHSA enrichment
  18. 2026-08-22 07:57 UTCGHSA enrichment
  19. 2026-08-21 19:56 UTCGHSA enrichment
  20. 2026-08-21 07:56 UTCEG score recompute
  21. 2026-08-21 07:56 UTCGHSA enrichment
  22. 2026-08-20 22:55 UTCEPSS rescore
  23. 2026-08-20 19:56 UTCGHSA enrichment
  24. 2026-08-20 07:55 UTCGHSA enrichment
  25. 2026-08-19 19:55 UTCEG score recompute
Show 75 more
  1. 2026-08-19 19:55 UTCGHSA enrichment
  2. 2026-08-19 17:04 UTCEPSS rescore
  3. 2026-08-19 07:54 UTCGHSA enrichment
  4. 2026-08-18 19:54 UTCEG score recompute
  5. 2026-08-18 19:54 UTCGHSA enrichment
  6. 2026-08-18 13:48 UTCEPSS rescore
  7. 2026-08-18 07:54 UTCGHSA enrichment
  8. 2026-08-17 19:54 UTCEG score recompute
  9. 2026-08-17 19:54 UTCGHSA enrichment
  10. 2026-08-17 13:47 UTCEPSS rescore
  11. 2026-08-17 05:42 UTCEG score recompute
  12. 2026-08-17 05:42 UTCGHSA enrichment
  13. 2026-08-17 05:14 UTCGHSA enrichment
  14. 2026-08-17 01:14 UTCEG score recompute
  15. 2026-08-17 01:14 UTCGHSA enrichment
  16. 2026-08-16 14:56 UTCEPSS rescore
  17. 2026-08-16 13:13 UTCEG score recompute
  18. 2026-08-16 13:13 UTCGHSA enrichment
  19. 2026-08-16 01:13 UTCGHSA enrichment
  20. 2026-08-15 13:13 UTCEG score recompute
  21. 2026-08-15 13:13 UTCGHSA enrichment
  22. 2026-08-15 01:30 UTCEPSS rescore
  23. 2026-08-15 01:12 UTCGHSA enrichment
  24. 2026-08-14 13:12 UTCGHSA enrichment
  25. 2026-08-14 01:12 UTCEG score recompute
  26. 2026-08-14 01:12 UTCGHSA enrichment
  27. 2026-08-13 22:00 UTCEPSS rescore
  28. 2026-08-13 13:12 UTCGHSA enrichment
  29. 2026-08-13 01:12 UTCEG score recompute
  30. 2026-08-13 01:12 UTCGHSA enrichment
  31. 2026-08-12 13:51 UTCEPSS rescore
  32. 2026-08-12 13:12 UTCGHSA enrichment
  33. 2026-08-12 01:11 UTCEG score recompute
  34. 2026-08-12 01:11 UTCGHSA enrichment
  35. 2026-08-11 13:11 UTCGHSA enrichment
  36. 2026-08-11 01:11 UTCEG score recompute
  37. 2026-08-11 01:11 UTCGHSA enrichment
  38. 2026-08-11 00:00 UTCEPSS rescore
  39. 2026-08-10 13:11 UTCGHSA enrichment
  40. 2026-08-10 01:11 UTCEG score recompute
  41. 2026-08-10 01:11 UTCGHSA enrichment
  42. 2026-08-09 13:47 UTCEPSS rescore
  43. 2026-08-09 13:12 UTCGHSA enrichment
  44. 2026-08-09 01:12 UTCEG score recompute
  45. 2026-08-09 01:12 UTCGHSA enrichment
  46. 2026-08-08 16:37 UTCEPSS rescore
  47. 2026-08-08 13:12 UTCGHSA enrichment
  48. 2026-08-08 01:11 UTCEG score recompute
  49. 2026-08-08 01:11 UTCGHSA enrichment
  50. 2026-08-07 13:11 UTCGHSA enrichment
  51. 2026-08-07 01:11 UTCEG score recompute
  52. 2026-08-07 01:11 UTCGHSA enrichment
  53. 2026-08-06 13:47 UTCEPSS rescore
  54. 2026-08-06 13:10 UTCGHSA enrichment
  55. 2026-08-06 01:10 UTCEG score recompute
  56. 2026-08-06 01:10 UTCGHSA enrichment
  57. 2026-08-05 19:17 UTCEPSS rescore
  58. 2026-08-05 19:17 UTCEPSS rescore
  59. 2026-08-05 13:10 UTCEG score recompute
  60. 2026-08-05 13:10 UTCGHSA enrichment
  61. 2026-08-05 07:02 UTCGHSA enrichment
  62. 2026-08-04 19:02 UTCEG score recompute
  63. 2026-08-04 19:02 UTCGHSA enrichment
  64. 2026-08-04 15:10 UTCEPSS rescore
  65. 2026-08-04 10:39 UTCEPSS rescore
  66. 2026-08-04 07:02 UTCGHSA enrichment
  67. 2026-08-03 19:01 UTCEG score recompute
  68. 2026-08-03 19:01 UTCGHSA enrichment
  69. 2026-08-03 10:36 UTCEPSS rescore
  70. 2026-08-03 07:01 UTCGHSA enrichment
  71. 2026-08-02 19:00 UTCGHSA enrichment
  72. 2026-08-02 07:00 UTCEG score recompute
  73. 2026-08-02 07:00 UTCGHSA enrichment
  74. 2026-08-02 02:27 UTCEPSS rescore
  75. 2026-08-01 18:59 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-64559?
CVE-2026-64559 is a high vulnerability published on July 29, 2026. In the Linux kernel, the following vulnerability has been resolved: s390/pkey: Check length in PKEY_VERIFYPROTK ioctl Explicitly check the buffer length request structure provided by user-space and fail, if it exceeds the buffer size.
When was CVE-2026-64559 disclosed?
CVE-2026-64559 was first published in the National Vulnerability Database on July 29, 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-2026-64559 actively exploited?
CVE-2026-64559 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 98.0% of all scored CVEs.
What is the CVSS score of CVE-2026-64559?
CVE-2026-64559 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-64559?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64559, 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

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