CVE-2026-68451

HIGHPre-NVD 7.87.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-13. A secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 4 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 7.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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

s390/zcrypt: Validate length for CCA ECC private key requests

cca_ecc2protkey() derives the copy length for the CPRB parameter block directly from the length field in the key token. Reject the request early if the token length exceeds the available space in the parameter block.

CVSS v3
7.8
EG Score
7.8HIGHmedium confidence
EG Risk
35
EG Risk 35/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity78% × 45%
Impact severity (EG Severity): CVSS 7.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.1% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.1%
EPSS %ILE
2nd
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (7.8): severity, escalated by confirmed exploitation. This CVE's 7.8 is its impact severity (EG Severity), not escalated.

EG Severity
7.8 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.1% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-19). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 13, 2026

Last Modified

October 19, 2026

Advisory Details (5)

Auto-updated Aug 14, 2026
Patch available.
Web page

s390/zcrypt: Validate length for CCA ECC private key requests - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ecc3b8691c1935f9f3e4eb964ab11e40fdec17f5
Web page

s390/zcrypt: Validate length for CCA ECC private key requests - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/dd25bd9b0f36849808bd7625dcc59dd4c1aeef3e
Web page

s390/zcrypt: Validate length for CCA ECC private key requests - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a9ae0f6dd45c3ccc1d69363f7aea8af179122730
Web page

s390/zcrypt: Validate length for CCA ECC private key requests - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/8fa3e9435a13c335efb63fb4f4e77531a0031159
Web page

s390/zcrypt: Validate length for CCA ECC private key requests - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/013a4484f061a2b41f052e25c0015203287e63f1

Vendor Advisories for CVE-2026-68451(2)

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

Patch Availability(7)

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

(4 across 3 ecosystems)
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.106-1 ... 6.1.99-1 (56 versions)
  • every version up to 6.1.187-1: fixed in 6.1.187-1
—
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 (165 versions)
  • every version up to 7.1.8-1: fixed in 7.1.8-1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(7)

Data Freshness Timeline

(refreshed 21× in last 7d / 85× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 231 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 131 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-19 22:30 UTCEG score recompute
  2. 2026-10-19 22:30 UTCVendor advisory
  3. 2026-10-19 22:30 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  4. 2026-10-19 21:24 UTCEG score recompute
  5. 2026-10-19 21:24 UTCVendor advisory
  6. 2026-10-19 21:24 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  7. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  8. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  9. 2026-10-18 03:19 UTCEG score recompute
  10. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  11. 2026-10-16 17:30 UTCEG score recompute
  12. 2026-10-16 17:30 UTCVendor advisory
  13. 2026-10-16 17:30 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  14. 2026-10-16 16:43 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  15. 2026-10-16 16:05 UTCEG score recompute
  16. 2026-10-16 16:05 UTCVendor advisory
  17. 2026-10-16 16:05 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  18. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  19. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  20. 2026-10-13 10:06 UTCEG score recompute
  21. 2026-10-13 10:06 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  22. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  23. 2026-10-12 15:45 UTCEG score recompute
  24. 2026-10-11 19:30 UTCEG score recompute
  25. 2026-10-11 16:45 UTCEG score recompute
Show 75 more
  1. 2026-10-11 14:06 UTCEG score recompute
  2. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  3. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  4. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  5. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  6. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  7. 2026-10-07 01:20 UTCEG score recompute
  8. 2026-10-07 01:20 UTCVendor advisory
  9. 2026-10-07 01:20 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  10. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  11. 2026-10-06 13:27 UTCEG score recompute
  12. 2026-10-06 13:27 UTCVendor advisory
  13. 2026-10-06 13:27 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  14. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  15. 2026-10-05 14:39 UTCEG score recompute
  16. 2026-10-05 14:39 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  17. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  18. 2026-10-04 22:22 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  19. 2026-10-04 06:48 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  20. 2026-10-03 19:50 UTCEG score recompute
  21. 2026-10-03 19:49 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  22. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  23. 2026-10-02 18:33 UTCEG score recompute
  24. 2026-10-02 18:33 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  25. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  26. 2026-10-02 07:35 UTCEG score recompute
  27. 2026-10-02 07:35 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  28. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  29. 2026-10-01 08:46 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  30. 2026-09-30 21:48 UTCEG score recompute
  31. 2026-09-30 21:48 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  32. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  33. 2026-09-29 04:07 UTCEG score recompute
  34. 2026-09-29 04:07 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  35. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  36. 2026-09-28 12:17 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  37. 2026-09-28 00:50 UTCEG score recompute
  38. 2026-09-28 00:50 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  39. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  40. 2026-09-27 09:45 UTCEG score recompute
  41. 2026-09-27 09:45 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  42. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  43. 2026-09-25 03:34 UTCEG score recompute
  44. 2026-09-25 03:34 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  45. 2026-09-24 08:05 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  46. 2026-09-23 20:50 UTCEG score recompute
  47. 2026-09-23 20:50 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  48. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  49. 2026-09-23 08:02 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  50. 2026-09-22 21:01 UTCEG score recompute
  51. 2026-09-22 21:01 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  52. 2026-09-22 07:45 UTCEG score recompute
  53. 2026-09-22 07:44 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  54. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  55. 2026-09-21 20:46 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  56. 2026-09-21 09:32 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  57. 2026-09-20 21:11 UTCEG score recompute
  58. 2026-09-20 21:11 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  59. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  60. 2026-09-20 10:09 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  61. 2026-09-19 23:10 UTCEG score recompute
  62. 2026-09-19 23:10 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  63. 2026-09-19 11:13 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  64. 2026-09-18 22:26 UTCEG score recompute
  65. 2026-09-18 22:26 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  66. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  67. 2026-09-18 11:28 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  68. 2026-09-18 00:29 UTCEG score recompute
  69. 2026-09-18 00:29 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  70. 2026-09-17 12:05 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  71. 2026-09-17 00:03 UTCEG score recompute
  72. 2026-09-17 00:03 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  73. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  74. 2026-09-16 07:08 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8
  75. 2026-09-15 20:09 UTCGHSA enrichmentGHSA-4fv3-cqpg-5v3h · GitHub severity HIGH · GitHub CVSS 7.8

Frequently asked(5)

What is CVE-2026-68451?
CVE-2026-68451 is a high-severity vulnerability; its CVE record was published on August 13, 2026. In the Linux kernel, the following vulnerability has been resolved: s390/zcrypt: Validate length for CCA ECC private key requests cca_ecc2protkey() derives the copy length for the CPRB parameter block directly from the length field in the key token. Reject the request early if the token length…
When was the CVE record for CVE-2026-68451 published?
The CVE record for CVE-2026-68451 was published on August 13, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 19, 2026; the record at its source may have been updated since.
Is CVE-2026-68451 actively exploited?
CVE-2026-68451 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (2nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-68451?
CVE-2026-68451 has a CVSS base score of 7.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-68451?
A fix for CVE-2026-68451 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-68451 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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