CVE-2026-80551

CRITICALPre-NVD 9.39.3
EchelonGraph scoreMEDIUM confidence

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

Score 9.3 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-27. A secondary CVSS source baseline 9.3; 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

Also known asEUVD-2026-66466 (ENISA EUVD) · GHSA-p29x-7599-2m4p (GitHub Security Advisories)Source: ENISA EUVD

9.3EG
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: 0.2%CVSS: 9.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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

s390/vfio_ccw: Ensure first IDAW remains constant

The first IDAW in a list does not need to be on a 2K/4K boundary like all others, and so is read separately to accurately calculate the size of the buffer needed to read the full IDAL.

Verify that the address found in the first IDAW is unchanged between reads, to ensure a consistent set of IDAWs being worked with.

CVSS v3
9.3
EG Score
9.3CRITICALmedium confidence
EG Risk
42
EG Risk 42/100

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)
Severity93% × 45%
Impact severity (EG Severity): CVSS 9.3 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.2% × 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
0.2%
EPSS %ILE
9th
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 (9.3): severity, escalated by confirmed exploitation. This CVE's 9.3 is its impact severity (EG Severity), not escalated.

EG Severity
9.3 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-29). 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 26, 2026

Last Modified

October 30, 2026

Advisory Details (5)

Auto-updated Oct 7, 2026
Patch available.
Web page

s390/vfio_ccw: Ensure first IDAW remains constant - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/fc59e9482117ebdccd6dc7fa8082f8b980fd021e
Web page

s390/vfio_ccw: Ensure first IDAW remains constant - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/565bef268d75bf7df665bce6923a88cd0eb74592
Web page

s390/vfio_ccw: Ensure first IDAW remains constant - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/460b977a4e71cc319fdadf91c193ec3beaa57263
Web page

s390/vfio_ccw: Ensure first IDAW remains constant - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0d46c2565f173bcddcdcaf44a4f69789a20535e2
Web page

s390/vfio_ccw: Ensure first IDAW remains constant - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/08ef2a82115690d6e229615872ac1731af732497

Vendor Advisories for CVE-2026-80551(2)

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

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-tools-nvidia-tegra-rt-6.8 (6.8.0-1036.39) @ noble2026-10-30ubuntu

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 ... 7.2~rc7-1~exp1 (358 versions)
  • every version on: no fix on record
—
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 (169 versions)
  • every version up to 7.1.10-1: fixed in 7.1.10-1
—

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 32× in last 7d / 185× 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 489 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 389 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  2. 2026-10-30 13:27 UTCEG score recompute
  3. 2026-10-30 13:27 UTCVendor advisory
  4. 2026-10-30 13:27 UTCGHSA enrichmentGHSA-p29x-7599-2m4p · GitHub severity CRITICAL · GitHub CVSS 9.3
  5. 2026-10-30 12:42 UTCEG score recompute
  6. 2026-10-30 12:42 UTCVendor advisory
  7. 2026-10-30 12:42 UTCGHSA enrichmentGHSA-p29x-7599-2m4p · GitHub severity CRITICAL · GitHub CVSS 9.3
  8. 2026-10-30 03:59 UTCEG score recompute
  9. 2026-10-30 03:59 UTCVendor advisory
  10. 2026-10-30 03:59 UTCGHSA enrichmentGHSA-p29x-7599-2m4p · GitHub severity CRITICAL · GitHub CVSS 9.3
  11. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  12. 2026-10-29 05:26 UTCEG score recompute
  13. 2026-10-29 05:26 UTCVendor advisory
  14. 2026-10-29 05:26 UTCGHSA enrichmentGHSA-p29x-7599-2m4p · GitHub severity CRITICAL · GitHub CVSS 9.3
  15. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  16. 2026-10-28 06:53 UTCEG score recompute
  17. 2026-10-28 06:53 UTCVendor advisory
  18. 2026-10-28 06:53 UTCGHSA enrichmentGHSA-p29x-7599-2m4p · GitHub severity CRITICAL · GitHub CVSS 9.3
  19. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  20. 2026-10-27 08:20 UTCEG score recompute
  21. 2026-10-27 08:20 UTCVendor advisory
  22. 2026-10-27 08:19 UTCGHSA enrichmentGHSA-p29x-7599-2m4p · GitHub severity CRITICAL · GitHub CVSS 9.3
  23. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  24. 2026-10-26 07:31 UTCEG score recompute
  25. 2026-10-26 07:31 UTCVendor advisory
Show 75 more
  1. 2026-10-26 07:31 UTCGHSA enrichmentGHSA-p29x-7599-2m4p · GitHub severity CRITICAL · GitHub CVSS 9.3
  2. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  3. 2026-10-25 13:59 UTCEG score recompute
  4. 2026-10-25 08:58 UTCEG score recompute
  5. 2026-10-25 08:58 UTCVendor advisory
  6. 2026-10-25 08:58 UTCGHSA enrichmentGHSA-p29x-7599-2m4p · GitHub severity CRITICAL · GitHub CVSS 9.3
  7. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  8. 2026-10-24 10:25 UTCEG score recompute
  9. 2026-10-24 10:25 UTCVendor advisory
  10. 2026-10-24 10:25 UTCGHSA enrichmentGHSA-p29x-7599-2m4p · GitHub severity CRITICAL · GitHub CVSS 9.3
  11. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  12. 2026-10-23 11:51 UTCEG score recompute
  13. 2026-10-23 11:51 UTCVendor advisory
  14. 2026-10-23 11:51 UTCGHSA enrichmentGHSA-p29x-7599-2m4p · GitHub severity CRITICAL · GitHub CVSS 9.3
  15. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  16. 2026-10-22 13:17 UTCEG score recompute
  17. 2026-10-22 13:17 UTCVendor advisory
  18. 2026-10-22 13:16 UTCGHSA enrichmentGHSA-p29x-7599-2m4p · GitHub severity CRITICAL · GitHub CVSS 9.3
  19. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  20. 2026-10-21 14:42 UTCEG score recompute
  21. 2026-10-21 14:42 UTCVendor advisory
  22. 2026-10-21 14:42 UTCGHSA enrichmentGHSA-p29x-7599-2m4p · GitHub severity CRITICAL · GitHub CVSS 9.3
  23. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  24. 2026-10-20 15:29 UTCEG score recompute
  25. 2026-10-20 15:29 UTCGHSA enrichmentGHSA-p29x-7599-2m4p · GitHub severity CRITICAL · GitHub CVSS 9.3
  26. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  27. 2026-10-19 16:11 UTCVendor advisory
  28. 2026-10-19 16:11 UTCGHSA enrichmentGHSA-p29x-7599-2m4p · GitHub severity CRITICAL · GitHub CVSS 9.3
  29. 2026-10-18 17:36 UTCEG score recompute
  30. 2026-10-18 17:36 UTCVendor advisory
  31. 2026-10-18 17:36 UTCGHSA enrichmentGHSA-p29x-7599-2m4p · GitHub severity CRITICAL · GitHub CVSS 9.3
  32. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  33. 2026-10-18 03:10 UTCEG score recompute
  34. 2026-10-17 19:01 UTCEG score recompute
  35. 2026-10-17 19:01 UTCVendor advisory
  36. 2026-10-17 19:00 UTCGHSA enrichmentGHSA-p29x-7599-2m4p · GitHub severity CRITICAL · GitHub CVSS 9.3
  37. 2026-10-16 20:26 UTCEG score recompute
  38. 2026-10-16 20:26 UTCVendor advisory
  39. 2026-10-16 20:26 UTCGHSA enrichmentGHSA-p29x-7599-2m4p · GitHub severity CRITICAL · GitHub CVSS 9.3
  40. 2026-10-16 19:34 UTCEG score recompute
  41. 2026-10-16 19:34 UTCGHSA enrichmentGHSA-p29x-7599-2m4p · GitHub severity CRITICAL · GitHub CVSS 9.3
  42. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  43. 2026-10-16 12:23 UTCEG score recompute
  44. 2026-10-16 12:22 UTCGHSA enrichmentGHSA-p29x-7599-2m4p · GitHub severity CRITICAL · GitHub CVSS 9.3
  45. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  46. 2026-10-15 13:48 UTCEG score recompute
  47. 2026-10-15 13:47 UTCGHSA enrichmentGHSA-p29x-7599-2m4p · GitHub severity CRITICAL · GitHub CVSS 9.3
  48. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  49. 2026-10-14 08:43 UTCEG score recompute
  50. 2026-10-14 08:43 UTCVendor advisory
  51. 2026-10-14 08:43 UTCGHSA enrichmentGHSA-p29x-7599-2m4p · GitHub severity CRITICAL · GitHub CVSS 9.3
  52. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  53. 2026-10-13 03:57 UTCEG score recompute
  54. 2026-10-13 03:57 UTCVendor advisory
  55. 2026-10-13 03:57 UTCGHSA enrichmentGHSA-p29x-7599-2m4p · GitHub severity CRITICAL · GitHub CVSS 9.3
  56. 2026-10-12 14:57 UTCEG score recompute
  57. 2026-10-12 05:23 UTCVendor advisory
  58. 2026-10-12 05:23 UTCGHSA enrichmentGHSA-p29x-7599-2m4p · GitHub severity CRITICAL · GitHub CVSS 9.3
  59. 2026-10-11 19:21 UTCEG score recompute
  60. 2026-10-11 16:37 UTCEG score recompute
  61. 2026-10-11 13:55 UTCEG score recompute
  62. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  63. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  64. 2026-10-10 15:16 UTCGHSA enrichmentGHSA-p29x-7599-2m4p · GitHub severity CRITICAL · GitHub CVSS 9.3
  65. 2026-10-10 11:05 UTCVendor advisory
  66. 2026-10-10 11:05 UTCGHSA enrichmentGHSA-p29x-7599-2m4p · GitHub severity CRITICAL · GitHub CVSS 9.3
  67. 2026-10-10 06:33 UTCEG score recompute
  68. 2026-10-10 06:33 UTCVendor advisory
  69. 2026-10-10 06:33 UTCGHSA enrichmentGHSA-p29x-7599-2m4p · GitHub severity CRITICAL · GitHub CVSS 9.3
  70. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  71. 2026-10-09 07:20 UTCVendor advisory
  72. 2026-10-09 07:20 UTCGHSA enrichmentGHSA-p29x-7599-2m4p · GitHub severity CRITICAL · GitHub CVSS 9.3
  73. 2026-10-09 03:24 UTCEG score recompute
  74. 2026-10-09 03:24 UTCVendor advisory
  75. 2026-10-09 03:24 UTCGHSA enrichmentGHSA-p29x-7599-2m4p · GitHub severity CRITICAL · GitHub CVSS 9.3

Frequently asked(5)

What is CVE-2026-80551?
CVE-2026-80551 is a critical-severity vulnerability; its CVE record was published on August 26, 2026. In the Linux kernel, the following vulnerability has been resolved: s390/vfio_ccw: Ensure first IDAW remains constant The first IDAW in a list does not need to be on a 2K/4K boundary like all others, and so is read separately to accurately calculate the size of the buffer needed to read the full…
When was the CVE record for CVE-2026-80551 published?
The CVE record for CVE-2026-80551 was published on August 26, 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 30, 2026; the record at its source may have been updated since.
Is CVE-2026-80551 actively exploited?
CVE-2026-80551 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).
What is the CVSS score of CVE-2026-80551?
CVE-2026-80551 has a CVSS base score of 9.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-80551?
A fix for CVE-2026-80551 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-80551 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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