CVE-2026-43366

HIGHNVD 7.87.8
EchelonGraph scoreMEDIUM confidence

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

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-05-08. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 4 sources updated this week

Also known asEUVD-2026-28672 (ENISA EUVD) · GHSA-g6hq-4292-hhwx (GitHub Security Advisories)Source: ENISA EUVD

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:

io_uring/kbuf: check if target buffer list is still legacy on recycle

There's a gap between when the buffer was grabbed and when it potentially gets recycled, where if the list is empty, someone could've upgraded it to a ring provided type. This can happen if the request is forced via io-wq. The legacy recycling is missing checking if the buffer_list still exists, and if it's of the correct type. Add those checks.

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 2026-10-27). 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, and whom BOD 26-04 binds: 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.

The score's inputs: 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

May 8, 2026

Last Modified

October 19, 2026

Advisory Details (6)

Auto-updated May 11, 2026
Patch available.
Web page

io_uring/kbuf: check if target buffer list is still legacy on recycle - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f3fb54e7a8b4aadcc2836ee463eec8c88709b8aa
Web page

io_uring/kbuf: check if target buffer list is still legacy on recycle - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c2c185be5c85d37215397c8e8781abf0a69bec1f
Web page

io_uring/kbuf: check if target buffer list is still legacy on recycle - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a7b33671e418fca507feebd1d56e7f4952a4b25c
Web page

io_uring/kbuf: check if target buffer list is still legacy on recycle - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/97b57f69fee1b61b41acbf37e7720cac9d389fa4
Web page

io_uring/kbuf: check if target buffer list is still legacy on recycle - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/50ad880db3013c6fee0ef13781762a39e2e7ef83
Web page

io_uring/kbuf: check if target buffer list is still legacy on recycle - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/439a6728ec4641ffad1ca796622c19bc525e570f

Vendor Advisories for CVE-2026-43366(1)

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

Patch Availability(15)

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
linux6.1.106-1 ... 6.1.99-1 (48 versions)
  • every version up to 6.1.170-1: fixed in 6.1.170-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.38-1 ... 6.12.85-1~bpo12+1 (17 versions)
  • every version up to 6.12.85-1: fixed in 6.12.85-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 6.19~rc8-1~exp1 (123 versions)
  • every version up to 6.19.10-1: fixed in 6.19.10-1
—

Weakness Classification(1)

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

All Vendor Advisories

(14)

Data Freshness Timeline

(refreshed 10× in last 7d / 49× 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 278 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 178 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-02 16:44 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  2. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  3. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  4. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  5. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  6. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  7. 2026-10-27 18:39 UTCEG score recompute
  8. 2026-10-27 18:39 UTCVendor advisory
  9. 2026-10-27 18:39 UTCGHSA enrichmentGHSA-g6hq-4292-hhwx · GitHub severity HIGH · GitHub CVSS 7.8
  10. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  11. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  12. 2026-10-25 14:28 UTCEG score recompute
  13. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  14. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  15. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  16. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  17. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  18. 2026-10-19 20:27 UTCVendor advisory
  19. 2026-10-19 20:26 UTCGHSA enrichmentGHSA-g6hq-4292-hhwx · GitHub severity HIGH · GitHub CVSS 7.8
  20. 2026-10-19 19:23 UTCEG score recompute
  21. 2026-10-19 19:23 UTCVendor advisory
  22. 2026-10-19 19:23 UTCGHSA enrichmentGHSA-g6hq-4292-hhwx · GitHub severity HIGH · GitHub CVSS 7.8
  23. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  24. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  25. 2026-10-18 03:40 UTCEG score recompute
Show 75 more
  1. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  2. 2026-10-16 16:59 UTCEG score recompute
  3. 2026-10-16 16:59 UTCVendor advisory
  4. 2026-10-16 16:59 UTCGHSA enrichmentGHSA-g6hq-4292-hhwx · GitHub severity HIGH · GitHub CVSS 7.8
  5. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  6. 2026-10-16 15:33 UTCEG score recompute
  7. 2026-10-16 15:33 UTCVendor advisory
  8. 2026-10-16 15:32 UTCGHSA enrichmentGHSA-g6hq-4292-hhwx · GitHub severity HIGH · GitHub CVSS 7.8
  9. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  10. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  11. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  12. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  13. 2026-10-12 16:06 UTCEG score recompute
  14. 2026-10-11 19:48 UTCEG score recompute
  15. 2026-10-11 17:02 UTCEG score recompute
  16. 2026-10-11 14:28 UTCEG score recompute
  17. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  18. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  19. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  20. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  21. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  22. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  23. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  24. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  25. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  26. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  27. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  28. 2026-09-30 07:58 UTCOSV refresh
  29. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  30. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  31. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  32. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  33. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  34. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  35. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  36. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  37. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  38. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  39. 2026-09-11 14:23 UTCOSV refresh
  40. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  41. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  42. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  43. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  44. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  45. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  46. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  47. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  48. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  49. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  50. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  51. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  52. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  53. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  54. 2026-08-23 19:12 UTCEG score recompute
  55. 2026-08-23 19:12 UTCVendor advisory
  56. 2026-08-23 19:12 UTCGHSA enrichmentGHSA-g6hq-4292-hhwx · GitHub severity HIGH · GitHub CVSS 7.8
  57. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  58. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  59. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  60. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  61. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  62. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  63. 2026-08-17 11:53 UTCEG score recompute
  64. 2026-08-17 11:53 UTCVendor advisory
  65. 2026-08-17 11:53 UTCGHSA enrichmentGHSA-g6hq-4292-hhwx · GitHub severity HIGH · GitHub CVSS 7.8
  66. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  67. 2026-08-16 04:36 UTCEG score recompute
  68. 2026-08-16 04:36 UTCVendor advisory
  69. 2026-08-16 04:36 UTCGHSA enrichmentGHSA-g6hq-4292-hhwx · GitHub severity HIGH · GitHub CVSS 7.8
  70. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  71. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  72. 2026-08-14 15:16 UTCVendor advisory
  73. 2026-08-14 15:16 UTCGHSA enrichmentGHSA-g6hq-4292-hhwx · GitHub severity HIGH · GitHub CVSS 7.8
  74. 2026-08-14 03:10 UTCEG score recompute
  75. 2026-08-14 03:10 UTCVendor advisory

Frequently asked(5)

What is CVE-2026-43366?
CVE-2026-43366 is a high-severity vulnerability; its CVE record was published on May 8, 2026. In the Linux kernel, the following vulnerability has been resolved: io_uring/kbuf: check if target buffer list is still legacy on recycle There's a gap between when the buffer was grabbed and when it potentially gets recycled, where if the list is empty, someone could've upgraded it to a ring…
When was the CVE record for CVE-2026-43366 published?
The CVE record for CVE-2026-43366 was published on May 8, 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-2026-43366 actively exploited?
CVE-2026-43366 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-2026-43366?
CVE-2026-43366 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-43366?
A fix for CVE-2026-43366 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-43366 are linked in the Vendor Advisories panel on this page.

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