CVE-2026-47243

CRITICALPre-NVD 9.29.2
EchelonGraph scoreMEDIUM confidence

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

This critical-severity CVE scores 9.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (9th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Elevated

Also known asEUVD-2026-54710 (ENISA EUVD) · GHSA-2gv2-cffp-j227 (GitHub Security Advisories) · GO-2026-5042 (OSV.dev)Source: ENISA EUVD

9.2EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 9.2Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

Kata Containers is an open source project focusing on a standard implementation of lightweight Virtual Machines (VMs) that perform like containers. Prior to 3.31.0, the runtime-rs standalone virtio-fs path is vulnerable to a guest-root to host-root escape. In this configuration, Kata runs the host virtiofsd as root with --sandbox none --seccomp none, so an attacker with root-equivalent access inside the guest can bypass the guest virtio-fs client entirely by taking over the virtio-fs PCI device and building a virtqueue in userspace to submit raw FUSE requests directly to the host virtiofsd. A crafted FUSE_SYMLINK request whose new symlink name is an absolute host path is honored outside the configured shared directory, allowing guest root to create root-owned symlinks in sensitive host locations such as /etc/cron.d. By pointing such a symlink at a guest-controlled crontab payload reachable through a live runtime process's mount namespace, the attacker causes the host cron daemon to execute that payload as host root, crossing the Kata isolation boundary. This issue is fixed in version 3.31.0.

CVSS
9.2
EG Score
9.2CRITICALmedium confidence
EG Risk
57
EG Risk 57/100

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)
Severity92% × 45%
Impact severity (EG Severity): CVSS 9.2 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.
Exploitation public PoC (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 at low or medium mission impact and sooner than that at high.
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 (9.2): severity, escalated by confirmed exploitation. This CVE's 9.2 is its impact severity (EG Severity), not escalated.

EG Severity
9.2 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-12). 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, Track* at medium and Attend at high mission impact.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, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (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 27, 2026

Last Modified

September 9, 2026

Advisory Details (2)

Auto-updated Sep 15, 2026
Patch available. Sources: github.
GitHub advisoryMentions a patch (unverified)

runtime-rs: Guest-root to host-root escape via virtiofs · Advisory · kata-containers/kata-containers · GitHub

https://github.com/kata-containers/kata-containers/security/advisories/GHSA-2gv2-cffp-j227
Web page

oss-security - CVE-2026-47243: Kata Containers runtime-rs 3.30: virtiofsd symlink escape

http://www.openwall.com/lists/oss-security/2026/05/21/14

Vendor Advisories for CVE-2026-47243(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
gogithub.com/kata-containers/kata-containers @ 0.0.0-20260519062212-ffa59ce3aa78 (fixes < 0.0.0-20260519062212-ffa59ce3aa78)—ghsa

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

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFix by version rangeDependents
github.com/kata-containers/kata-containers—
  • every version up to 0.0.0-20260519062212-ffa59ce3aa78: fixed in 0.0.0-20260519062212-ffa59ce3aa78
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 17× in last 7d / 64× 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 its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS → 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). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 189 rows 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 89 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-13 04:34 UTCEchelonGraph re-scored
  2. 2026-11-13 04:34 UTCGHSA enrichmentGHSA-2gv2-cffp-j227 · GitHub severity HIGH
  3. 2026-11-12 16:34 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  4. 2026-11-12 04:52 UTCEchelonGraph re-scored
  5. 2026-11-12 04:52 UTCGHSA enrichmentGHSA-2gv2-cffp-j227 · GitHub severity HIGH
  6. 2026-11-11 16:39 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  7. 2026-11-11 05:09 UTCEchelonGraph re-scored
  8. 2026-11-11 05:09 UTCGHSA enrichmentGHSA-2gv2-cffp-j227 · GitHub severity HIGH
  9. 2026-11-10 16:44 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  10. 2026-11-10 05:26 UTCEchelonGraph re-scored
  11. 2026-11-10 05:26 UTCGHSA enrichmentGHSA-2gv2-cffp-j227 · GitHub severity HIGH
  12. 2026-11-09 16:35 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  13. 2026-11-09 05:43 UTCEchelonGraph re-scored
  14. 2026-11-09 05:43 UTCVendor advisory
  15. 2026-11-09 05:43 UTCGHSA enrichmentGHSA-2gv2-cffp-j227 · GitHub severity HIGH
  16. 2026-11-08 16:39 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  17. 2026-11-08 06:01 UTCEchelonGraph re-scored
  18. 2026-11-08 06:01 UTCVendor advisory
  19. 2026-11-08 06:01 UTCGHSA enrichmentGHSA-2gv2-cffp-j227 · GitHub severity HIGH
  20. 2026-11-07 16:39 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  21. 2026-11-07 06:18 UTCEchelonGraph re-scored
  22. 2026-11-07 06:18 UTCVendor advisory
  23. 2026-11-07 06:18 UTCGHSA enrichmentGHSA-2gv2-cffp-j227 · GitHub severity HIGH
  24. 2026-11-06 16:38 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  25. 2026-11-06 09:55 UTCOSV refresh
Show 75 more
  1. 2026-11-06 06:36 UTCEchelonGraph re-scored
  2. 2026-11-06 06:36 UTCVendor advisory
  3. 2026-11-06 06:36 UTCGHSA enrichmentGHSA-2gv2-cffp-j227 · GitHub severity HIGH
  4. 2026-11-05 16:37 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  5. 2026-11-05 06:54 UTCEchelonGraph re-scored
  6. 2026-11-05 06:54 UTCVendor advisory
  7. 2026-11-05 06:54 UTCGHSA enrichmentGHSA-2gv2-cffp-j227 · GitHub severity HIGH
  8. 2026-11-04 16:35 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  9. 2026-11-04 07:11 UTCEchelonGraph re-scored
  10. 2026-11-04 07:11 UTCVendor advisory
  11. 2026-11-04 07:11 UTCGHSA enrichmentGHSA-2gv2-cffp-j227 · GitHub severity HIGH
  12. 2026-11-03 16:48 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  13. 2026-11-03 07:25 UTCEchelonGraph re-scored
  14. 2026-11-03 07:25 UTCVendor advisory
  15. 2026-11-03 07:25 UTCGHSA enrichmentGHSA-2gv2-cffp-j227 · GitHub severity HIGH
  16. 2026-11-02 16:45 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  17. 2026-11-02 07:40 UTCEchelonGraph re-scored
  18. 2026-11-02 07:40 UTCVendor advisory
  19. 2026-11-02 07:40 UTCGHSA enrichmentGHSA-2gv2-cffp-j227 · GitHub severity HIGH
  20. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  21. 2026-11-01 07:58 UTCVendor advisory
  22. 2026-11-01 07:58 UTCGHSA enrichmentGHSA-2gv2-cffp-j227 · GitHub severity HIGH
  23. 2026-11-01 07:47 UTCGHSA enrichmentGHSA-2gv2-cffp-j227 · GitHub severity HIGH
  24. 2026-11-01 07:47 UTCEchelonGraph re-scored
  25. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  26. 2026-10-31 08:14 UTCEchelonGraph re-scored
  27. 2026-10-31 08:14 UTCVendor advisory
  28. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  29. 2026-10-30 08:32 UTCEchelonGraph re-scored
  30. 2026-10-30 08:32 UTCVendor advisory
  31. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  32. 2026-10-29 08:50 UTCEchelonGraph re-scored
  33. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  34. 2026-10-28 09:02 UTCEchelonGraph re-scored
  35. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  36. 2026-10-27 08:44 UTCEchelonGraph re-scored
  37. 2026-10-27 08:44 UTCVendor advisory
  38. 2026-10-26 07:06 UTCEchelonGraph re-scored
  39. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.2% · 9th percentile
  40. 2026-10-25 14:24 UTCEchelonGraph re-scored
  41. 2026-10-25 07:21 UTCEchelonGraph re-scored
  42. 2026-10-25 07:21 UTCVendor advisory
  43. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  44. 2026-10-24 07:38 UTCEchelonGraph re-scored
  45. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  46. 2026-10-23 07:54 UTCEchelonGraph re-scored
  47. 2026-10-23 07:54 UTCVendor advisory
  48. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  49. 2026-10-22 08:11 UTCEchelonGraph re-scored
  50. 2026-10-22 08:11 UTCVendor advisory
  51. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  52. 2026-10-21 08:24 UTCEchelonGraph re-scored
  53. 2026-10-21 08:24 UTCVendor advisory
  54. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  55. 2026-10-20 08:40 UTCEchelonGraph re-scored
  56. 2026-10-20 08:40 UTCVendor advisory
  57. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  58. 2026-10-19 08:55 UTCEchelonGraph re-scored
  59. 2026-10-19 08:55 UTCVendor advisory
  60. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  61. 2026-10-18 09:10 UTCVendor advisory
  62. 2026-10-18 03:36 UTCEchelonGraph re-scored
  63. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  64. 2026-10-17 07:14 UTCEchelonGraph re-scored
  65. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  66. 2026-10-16 07:30 UTCEchelonGraph re-scored
  67. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  68. 2026-10-15 06:24 UTCEchelonGraph re-scored
  69. 2026-10-15 06:24 UTCVendor advisory
  70. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  71. 2026-10-14 02:05 UTCEchelonGraph re-scored
  72. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  73. 2026-10-12 22:23 UTCEchelonGraph re-scored
  74. 2026-10-12 22:23 UTCVendor advisory
  75. 2026-10-12 16:02 UTCEchelonGraph re-scored

Frequently asked(5)

What is CVE-2026-47243?
CVE-2026-47243 is a critical-severity vulnerability; its CVE record was published on May 27, 2026. Kata Containers is an open source project focusing on a standard implementation of lightweight Virtual Machines (VMs) that perform like containers. Prior to 3.31.0, the runtime-rs standalone virtio-fs path is vulnerable to a guest-root to host-root escape. In this configuration, Kata runs the host…
When was the CVE record for CVE-2026-47243 published?
The CVE record for CVE-2026-47243 was published on May 27, 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 September 9, 2026; the record at its source may have been updated since.
Is CVE-2026-47243 actively exploited?
CVE-2026-47243 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-2026-47243?
CVE-2026-47243 has a CVSS base score of 9.2 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-47243?
A fix for CVE-2026-47243 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-47243 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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