CVE-2026-43341

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-08. the CNA's CVSS baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:linux, epss, ghsa
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

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

net/ipv6: ioam6: prevent schema length wraparound in trace fill

ioam6_fill_trace_data() stores the schema contribution to the trace length in a u8. With bit 22 enabled and the largest schema payload, sclen becomes 1 + 1020 / 4, wraps from 256 to 0, and bypasses the remaining-space check. __ioam6_fill_trace_data() then positions the write cursor without reserving the schema area but still copies the 4-byte schema header and the full schema payload, overrunning the trace buffer.

Keep sclen in an unsigned int so the remaining-space check and the write cursor calculation both see the full schema length.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity98% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
34%
KEV
Not listed

Published

May 8, 2026

Last Modified

August 5, 2026

Advisory Details (7)

Auto-updated Sep 9, 2026
No patch confirmed yet.
generic

net/ipv6: ioam6: prevent schema length wraparound in trace fill - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5e67ba9bb531e1ec6599a82a065dea9040b9ce50
generic

net/ipv6: ioam6: prevent schema length wraparound in trace fill - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d6e1c9b02d85a4f1f4ba6d68e916d9b610a3ed7d
generic

net/ipv6: ioam6: prevent schema length wraparound in trace fill - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/184d2e9db27c0f76226b5cad16fe29510a5d2280
generic

net/ipv6: ioam6: prevent schema length wraparound in trace fill - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/77695a69baca9b99d95fad09fc78c2318736604f
generic

net/ipv6: ioam6: prevent schema length wraparound in trace fill - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d1b041080086e91d3733a5438a8c51ad5d3d8e09
generic

net/ipv6: ioam6: prevent schema length wraparound in trace fill - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e96d48b37708d53cbdc47f6f60b0714fc4a5f596
generic

net/ipv6: ioam6: prevent schema length wraparound in trace fill - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d3a1fb2ca323d7a4e10ab3afbfa25e6d8921e4f2

Vendor Advisories for CVE-2026-43341(3)

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

Patch Availability(29)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-realtime-hwe-22.04 (6.8.1-1055.56~22.04.1) @ jammy2026-08-23ubuntu
ubuntulinux-virtual-hwe-20.04-edge (5.15.0.185.166) @ jammy2026-08-23ubuntu
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1058.61.1) @ noble2026-08-23ubuntu
ubuntulinux-tools-lowlatency-hwe-20.04-edge (6.8.0-134.134.1) @ noble2026-08-23ubuntu
ubuntulinux-tools-nvidia-tegra-rt-6.8 (6.8.0-1029.30) @ noble2026-08-23ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1032.33) @ noble2026-08-23ubuntu
ubuntulinux-tools-oracle-edge (5.15.0.1108.114~20.04.1) @ focal2026-08-23ubuntu
ubuntulinux-tools-nvidia-hwe-24.04 (6.17.0-1026.26) @ noble2026-08-23ubuntu
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2049.50) @ noble2026-08-23ubuntu
ubuntulinux-tools-realtime-hwe-24.04 (6.17.0-1017.19~24.04.1) @ noble2026-08-23ubuntu
ubuntulinux-tools-raspi-6.8 (6.8.0-1060.64) @ noble2026-08-23ubuntu
ubuntulinux-tools-fips-6.8 (6.8.0-134.134+fips1) @ noble2026-08-23ubuntu
ubuntulinux-virtual-hwe-24.04-edge (6.17.0-40.40) @ questing2026-08-23ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.15.0-1074 (5.15.0-1074.78) @ jammy2026-08-23ubuntu
ubuntulinux-virtual-hwe-24.04 (6.17.0-40.40~24.04.1) @ noble2026-08-23ubuntu
ubuntulinux-tools-raspi-6.17 (6.17.0-1021.21) @ questing2026-08-23ubuntu
ubuntulinux-tools-intel-iotg-edge (5.15.0.1106.112~20.04.1) @ focal2026-08-23ubuntu
ubuntulinux-tools-azure-6.17 (6.17.0-1021.21~24.04.1) @ noble2026-08-23ubuntu
ubuntulinux-tools-azure-fde-6.17 (6.17.0-1018.18~24.04.1) @ noble2026-08-23ubuntu
ubuntulinux-tools-azure-edge (6.8.0-1063.71~22.04.1) @ jammy2026-08-23ubuntu
ubuntulinux-tools-azure-fde-lts-24.04 (6.8.0-1062.69) @ noble2026-08-23ubuntu
ubuntulinux-tools-azure-fde-6.8 (6.8.0-1062.69~22.04.1) @ jammy2026-08-23ubuntu
ubuntulinux-tools-azure-fips-5.15 (5.15.0.1116.101) @ jammy2026-08-23ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-136.136~22.04.1) @ jammy2026-08-23ubuntu
ubuntulinux-tools-raspi-nolpae (5.15.0.1105.103) @ jammy2026-08-23ubuntu
ubuntulinux-tools-oem-6.17 (6.17.0-1028.28) @ noble2026-08-23ubuntu
redhatkernel-0:6.12.0-211.31.1.el10_22026-07-08redhat
redhatkernel-0:6.12.0-55.84.1.el10_02026-06-29redhat
linuxKernel @ 5.15.210—osv

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 rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (48 versions)6.1.170-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.85-1~bpo12+1 (17 versions)6.12.85-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 6.19~rc8-1~exp1 (125 versions)6.19.12-1—

Additional Vendor Advisories

(23)

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 7× in last 7d / 35× 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 350 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-43341?
CVE-2026-43341 is a critical vulnerability published on May 8, 2026. In the Linux kernel, the following vulnerability has been resolved: net/ipv6: ioam6: prevent schema length wraparound in trace fill ioam6filltrace_data() stores the schema contribution to the trace length in a u8. With bit 22 enabled and the largest schema payload, sclen becomes 1 + 1020 / 4, wraps…
When was CVE-2026-43341 disclosed?
CVE-2026-43341 was first published in the National Vulnerability Database on May 8, 2026, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43341 actively exploited?
CVE-2026-43341 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 65.6% of all scored CVEs.
What is the CVSS score of CVE-2026-43341?
CVE-2026-43341 has a CVSS v4.0 base score of 9.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-43341?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43341, 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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