CVE-2026-43406

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-08. NVD baseline CVSS 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.1Exploit: None knownExposed: 0

A fix is available — apply it.

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

libceph: prevent potential out-of-bounds reads in process_message_header()

If the message frame is (maliciously) corrupted in a way that the length of the control segment ends up being less than the size of the message header or a different frame is made to look like a message frame, out-of-bounds reads may ensue in process_message_header().

Perform an explicit bounds check before decoding the message header.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
46(Track)
EG Risk 46/100SSVC: 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
Severity91% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
41%
KEV
Not listed

Published

May 8, 2026

Last Modified

August 5, 2026

Advisory Details (7)

Auto-updated Aug 29, 2026
No patch confirmed yet.
generic

libceph: prevent potential out-of-bounds reads in process_message_header() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/69fb5d91bba44ecf7eb80530b85fa4fb028921d5
generic

libceph: prevent potential out-of-bounds reads in process_message_header() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/035867ae6f18df0aeedb2a57a5b74091bd4e3fe8
generic

libceph: prevent potential out-of-bounds reads in process_message_header() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/69fe5af33fa3806f398d21c081d73c66e5523bc2
generic

libceph: prevent potential out-of-bounds reads in process_message_header() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/dbd857a9e1e33ea71eaf3e211877027e533770d1
generic

libceph: prevent potential out-of-bounds reads in process_message_header() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/50156622eb0888e62541d715a98584480a1bc7cb
generic

libceph: prevent potential out-of-bounds reads in process_message_header() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/75582aaa580c11aed4c7731cad6b068b700e7efb
generic

libceph: prevent potential out-of-bounds reads in process_message_header() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/76ccf21a12c5f6d6790bc32c7da82446d877b2f4

Vendor Advisories for CVE-2026-43406(1)

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

Patch Availability(27)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1063.71) @ noble2026-08-23ubuntu
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-virtual-hwe-24.04-edge (6.17.0-40.40) @ questing2026-08-23ubuntu
ubuntulinux-tools-oem-6.17 (6.17.0-1028.28) @ noble2026-08-23ubuntu
ubuntulinux-virtual-6.8 (6.8.0-134.134) @ noble2026-08-23ubuntu
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-nvidia-tegra-rt-6.8 (6.8.0-1029.30) @ noble2026-08-23ubuntu
ubuntulinux-tools-lowlatency-hwe-20.04-edge (6.8.0-134.134.1) @ 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-edge (6.17.0-1017.19) @ questing2026-08-23ubuntu
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-tools-raspi-nolpae (5.15.0.1105.103) @ jammy2026-08-23ubuntu
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
linuxKernel @ 5.15.203—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 (119 versions)6.19.10-1—

Weakness Classification(1)

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

All Vendor Advisories

(25)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 5× in last 7d / 128× 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 342 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-43406?
CVE-2026-43406 is a critical vulnerability published on May 8, 2026. In the Linux kernel, the following vulnerability has been resolved: libceph: prevent potential out-of-bounds reads in processmessageheader() If the message frame is (maliciously) corrupted in a way that the length of the control segment ends up being less than the size of the message header or a…
When was CVE-2026-43406 disclosed?
CVE-2026-43406 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-2026-43406 actively exploited?
CVE-2026-43406 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 58.9% of all scored CVEs.
What is the CVSS score of CVE-2026-43406?
CVE-2026-43406 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-43406?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43406, 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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