CVE-2026-43057

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-05-01. the CNA's CVSS baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:linux, epss, ghsa
Trending — 4 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

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

net: correctly handle tunneled traffic on IPV6_CSUM GSO fallback

NETIF_F_IPV6_CSUM only advertises support for checksum offload of packets without IPv6 extension headers. Packets with extension headers must fall back onto software checksumming. Since TSO depends on checksum offload, those must revert to GSO.

The below commit introduces that fallback. It always checks network header length. For tunneled packets, the inner header length must be checked instead. Extend the check accordingly.

A special case is tunneled packets without inner IP protocol. Such as RFC 6951 SCTP in UDP. Those are not standard IPv6 followed by transport header either, so also must revert to the software GSO path.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
38(Track)
EG Risk 38/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
32%
KEV
Not listed

Published

May 1, 2026

Last Modified

September 8, 2026

Advisory Details (6)

Auto-updated May 6, 2026
No patch confirmed yet.
generic

net: correctly handle tunneled traffic on IPV6_CSUM GSO fallback - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ed71cf465c75f5688b07a35d373cd1d6b589c8ea
generic

net: correctly handle tunneled traffic on IPV6_CSUM GSO fallback - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c4336a07eb6b2526dc2b62928b5104b41a7f81f5
generic

net: correctly handle tunneled traffic on IPV6_CSUM GSO fallback - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a98b78116a27e2a57b696b569b2cb431c95cf9b6
generic

net: correctly handle tunneled traffic on IPV6_CSUM GSO fallback - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/732fdeb2987c94b439d51f5cb9addddc2fc48c42
generic

net: correctly handle tunneled traffic on IPV6_CSUM GSO fallback - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/33670f780e0120c3dacda188c512bbffe0b6044c
generic

net: correctly handle tunneled traffic on IPV6_CSUM GSO fallback - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2094a7cf91b71367b649f991aacc7b579f793d0b

Vendor Advisories for CVE-2026-43057(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)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1059.62.1) @ noble2026-09-08ubuntu
ubuntulinux-virtual-6.8 (6.8.0-136.136) @ noble2026-09-08ubuntu
ubuntulinux-tools-oracle-lts-24.04 (6.8.0-1058.61) @ noble2026-09-08ubuntu
ubuntulinux-tools-oracle-edge (6.8.0-1058.61~22.04.1) @ jammy2026-09-08ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.8.0-136.136~22.04.1) @ jammy2026-09-08ubuntu
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2050.52) @ noble2026-09-08ubuntu
ubuntulinux-tools-gcp-fips-6.8 (6.8.0-1064.72+fips1) @ noble2026-09-08ubuntu
ubuntulinux-tools-aws-lts-24.04 (6.8.0-1061.64+1) @ noble2026-09-08ubuntu
ubuntulinux-tools-azure-fde-lts-24.04 (6.8.0-1062.69) @ noble2026-09-08ubuntu
ubuntulinux-tools-azure-fde-6.8 (6.8.0-1062.69~22.04.1) @ jammy2026-09-08ubuntu
ubuntulinux-tools-azure-lts-24.04 (6.8.0-1063.71) @ noble2026-09-08ubuntu
ubuntulinux-tools-aws-fips-6.8 (6.8.0-1061.64+fips1) @ noble2026-09-08ubuntu
ubuntulinux-tools-azure-fips-6.8 (6.8.0-1063.71+fips2) @ noble2026-09-08ubuntu
ubuntulinux-xilinx-zynqmp (6.8.0.1033.34) @ noble2026-09-08ubuntu
linuxKernel @ 6.1.168—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

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux-6.16.1.106-3~deb11u1 ... 6.1.164-1~deb11u1 (16 versions)6.1.170-1~deb11u1—
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—

All Vendor Advisories

(14)

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 9× in last 7d / 33× 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 219 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 UTCEPSS rescore
  4. 2026-09-11 09:37 UTCEPSS rescore
  5. 2026-09-10 09:34 UTCEPSS rescore
  6. 2026-09-08 22:00 UTCEPSS rescore
  7. 2026-09-08 09:02 UTCEG score recompute
  8. 2026-09-08 09:02 UTCVendor advisory
  9. 2026-09-08 09:02 UTCGHSA enrichment
  10. 2026-09-07 16:01 UTCEPSS rescore
  11. 2026-09-06 13:47 UTCEPSS rescore
  12. 2026-09-04 05:06 UTCEPSS rescore
  13. 2026-09-02 14:12 UTCEPSS rescore
  14. 2026-09-01 13:54 UTCEPSS rescore
  15. 2026-08-30 19:17 UTCEPSS rescore
  16. 2026-08-30 01:22 UTCEPSS rescore
  17. 2026-08-28 21:41 UTCEPSS rescore
  18. 2026-08-27 14:25 UTCEPSS rescore
  19. 2026-08-26 14:46 UTCEPSS rescore
  20. 2026-08-25 13:49 UTCEPSS rescore
  21. 2026-08-23 21:47 UTCEG score recompute
  22. 2026-08-23 21:47 UTCVendor advisory
  23. 2026-08-23 21:46 UTCGHSA enrichment
  24. 2026-08-23 00:19 UTCEPSS rescore
  25. 2026-08-21 23:49 UTCEPSS rescore
Show 75 more
  1. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-19 17:03 UTCEPSS rescore
  3. 2026-08-18 13:48 UTCEPSS rescore
  4. 2026-08-17 13:47 UTCEPSS rescore
  5. 2026-08-17 13:20 UTCEG score recompute
  6. 2026-08-17 13:20 UTCVendor advisory
  7. 2026-08-17 13:20 UTCGHSA enrichment
  8. 2026-08-16 14:56 UTCEPSS rescore
  9. 2026-08-16 05:15 UTCEG score recompute
  10. 2026-08-16 05:15 UTCVendor advisory
  11. 2026-08-16 05:15 UTCGHSA enrichment
  12. 2026-08-16 02:14 UTCEPSS rescore
  13. 2026-08-15 02:04 UTCEG score recompute
  14. 2026-08-15 02:04 UTCVendor advisory
  15. 2026-08-15 02:04 UTCGHSA enrichment
  16. 2026-08-15 01:30 UTCEPSS rescore
  17. 2026-08-14 14:54 UTCVendor advisory
  18. 2026-08-14 14:54 UTCGHSA enrichment
  19. 2026-08-14 03:44 UTCEG score recompute
  20. 2026-08-14 03:44 UTCVendor advisory
  21. 2026-08-14 03:44 UTCGHSA enrichment
  22. 2026-08-13 22:00 UTCEPSS rescore
  23. 2026-08-13 04:33 UTCVendor advisory
  24. 2026-08-13 04:33 UTCGHSA enrichment
  25. 2026-08-12 17:23 UTCEG score recompute
  26. 2026-08-12 17:23 UTCVendor advisory
  27. 2026-08-12 17:23 UTCGHSA enrichment
  28. 2026-08-12 13:51 UTCEPSS rescore
  29. 2026-08-11 16:15 UTCEG score recompute
  30. 2026-08-11 16:15 UTCVendor advisory
  31. 2026-08-11 16:15 UTCGHSA enrichment
  32. 2026-08-11 13:43 UTCEPSS rescore
  33. 2026-08-11 01:47 UTCEG score recompute
  34. 2026-08-11 01:47 UTCVendor advisory
  35. 2026-08-11 01:47 UTCGHSA enrichment
  36. 2026-08-11 00:00 UTCEPSS rescore
  37. 2026-08-10 12:45 UTCVendor advisory
  38. 2026-08-10 12:45 UTCGHSA enrichment
  39. 2026-08-10 01:12 UTCVendor advisory
  40. 2026-08-10 01:12 UTCGHSA enrichment
  41. 2026-08-09 14:02 UTCEG score recompute
  42. 2026-08-09 14:02 UTCVendor advisory
  43. 2026-08-09 14:02 UTCGHSA enrichment
  44. 2026-08-09 13:46 UTCEPSS rescore
  45. 2026-08-09 02:51 UTCEG score recompute
  46. 2026-08-09 02:51 UTCVendor advisory
  47. 2026-08-09 02:51 UTCGHSA enrichment
  48. 2026-08-08 16:37 UTCEPSS rescore
  49. 2026-08-08 12:03 UTCVendor advisory
  50. 2026-08-08 12:03 UTCGHSA enrichment
  51. 2026-08-08 00:51 UTCEG score recompute
  52. 2026-08-08 00:51 UTCVendor advisory
  53. 2026-08-08 00:51 UTCGHSA enrichment
  54. 2026-08-07 13:42 UTCVendor advisory
  55. 2026-08-07 13:42 UTCGHSA enrichment
  56. 2026-08-07 02:30 UTCEG score recompute
  57. 2026-08-07 02:30 UTCVendor advisory
  58. 2026-08-07 02:30 UTCGHSA enrichment
  59. 2026-08-06 13:46 UTCEPSS rescore
  60. 2026-08-06 11:05 UTCVendor advisory
  61. 2026-08-06 11:05 UTCGHSA enrichment
  62. 2026-08-05 23:44 UTCEG score recompute
  63. 2026-08-05 23:44 UTCVendor advisory
  64. 2026-08-05 23:44 UTCGHSA enrichment
  65. 2026-08-05 19:17 UTCEPSS rescore
  66. 2026-08-05 12:34 UTCEG score recompute
  67. 2026-08-05 12:34 UTCVendor advisory
  68. 2026-08-05 12:34 UTCGHSA enrichment
  69. 2026-08-04 15:10 UTCEPSS rescore
  70. 2026-08-04 10:38 UTCEPSS rescore
  71. 2026-08-03 20:17 UTCVendor advisory
  72. 2026-08-03 20:17 UTCGHSA enrichment
  73. 2026-08-02 16:48 UTCVendor advisory
  74. 2026-08-02 16:48 UTCGHSA enrichment
  75. 2026-08-02 05:37 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-43057?
CVE-2026-43057 is a high vulnerability published on May 1, 2026. In the Linux kernel, the following vulnerability has been resolved: net: correctly handle tunneled traffic on IPV6_CSUM GSO fallback NETIFFIPV6_CSUM only advertises support for checksum offload of packets without IPv6 extension headers. Packets with extension headers must fall back onto software…
When was CVE-2026-43057 disclosed?
CVE-2026-43057 was first published in the National Vulnerability Database on May 1, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43057 actively exploited?
CVE-2026-43057 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 67.6% of all scored CVEs.
What is the CVSS score of CVE-2026-43057?
CVE-2026-43057 has a CVSS v4.0 base score of 7.5 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-43057?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43057, 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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