CVE-2026-43198

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-06. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
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:

tcp: fix potential race in tcp_v6_syn_recv_sock()

Code in tcp_v6_syn_recv_sock() after the call to tcp_v4_syn_recv_sock() is done too late.

After tcp_v4_syn_recv_sock(), the child socket is already visible from TCP ehash table and other cpus might use it.

Since newinet->pinet6 is still pointing to the listener ipv6_pinfo bad things can happen as syzbot found.

Move the problematic code in tcp_v6_mapped_child_init() and call this new helper from tcp_v4_syn_recv_sock() before the ehash insertion.

This allows the removal of one tcp_sync_mss(), since tcp_v4_syn_recv_sock() will call it with the correct context.

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
23%
KEV
Not listed

Published

May 6, 2026

Last Modified

September 14, 2026

Advisory Details (18)

Auto-updated Sep 14, 2026
Patch available. Sources: redhat.
redhat Patch Available

Affected: Red Hat Enterprise Linux 10.0 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:33215
redhat Patch Available

Affected: Red Hat Enterprise Linux 10.

https://access.redhat.com/errata/RHSA-2026:30129
generic

tcp: fix potential race in tcp_v6_syn_recv_sock() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/fe89b2f05b854847784f91127319172945c1fadd
generic

tcp: fix potential race in tcp_v6_syn_recv_sock() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/dad1fe7db6c6519138430ac8f5e589c18f83bfc9
generic

tcp: fix potential race in tcp_v6_syn_recv_sock() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/cd644e6dc72eec8d9d988717ea1c54f8668ded69
generic

tcp: fix potential race in tcp_v6_syn_recv_sock() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/aef4a9ae95d1bc4f7897065011e6261026719aeb
generic

tcp: fix potential race in tcp_v6_syn_recv_sock() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a7e761ba55efaa9c49e0afdd304bb78167af3429
generic

tcp: fix potential race in tcp_v6_syn_recv_sock() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9ed654e340f4c73bc6f0af2fbc90ac293e645ce0
generic

tcp: fix potential race in tcp_v6_syn_recv_sock() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/858d2a4f67ff69e645a43487ef7ea7f28f06deae
generic

tcp: fix potential race in tcp_v6_syn_recv_sock() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/7178e2a8027423b2af17ab95df73a749a5b72e5b
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.6 Extended Update Support

https://access.redhat.com/errata/RHSA-2026:35894
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Red Hat Enterprise Linux 8.8 Telecommunications Update Serv

https://access.redhat.com/errata/RHSA-2026:35863
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions.

https://access.redhat.com/errata/RHSA-2026:34443
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.6 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:34094
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:33285
redhat Patch Available

2467228 – (CVE-2026-43198) CVE-2026-43198 kernel: tcp: fix potential race in tcp_v6_syn_recv_sock()

Affected: Red Hat Enterprise Linux 10

https://bugzilla.redhat.com/show_bug.cgi?id=2467228
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-43198
redhat

Affected: Red Hat Enterprise Linux 6",

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43198.json

Vendor Advisories for CVE-2026-43198(16)

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

Patch Availability(31)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-fips (4.4.0.1127.129) @ xenial2026-09-14ubuntu
ubuntulinux-tools-gcp-fips-5.4 (5.4.0.1165.107) @ focal2026-09-14ubuntu
ubuntulinux-tools-raspi-realtime-6.8 (6.8.0-2051.53) @ noble2026-09-14ubuntu
ubuntulinux-tools-gke-5.15 (5.15.0.1110.109) @ jammy2026-09-14ubuntu
ubuntulinux-tools-azure-fips-5.4 (5.4.0.1167.103) @ focal2026-09-14ubuntu
ubuntulinux-tools-gcp-edge (5.15.0.1114.124~20.04.1) @ focal2026-09-14ubuntu
ubuntulinux-tools-oracle-edge (5.4.0.1161.171~18.04.1) @ bionic2026-09-14ubuntu
ubuntulinux-tools-oracle (4.15.0.1158.169~16.04.1) @ xenial2026-09-14ubuntu
ubuntulinux-tools-azure-fde-edge (5.15.0.1118.127~20.04.1) @ focal2026-09-14ubuntu
ubuntulinux-virtual-hwe-16.04-edge (4.15.0.254.266~16.04.1) @ xenial2026-09-14ubuntu
ubuntulinux-tools-nvidia-tegra-igx-rt-5.15 (5.15.0.1054.56) @ jammy2026-09-14ubuntu
ubuntulinux-tools-azure (4.15.0.1205.220~14.04.1) @ trusty2026-09-14ubuntu
ubuntulinux-tools-kvm-5.4 (5.4.0.1149.145) @ focal2026-09-14ubuntu
ubuntulinux-virtual-hwe-16.04-edge (4.15.0.254.238) @ bionic2026-09-14ubuntu
ubuntulinux-tools-oracle-lts-24.04 (6.8.0-1059.62) @ noble2026-09-14ubuntu
ubuntulinux-virtual (3.13.0.215.225) @ trusty2026-09-14ubuntu
redhatkernel-rt-0:3.10.0-1160.155.1.rt56.1307.el72026-07-17redhat
redhatkernel-rt-0:4.18.0-553.140.1.rt7.481.el8_102026-07-07redhat
redhatkernel-0:4.18.0-553.140.1.el8_102026-07-07redhat
redhatkernel-0:3.10.0-1160.155.1.el72026-07-07redhat
redhatkernel-0:5.14.0-284.179.1.el9_22026-07-07redhat
redhatkernel-0:4.18.0-305.197.1.el8_42026-07-06redhat
redhatkernel-0:4.18.0-477.150.1.el8_82026-07-06redhat
redhatkernel-0:4.18.0-372.199.1.el8_62026-07-06redhat
redhatkernel-rt-0:5.14.0-284.179.1.rt14.464.el9_22026-07-06redhat
redhatkernel-0:5.14.0-427.135.1.el9_42026-07-01redhat
redhatkernel-0:5.14.0-570.125.1.el9_62026-07-01redhat
redhatkernel-0:5.14.0-687.20.1.el9_82026-06-30redhat
redhatkernel-0:6.12.0-55.84.1.el10_02026-06-29redhat
redhatkernel-0:6.12.0-211.28.1.el10_22026-06-25redhat
linuxKernel @ 6.18.16—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
linux5.10.103-1 ... 7.2~rc5-1~exp1 (496 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 7.2~rc7-1~exp1 (350 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.2~rc7-1~exp1 (174 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 6.19~rc8-1~exp1 (116 versions)6.19.6-1—

Weakness Classification(2)

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

Additional Vendor Advisories

(11)

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 12× in last 7d / 34× 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 339 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-43198?
CVE-2026-43198 is a critical vulnerability published on May 6, 2026. In the Linux kernel, the following vulnerability has been resolved: tcp: fix potential race in tcpv6synrecvsock() Code in tcpv6synrecvsock() after the call to tcpv4synrecvsock() is done too late. After tcpv4synrecvsock(), the child socket is already visible from TCP ehash table and other cpus might…
When was CVE-2026-43198 disclosed?
CVE-2026-43198 was first published in the National Vulnerability Database on May 6, 2026, with the most recent update on September 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43198 actively exploited?
CVE-2026-43198 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 77.3% of all scored CVEs.
What is the CVSS score of CVE-2026-43198?
CVE-2026-43198 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-43198?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43198, 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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