CVE-2026-43198

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

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

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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
—
EPSS
22.0%
KEV
Not listed

Published

May 6, 2026

Last Modified

July 20, 2026

Advisory Details (13)

Auto-updated Jul 20, 2026
Patch available. Sources: redhat.
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

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/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

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(15)

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 / EcosystemFixed in / PatchReleasedSource
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.

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 31× 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 158 total refreshes for this CVE.

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

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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 July 20, 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 22.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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.

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