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
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 9.8Exploit: None knownExposed services: Not assessed

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
9.8CRITICALmedium confidence
EG Risk
49
EG Risk 49/100

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%
EPSS PROB
0.4%
EPSS %ILE
31st
KEV
Not listed

Published

May 6, 2026

Last Modified

September 14, 2026

Advisory Details (18)

Auto-updated Oct 5, 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(32)

Vendor / EcosystemFix (by version range) / 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 @ 5.10.270 (fixes >=2.6.12)—osv
linuxKernel @ 6.18.16 (fixes >=2.6.12)—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

(5 across 4 ecosystems)
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.106-1 ... 7.2~rc7-1~exp1 (360 versions)
  • every version on: no fix on record
—
linux-6.126.12.100-1~deb12u1, 6.12.101-1~deb12u1, 6.12.107-1~deb12u1
  • every version up to 6.12.111-1~deb12u1: fixed in 6.12.111-1~deb12u1
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
linux5.10.103-1 ... 7.2~rc5-1~exp1 (496 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 6.12.96-1 (35 versions)
  • every version up to 6.12.111-1: fixed in 6.12.111-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.12.100-1 ... 6.19~rc8-1~exp1 (117 versions)
  • every version up to 6.19.6-1: fixed in 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 5× in last 7d / 28× 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 348 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

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 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 0.4% probability of exploitation in the next 30 days (31st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-43198?
CVE-2026-43198 has a CVSS base score of 9.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-43198?
A fix for CVE-2026-43198 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-43198 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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