NVD

CVE-2026-43198 Detail

Modified After Enrichment

This CVE record has been updated after NVD enrichment efforts were completed. Enrichment data supplied by the NVD may require amendment due to these changes.

Description

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.

Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

CVSS 3.x Severity and Vector Strings:

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

Nist CVSS score does not match with CNA score

CNA: kernel.org

Base Score: 9.8 CRITICAL

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

ADP: redhat-SADP

Base Score: 7.0 HIGH

Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS 2.0 Severity and Vector Strings:

National Institute of Standards and Technology

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://access.redhat.com/errata/RHSA-2026:30129	redhat-SADP
https://access.redhat.com/errata/RHSA-2026:33215	redhat-SADP
https://access.redhat.com/errata/RHSA-2026:33285	redhat-SADP
https://access.redhat.com/errata/RHSA-2026:34094	redhat-SADP
https://access.redhat.com/errata/RHSA-2026:34443	redhat-SADP
https://access.redhat.com/security/cve/CVE-2026-43198	redhat-SADP
https://bugzilla.redhat.com/show_bug.cgi?id=2467228	redhat-SADP
https://git.kernel.org/stable/c/7178e2a8027423b2af17ab95df73a749a5b72e5b	kernel.org	Patch
https://git.kernel.org/stable/c/858d2a4f67ff69e645a43487ef7ea7f28f06deae	kernel.org	Patch
https://git.kernel.org/stable/c/fe89b2f05b854847784f91127319172945c1fadd	kernel.org	Patch
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43198.json	redhat-SADP

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-362	Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')	NIST
CWE-821	Incorrect Synchronization	redhat-SADP

Known Affected Software Configurations Switch to CPE 2.2

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Change History

6 change records found show changes

CVE Modified by redhat-SADP 7/02/2026 8:17:18 AM

Action

Type

Old Value

New Value

Added

Reference

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

Added

Reference

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

Changed

Affected

Record truncated, showing 2048 of 2900 characters.
View Entire Change Record

[{"vendor":"Red Hat","product":"Red Hat Enterprise Linux AppStream EUS (v. 10.0)","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux_eus:10.0"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux AppStream (v. 10)","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux:10.2"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux AppStream (v. 9)","defaultStatus":"affected","cpes":["cpe:/a:redhat:enterprise_linux:9::appstream"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux BaseOS EUS (v. 10.0)","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux_eus:10.0"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux BaseOS (v. 10)","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux:10.2"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux BaseOS (v. 9)","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux:9::baseos"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux_eus:10.0"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux:10.2"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)","defaultStatus":"affected","cpes":["cpe:/a:redhat:enterprise_linux:9::crb"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux_eus:10.0"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux Real Time for NFV (v. 10)","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux:10.2"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux Real Time for NFV (v. 9)","defaultStatus":"affected","cpes":["cpe:/a:redhat:enterprise_linux:9::nfv"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux Real Time EUS (v. 10.0)","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterp

Record truncated, showing 2048 of 4285 characters.
View Entire Change Record

[{"vendor":"Red Hat","product":"Red Hat Enterprise Linux AppStream EUS (v. 10.0)","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux_eus:10.0"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux AppStream (v. 10)","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux:10.2"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux AppStream E4S (v.9.4)","defaultStatus":"affected","cpes":["cpe:/a:redhat:rhel_e4s:9.4::appstream"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux AppStream EUS (v.9.6)","defaultStatus":"affected","cpes":["cpe:/a:redhat:rhel_eus:9.6::appstream"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux AppStream (v. 9)","defaultStatus":"affected","cpes":["cpe:/a:redhat:enterprise_linux:9::appstream"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux BaseOS EUS (v. 10.0)","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux_eus:10.0"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux BaseOS (v. 10)","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux:10.2"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux BaseOS E4S (v.9.4)","defaultStatus":"affected","cpes":["cpe:/o:redhat:rhel_e4s:9.4::baseos"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux BaseOS EUS (v.9.6)","defaultStatus":"affected","cpes":["cpe:/o:redhat:rhel_eus:9.6::baseos"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux BaseOS (v. 9)","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux:9::baseos"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux_eus:10.0"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux:10.2"]},{"vendor":"Red Hat","product":"Red Hat CodeReady Linux Builder EUS (v.9.6)","defaultStatus":"affected","cpes":["cpe:/a:redhat:rhel_eus:9.6::crb"]},{"vendor":"Red Hat","product

CVE Modified by redhat-SADP 6/29/2026 11:19:45 PM

Action	Type	New Value
Added	CVSS V3.1	AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Added	CWE	CWE-821
Added	Reference	https://access.redhat.com/errata/RHSA-2026:30129
Added	Reference	https://access.redhat.com/errata/RHSA-2026:33215
Added	Reference	https://access.redhat.com/errata/RHSA-2026:33285
Added	Reference	https://access.redhat.com/security/cve/CVE-2026-43198
Added	Reference	https://bugzilla.redhat.com/show_bug.cgi?id=2467228
Added	Reference	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43198.json
Added	Affected	Record truncated, showing 2048 of 2900 characters. View Entire Change Record [{"vendor":"Red Hat","product":"Red Hat Enterprise Linux AppStream EUS (v. 10.0)","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux_eus:10.0"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux AppStream (v. 10)","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux:10.2"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux AppStream (v. 9)","defaultStatus":"affected","cpes":["cpe:/a:redhat:enterprise_linux:9::appstream"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux BaseOS EUS (v. 10.0)","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux_eus:10.0"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux BaseOS (v. 10)","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux:10.2"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux BaseOS (v. 9)","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux:9::baseos"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux_eus:10.0"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux:10.2"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)","defaultStatus":"affected","cpes":["cpe:/a:redhat:enterprise_linux:9::crb"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux_eus:10.0"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux Real Time for NFV (v. 10)","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux:10.2"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux Real Time for NFV (v. 9)","defaultStatus":"affected","cpes":["cpe:/a:redhat:enterprise_linux:9::nfv"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux Real Time EUS (v. 10.0)","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterp

CVE Modified by kernel.org 6/17/2026 6:49:08 AM

Action

Type

Old Value

New Value

Added

Affected

[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","programFiles":["include/net/inet_connection_sock.h","include/net/tcp.h","net/ipv4/syncookies.c","net/ipv4/tcp_fastopen.c","net/ipv4/tcp_ipv4.c","net/ipv4/tcp_minisocks.c","net/ipv6/tcp_ipv6.c","net/mptcp/subflow.c","net/smc/af_smc.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"fe89b2f05b854847784f91127319172945c1fadd","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"7178e2a8027423b2af17ab95df73a749a5b72e5b","versionType":"git","status":"affected"},{"version":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2","lessThan":"858d2a4f67ff69e645a43487ef7ea7f28f06deae","versionType":"git","status":"affected"}]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","programFiles":["include/net/inet_connection_sock.h","include/net/tcp.h","net/ipv4/syncookies.c","net/ipv4/tcp_fastopen.c","net/ipv4/tcp_ipv4.c","net/ipv4/tcp_minisocks.c","net/ipv6/tcp_ipv6.c","net/mptcp/subflow.c","net/smc/af_smc.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","versions":[{"version":"2.6.12","status":"affected"},{"version":"0","lessThan":"2.6.12","versionType":"semver","status":"unaffected"},{"version":"6.18.16","lessThanOrEqual":"6.18.*","versionType":"semver","status":"unaffected"},{"version":"6.19.6","lessThanOrEqual":"6.19.*","versionType":"semver","status":"unaffected"},{"version":"7.0","lessThanOrEqual":"*","versionType":"original_commit_for_fix","status":"unaffected"}]}]

Initial Analysis by NIST 5/11/2026 4:12:11 PM

Action	Type	New Value
Added	CWE	CWE-362
Added	CPE Configuration	OR cpe:2.3:o:linux:linux_kernel:2.6.12:rc4::::::* cpe:2.3:o:linux:linux_kernel:2.6.12:rc5::::::* cpe:2.3:o:linux:linux_kernel:2.6.12:rc2::::::* cpe:2.3:o:linux:linux_kernel:2.6.12:rc3::::::* cpe:2.3:o:linux:linux_kernel:2.6.12:-::::::* cpe:2.3:o:linux:linux_kernel:7.0:rc1::::::* cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 6.19 up to (excluding) 6.19.6 cpe:2.3:o:linux:linux_kernel::::::::* versions from (including) 2.6.12.1 up to (excluding) 6.18.16
Added	Reference Type	kernel.org: https://git.kernel.org/stable/c/7178e2a8027423b2af17ab95df73a749a5b72e5b Types: Patch
Added	Reference Type	kernel.org: https://git.kernel.org/stable/c/858d2a4f67ff69e645a43487ef7ea7f28f06deae Types: Patch
Added	Reference Type	kernel.org: https://git.kernel.org/stable/c/fe89b2f05b854847784f91127319172945c1fadd Types: Patch

New CVE Received from kernel.org 5/06/2026 8:16:38 AM

Action	Type	New Value
Added	Description	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.
Added	Reference	https://git.kernel.org/stable/c/7178e2a8027423b2af17ab95df73a749a5b72e5b
Added	Reference	https://git.kernel.org/stable/c/858d2a4f67ff69e645a43487ef7ea7f28f06deae
Added	Reference	https://git.kernel.org/stable/c/fe89b2f05b854847784f91127319172945c1fadd

Quick Info

CVE Dictionary Entry:
CVE-2026-43198
NVD Published Date:
05/06/2026
NVD Last Modified:
07/02/2026
Source:
kernel.org

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National Vulnerability Database

National Vulnerability Database

CVE-2026-43198 Detail

Description

Metrics

References to Advisories, Solutions, and Tools

Weakness Enumeration

Known Affected Software Configurations Switch to CPE 2.2

CPEs loading, please wait.

Change History

CVE Modified by redhat-SADP 7/02/2026 8:17:18 AM

CVE Modified by redhat-SADP 6/29/2026 11:19:45 PM

CVE Modified by kernel.org 6/17/2026 6:49:08 AM

Initial Analysis by NIST 5/11/2026 4:12:11 PM

CVE Modified by kernel.org 5/08/2026 9:16:44 AM

New CVE Received from kernel.org 5/06/2026 8:16:38 AM

Quick Info