CVE-2026-43198

Advisory lineage Upstream: 0 Downstream: 29
Analyzed
Published: 06 May 2026, 11:28
Last modified:20 Jul 2026, 12:04

Vulnerability Summary

Overall Risk (default)
high
70/100
CVSS Score
9.8 CRITICAL
v3.1 (cve.org)
EPSS Score
0.29% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

06 May 2026, 11:28
Published
Vulnerability first disclosed
20 Jul 2026, 12:04
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•CRITICAL•Score: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.29%• Percentile: 21%

Techniques & Countermeasures

  • CWE-362•Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

    The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

  • CWE-821•Incorrect Synchronization

    The product utilizes a shared resource in a concurrent manner, but it does not correctly synchronize access to the resource.

Affected Systems

  • linux•linux

    ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < fe89b2f05b854847784f91127319172945c1fadd | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 7178e2a8027423b2af17ab95df73a749a5b72e5b | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 858d2a4f67ff69e645a43487ef7ea7f28f06deae | 2.6.12

  • linux•linux kernel

    ≥ 2.6.12.1, < 6.18.16 | ≥ 6.19, < 6.19.6 | 2.6.12 | 2.6.12:rc2 | 2.6.12:rc3 | 2.6.12:rc4 | 2.6.12:rc5 | 7.0:rc1

References (20)