PT-2026-37538 · Linux · Linux Kernel

Syzbot · Published 2026-05-06 · Updated 2026-05-14 · CVE-2026-43198

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A race condition exists in the Linux kernel within the tcp v6 syn recv sock() function. The issue occurs because certain operations are performed after the call to tcp v4 syn recv sock(), at which point the child socket is already visible in the TCP ehash table and accessible by other CPUs. Because newinet->pinet6 still points to the listener ipv6 pinfo during this window, it can lead to unstable system behavior.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Race Condition

Weakness Enumeration

CWE-362

Related Identifiers

CVE-2026-43198

Affected Products

Linux Kernel

References · 15

• https://git.kernel.org/stable/c/7178e2a8027423b2af17ab95df73a749a5b72e5b · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43198 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2026-43198 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-43198 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-43198 · Vendor Advisory
• https://git.kernel.org/stable/c/fe89b2f05b854847784f91127319172945c1fadd · Patch
• https://security-tracker.debian.org/tracker/CVE-2026-43198 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-43198 · Security Note
• https://git.kernel.org/stable/c/858d2a4f67ff69e645a43487ef7ea7f28f06deae · Patch
• https://cve.org/CVERecord?id=CVE-2026-43198 · Security Note
• https://twitter.com/lyrie_ai/status/2054755100325761405 · Twitter Post
• https://git.kernel.org/linus/858d2a4f67ff69e645a43487ef7ea7f28f06deae · Note
• https://docs.bell-sw.com/security/cves/CVE-2026-43198 · Note
• https://twitter.com/windowsforum/status/2052315734189961226 · Twitter Post
• https://twitter.com/lyrie_ai/status/2054755098895483244 · Twitter Post