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CVE-2026-43198: tcp: fix potential race in tcp_v6_syn_recv_sock()

highCVSS 7CVE-2026-43198

CSIRTS triage

vendor: Linuxproduct: Linux KernelMemory corruption
What
A race condition in TCP IPv6 socket establishment (tcp_v6_syn_recv_sock) can lead to memory corruption.
Who is affected
Systems running Linux kernel with IPv6 TCP connections, all recent versions.
Urgency
High; race conditions in network code are difficult to exploit reliably but can cause memory corruption and potential code execution.
Action
Update to a patched Linux kernel version addressing CVE-2026-43198.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 7
Published
2026-08-06
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-43198

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-43198coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for tcp

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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