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CVE-2026-43036: net: use skb_header_pointer() for TCPv4 GSO frag_off check

mediumCVSS 5.5CVE-2026-43036

CSIRTS triage

vendor: Linuxproduct: Linux KernelMemory corruption
What
TCPv4 GSO frag_off check does not properly validate packet header boundaries.
Who is affected
Systems processing IPv4 packets with generic segmentation offload.
Urgency
Medium severity; memory corruption risk but not currently exploited.
Action
Apply patch using skb_header_pointer() for safe TCPv4 GSO frag_off validation.

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
medium — CVSS 5.5
Published
2026-08-06
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-43036

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-2026-43036coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

Recent advisories for net

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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