CVE-2026-74701: net/openvswitch: check Ethernet header length in key_extract()

mediumCVSS 4.4CVE-2026-74701

CSIRTS triage

vendor: Linux product: Linux kernel Denial of service

What: Open vSwitch key extraction does not validate Ethernet header length, causing null pointer dereference.
Who is affected: Deployments running Open vSwitch kernel module.
Urgency: Medium priority; not exploited but impacts availability.
Action: Apply kernel patch to validate Ethernet header length in key_extract().

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 4.4
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-74701

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.

Low exploitation riskCVE-2026-747010.18% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-74701	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

highCVE-2026-74701: In the Linux kernel, the following vulnerability has been resolved: net/openvswitch: check Eth…nvd

Recent advisories for net/openvswitch

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.

highCVE-2026-74701: In the Linux kernel, the following vulnerability has been resolved: net/openvswitch: check Eth…nvd · 2026-08-22