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CVE-2026-46273: ibmveth: Disable GSO for packets with small MSS

mediumCVSS 5.5CVE-2026-46273

CSIRTS triage

vendor: IBMproduct: ibmvethOther
What
The vulnerability involves disabling GSO for packets with small MSS.
Who is affected
Deployments using the ibmveth driver.
Urgency
Remediation is medium urgency due to the medium severity rating.
Action
Update the ibmveth driver to the latest version.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
medium — CVSS 5.5
Published
2026-06-09
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-46273

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-2026-46273coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

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