CVE-2026-74684: net: tap: set skb->dev before parsing virtio net header in tap_get_user_xdp()

mediumCVSS 4.4CVE-2026-74684

CSIRTS triage

vendor: Linux product: Linux kernel Memory corruption

What: The tap driver fails to set skb->dev before parsing virtio net headers in tap_get_user_xdp(), causing potential memory corruption.
Who is affected: Systems using tap networking with virtio, particularly XDP mode deployments.
Urgency: Medium priority; not currently exploited but memory corruption issues can lead to DoS or code execution.
Action: Apply kernel patch fixing skb->dev initialization in tap_get_user_xdp() or update to patched kernel version.

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-2026-74684

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-2026-746840.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 6% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-74684	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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