CVE-2026-74615: vxlan: do not arm the ageing timer on a device that is down

mediumCVSS 4.4CVE-2026-74615

CSIRTS triage

Other

What: The ageing timer is incorrectly armed on a vxlan device that is administratively down.
Who is affected: Systems using vxlan with devices that are brought down while the ageing timer would be active.
Urgency: Medium severity; no active exploitation reported, but timer mismanagement can cause unexpected behavior.
Action: Apply the kernel patch that prevents arming the ageing timer on down devices.

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

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-2026-74615

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-2026-746150.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-74615	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

Recent advisories for vxlan

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-2026-74615: In the Linux kernel, the following vulnerability has been resolved: vxlan: do not arm the agei…nvd · 2026-08-22
criticalCVE-2026-74475: In the Linux kernel, the following vulnerability has been resolved: vxlan: use neigh_ha_snapsh…nvd · 2026-08-15
criticalCVE-2026-74474: In the Linux kernel, the following vulnerability has been resolved: vxlan: use pskb_network_ma…nvd · 2026-08-15
criticalCVE-2026-74473: In the Linux kernel, the following vulnerability has been resolved: vxlan: use pskb_network_ma…nvd · 2026-08-15
criticalCVE-2026-74406: In the Linux kernel, the following vulnerability has been resolved: vxlan: Fix potential null-…nvd · 2026-08-15
highCVE-2026-68432: In the Linux kernel, the following vulnerability has been resolved: vxlan: require CAP_NET_ADM…nvd · 2026-08-12