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CVE-2026-23276: net: add xmit recursion limit to tunnel xmit functions

mediumCVSS 5.5CVE-2026-23276

CSIRTS triage

vendor: Linuxproduct: Linux KernelDenial of service
What
Network tunnel transmit functions lack recursion limits.
Who is affected
Linux systems using tunnel network interfaces.
Urgency
Medium priority; CVSS 5.5 indicates moderate denial-of-service potential.
Action
Apply kernel patch adding transmit recursion limits to tunnel functions.

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-2026-23276

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-2026-23276coverage & 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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