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CVE-2025-38248: bridge: mcast: Fix use-after-free during router port configuration

highCVSS 7.6CVE-2025-38248

CSIRTS triage

vendor: Linuxproduct: Linux kernelMemory corruption
What
Bridge multicast router port configuration contains a use-after-free vulnerability in the network stack.
Who is affected
Linux systems running bridge networking with multicast features on affected kernel versions.
Urgency
High priority; use-after-free can lead to code execution or denial of service.
Action
Update to a patched Linux kernel version with corrected router port configuration handling.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 7.6
Published
2026-08-06
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-38248

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-2025-38248coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

Recent advisories for bridge

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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