CVE-2026-64580: xfrm6: clear dst.dev on error to avoid double netdev_put in xfrm6_fill_dst()

mediumCVSS 4.1CVE-2026-64580

CSIRTS triage

vendor: Linux product: Linux kernel Denial of service

What: Missing dst.dev clearing on error in xfrm6_fill_dst() causes double netdev_put leading to reference count corruption.
Who is affected: Linux systems using IPv6 IPsec functionality with xfrm6 module loaded.
Urgency: Medium urgency; may cause kernel panic or resource leaks when xfrm6 error paths are triggered.
Action: Apply Linux kernel patch that clears dst.dev on error in xfrm6_fill_dst().

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 4.1
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64580

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-2026-645800.12% 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-2026-64580	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

unknownMultiple vulnerabilities in Debian Linux kernel (August 14, 2026)cert-fr-avis
medium[UPDATE] [medium] Linux Kernel: Multiple vulnerabilitiescert-bund
unknownDSA-6415-1 linux - security updatedebian
highCVE-2026-64580: In the Linux kernel, the following vulnerability has been resolved: xfrm6: clear dst.dev on er…nvd

Recent advisories for xfrm6

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-2026-64580: In the Linux kernel, the following vulnerability has been resolved: xfrm6: clear dst.dev on er…nvd · 2026-08-05