CVE-2026-64569: mpls: fix NULL deref in mpls_valid_fib_dump_req() on CONFIG_INET=n

mediumCVSS 5.5CVE-2026-64569

CSIRTS triage

product: Linux kernel (mpls module)Denial of service

What: NULL pointer dereference in mpls_valid_fib_dump_req() on systems with CONFIG_INET disabled causes kernel panic.
Who is affected: Linux systems with MPLS module enabled and CONFIG_INET=n configuration dumping MPLS FIB.
Urgency: Medium urgency; denial of service via kernel crash is possible but requires specific kernel configuration and network operation.
Action: Apply Linux kernel patch addressing NULL pointer check in mpls_valid_fib_dump_req() or ensure CONFIG_INET=y in kernel build.

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

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64569

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-2026-645690.16% 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-2026-64569	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

medium[UPDATE] [medium] Linux Kernel: Multiple vulnerabilitiescert-bund
unknownMultiple vulnerabilities in Debian Linux kernel (August 14, 2026)cert-fr-avis
unknownDSA-6415-1 linux - security updatedebian
unknownCVE-2026-64569: In the Linux kernel, the following vulnerability has been resolved: mpls: fix NULL deref in mp…nvd

Recent advisories for mpls

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.

unknownCVE-2026-74577: In the Linux kernel, the following vulnerability has been resolved: net: mpls: initialize rtm_…nvd · 2026-08-15
lowCVE-2026-74577: net: mpls: initialize rtm_tos in mpls_getroute()msrc · 2026-08-11
highCVE-2026-43042: mpls: add seqcount to protect the platform_label{,s} pairmsrc · 2026-08-06
unknownCVE-2026-64569: In the Linux kernel, the following vulnerability has been resolved: mpls: fix NULL deref in mp…nvd · 2026-08-05