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CVE-2026-53013: macvlan: fix macvlan_get_size() not reserving space for IFLA_MACVLAN_BC_CUTOFF

mediumCVSS 5.5CVE-2026-53013

CSIRTS triage

vendor: Linuxproduct: macvlanOther
What
The function macvlan_get_size() does not reserve space for IFLA_MACVLAN_BC_CUTOFF.
Who is affected
Deployments using the macvlan feature in Linux.
Urgency
Remediation is medium urgency due to the medium severity and lack of exploitation status.
Action
Update to the latest version of the Linux kernel that includes the fix.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
medium — CVSS 5.5
Published
2026-06-09
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53013

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-2026-53013coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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