CVE-2026-63834: batman-adv: tp_meter: restrict number of unacked list entries

mediumCVSS 5.5CVE-2026-63834

CSIRTS triage

vendor: Linux product: batman-advOther

What: This vulnerability restricts the number of unacked list entries in tp_meter.
Who is affected: Deployments using the batman-adv protocol.
Urgency: Remediation is necessary to prevent potential issues, although exploitation is not currently reported.
Action: Restrict the number of unacked list entries in tp_meter.

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: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-63834

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-2026-638340.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-63834	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

Recent advisories for batman-adv

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-2026-64218: In the Linux kernel, the following vulnerability has been resolved: batman-adv: bla: fix repor…nvd · 2026-07-24
highCVE-2026-64096: In the Linux kernel, the following vulnerability has been resolved: batman-adv: mcast: fix use…nvd · 2026-07-19
highCVE-2026-64095: In the Linux kernel, the following vulnerability has been resolved: batman-adv: bla: avoid dou…nvd · 2026-07-19
unknownCVE-2026-64094: In the Linux kernel, the following vulnerability has been resolved: batman-adv: bla: avoid NUL…nvd · 2026-07-19
highCVE-2026-64093: In the Linux kernel, the following vulnerability has been resolved: batman-adv: tp_meter: dire…nvd · 2026-07-19
unknownCVE-2026-64092: In the Linux kernel, the following vulnerability has been resolved: batman-adv: tp_meter: fix …nvd · 2026-07-19