CVE-2026-72227
Linux batman-adv parsing bug allows kernel out-of-bounds read of multicast header.
Is CVE-2026-72227 being exploited?
Not confirmed. CVE-2026-72227 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.33% probability of exploitation in the next 30 days.
How severe is CVE-2026-72227?
CVE-2026-72227 is rated High with a CVSS score of 8.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-72227?
Yes. A fix has been recorded for CVE-2026-72227. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-72227 affect?
CVE-2026-72227 affects Linux kernel (batman-adv module), Embedded mesh routers using batman-adv, Distributions with affected kernel builds. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-72227?
Apply vendor kernel updates or disable the batman-adv module until patched.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Crafted multicast frames can trigger a kernel out-of-bounds read causing information disclosure or crash (DoS) via batman-adv packet parsing.
Patch when possible
- affected>= 07afe1ba288c04280622fa002ed385f1ac0b6fe6 and < 80f62893d135f415e7a374dd47b468ec298f7aed
- affected>= 07afe1ba288c04280622fa002ed385f1ac0b6fe6 and < d2b657c9653fcebca828a2ead13f444e0da68817
- affected>= 07afe1ba288c04280622fa002ed385f1ac0b6fe6 and < 7d1a877670bc2e901241073f022ca8d1b2f85f1c
- affected>= 07afe1ba288c04280622fa002ed385f1ac0b6fe6 and < 38eaed28e250895d56f4b7989bd65479a511c5c3
- affected6.8
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.