CVE-2026-72227

Kernel memory disclosure via undersized multicast tracker header

Published Aug 15, 2026 · Updated Aug 15, 2026

Out-of-bounds read in batman-adv multicast forwarding in Linux allows adjacent attackers to disclose kernel memory via a malformed mesh packet. The multicast tracker handler uses offsetof() instead of a whole-header size check, so a zero- or one-byte TVLV payload passes validation before the two-byte num_dests field is read. The target must run an affected kernel with an active batman-adv mesh and multicast optimization; triggering the read can also cause a kernel oops or panic and interrupt mesh service.

CVSS severity8.1
High
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in batman-adv multicast forwarding in Linux allows adjacent attackers to disclose kernel memory via a malformed mesh packet. The multicast tracker handler uses offsetof() instead of a whole-header size check, so a zero- or one-byte TVLV payload passes validation before the two-byte num_dests field is read. The target must run an affected kernel with an active batman-adv mesh and multicast optimization; triggering the read can also cause a kernel oops or panic and interrupt mesh service.

The record

CVE
CVE-2026-72227
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=07afe1ba288c04280622fa002ed385f1ac0b6fe6 <38eaed28e250895d56f4b7989bd65479a511c5c3
  2. Affected versionversion=07afe1ba288c04280622fa002ed385f1ac0b6fe6 <7d1a877670bc2e901241073f022ca8d1b2f85f1c
  3. Affected versionversion=07afe1ba288c04280622fa002ed385f1ac0b6fe6 <80f62893d135f415e7a374dd47b468ec298f7aed
  4. Affected versionversion=07afe1ba288c04280622fa002ed385f1ac0b6fe6 <d2b657c9653fcebca828a2ead13f444e0da68817
  5. Affected versionversion=6.8

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=07afe1ba288c04280622fa002ed385f1ac0b6fe6 <38eaed28e250895d56f4b7989bd65479a511c5c3; version=07afe1ba288c04280622fa002ed385f1ac0b6fe6 <7d1a877670bc2e901241073f022ca8d1b2f85f1c; version=07afe1ba288c04280622fa002ed385f1ac0b6fe6 <80f62893d135f415e7a374dd47b468ec298f7aed; version=07afe1ba288c04280622fa002ed385f1ac0b6fe6 <d2b657c9653fcebca828a2ead13f444e0da68817; version=6.8

Published CVSS scores

8.1Linux CNACVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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