VulnerabilityPublished 19 Jul 2026

CVE-2026-63835: Linux kernel · batman-adv: v: prevent OGM aggregation on disabled hardif

Source GCVE Database

Not known to be exploited.

Data as of 26 Oct 2026, 14:05 UTC

Severity

Medium

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS: 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

Disclosed: evidence found.
CVE published 19 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-vcwj-xjx6-gq5q

What to do

Description

A vulnerability in the Linux kernel's batman-adv component could lead to a memory leak when an interface is disabled. Specifically, the system fails to block new packet buffers (skbs) from being queued on a disabled interface, causing these buffers to never be freed or processed. This issue has been resolved by ensuring that queuing is blocked when the interface is disabled.

Impact

This vulnerability causes a resource leak (memory leak) in the Linux kernel's batman-adv networking component when interfaces are disabled. While it does not directly indicate code execution or denial of service, the leak could degrade system performance or stability over time if exploited.

Summary

The Linux kernel's batman-adv module had a flaw where, after disabling a network interface, the function batadv_v_ogm_send_meshif() could still queue new skbs to the aggregation list. Since the aggregation list is freed during interface disablement, these newly queued skbs are neither freed nor consumed, resulting in a memory leak. The fix involves blocking the queuing function batadv_v_ogm_queue_on_if() during interface disablement to prevent this leak.

References

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