CVE-2026-80838Hinoki check available

Invalid kernel memory access via VXLAN FDB race

Published Sep 4, 2026 · Updated Sep 4, 2026

Race condition in Linux kernel VXLAN 6.7 and later affected branches allows attackers to trigger invalid kernel memory access. vxlan_fdb_dst_destroy() unlinks the last remote before vxlan_flush() removes the parent FDB entry, so first_remote_rcu() derives an invalid pointer from an empty list head. Reachability requires a filtered bulk flush matching every remote while an RCU receive-learning reader accesses the still-indexed parent; the published record does not establish code execution or privilege escalation.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Race condition in Linux kernel VXLAN 6.7 and later affected branches allows attackers to trigger invalid kernel memory access. vxlan_fdb_dst_destroy() unlinks the last remote before vxlan_flush() removes the parent FDB entry, so first_remote_rcu() derives an invalid pointer from an empty list head. Reachability requires a filtered bulk flush matching every remote while an RCU receive-learning reader accesses the still-indexed parent; the published record does not establish code execution or privilege escalation.

The record

CVE
CVE-2026-80838
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 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?

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  1. Affected versionversion=6.7
  2. Affected versionversion=c499fccb71cb85902b5c5b9ce9c9ae6683e54a8f <2a7c2f00843225d5f037676bca649321f3d024c7
  3. Affected versionversion=c499fccb71cb85902b5c5b9ce9c9ae6683e54a8f <4bbc76ee1b21d3bd045d6d819b2bacd30a6372ab
  4. Affected versionversion=c499fccb71cb85902b5c5b9ce9c9ae6683e54a8f <8ba68fd6cdd1e3c92b92f25c7e48bf7bd51a183c
  5. Affected versionversion=c499fccb71cb85902b5c5b9ce9c9ae6683e54a8f <a8820c8a7718327e96849782033e7c85a0f6bcfe
  6. Affected versionversion=c499fccb71cb85902b5c5b9ce9c9ae6683e54a8f <d5d4a7b538b52db63927773a8905fcd9f78a42e2

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.7; version=c499fccb71cb85902b5c5b9ce9c9ae6683e54a8f <2a7c2f00843225d5f037676bca649321f3d024c7; version=c499fccb71cb85902b5c5b9ce9c9ae6683e54a8f <4bbc76ee1b21d3bd045d6d819b2bacd30a6372ab; version=c499fccb71cb85902b5c5b9ce9c9ae6683e54a8f <8ba68fd6cdd1e3c92b92f25c7e48bf7bd51a183c; version=c499fccb71cb85902b5c5b9ce9c9ae6683e54a8f <a8820c8a7718327e96849782033e7c85a0f6bcfe; version=c499fccb71cb85902b5c5b9ce9c9ae6683e54a8f <d5d4a7b538b52db63927773a8905fcd9f78a42e2

Published CVSS scores

No CVSS assessment is available in this record.

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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