CVE-2026-98822

VLAN isolation bypass via BSS-wide station lookup

Published Oct 18, 2026 · Updated Oct 18, 2026

VLAN isolation failure in Linux mac80211 allows attackers to send unicast traffic across VLANs through an affected access point. In net/mac80211/tx.c, ieee80211_lookup_ra_sta() uses sta_info_get_bss() for ordinary AP and AP VLAN frames, selecting destination stations outside the transmitting interface. Exposure requires AP VLAN interfaces sharing a BSS and traffic addressed to a station on another VLAN; the documented consequence is unintended cross-VLAN delivery, not code execution or a kernel crash.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

VLAN isolation failure in Linux mac80211 allows attackers to send unicast traffic across VLANs through an affected access point. In net/mac80211/tx.c, ieee80211_lookup_ra_sta() uses sta_info_get_bss() for ordinary AP and AP VLAN frames, selecting destination stations outside the transmitting interface. Exposure requires AP VLAN interfaces sharing a BSS and traffic addressed to a station on another VLAN; the documented consequence is unintended cross-VLAN delivery, not code execution or a kernel crash.

The record

CVE
CVE-2026-98822
Published
Oct 18, 2026
Updated
Oct 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 18, 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=4.1
  2. Affected versionversion=97ffe75791b3e9c0797d5891070e41321c3beccb <7f93ca31f7fd9b42e7d692f59514436d448ac908
  3. Affected versionversion=97ffe75791b3e9c0797d5891070e41321c3beccb <88e96d902efeefbffc34450969f40dc61a0c8a42
  4. Affected versionversion=97ffe75791b3e9c0797d5891070e41321c3beccb <ad61b9a5febb42e4b96df8d30ad76ddc36dda9d0
  5. Affected versionversion=97ffe75791b3e9c0797d5891070e41321c3beccb <fd875e24e8f2b202e3636b3ef8e6060874eca0e5

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=4.1; version=97ffe75791b3e9c0797d5891070e41321c3beccb <7f93ca31f7fd9b42e7d692f59514436d448ac908; version=97ffe75791b3e9c0797d5891070e41321c3beccb <88e96d902efeefbffc34450969f40dc61a0c8a42; version=97ffe75791b3e9c0797d5891070e41321c3beccb <ad61b9a5febb42e4b96df8d30ad76ddc36dda9d0; version=97ffe75791b3e9c0797d5891070e41321c3beccb <fd875e24e8f2b202e3636b3ef8e6060874eca0e5

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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 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.

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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