wifi: mac80211: reset the AP_VLAN tailroom counter on ifdown
CVSS score
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EPSS probability
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Risk score
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Published
10 h ago
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Vulnerability description
CVE AI research
DayBreach AI Explanation
Verified against sourcesSources read
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Source agreement
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Evidence confidence
%63
Short explanation
A vulnerability has been resolved in the Linux kernel mac80211 subsystem where the AP_VLAN tailroom counter is not reset on ifdown.
Repeated activation of interfaces can cause counter inconsistencies, potentially triggering sanity check warnings.
What should be done?
- Follow vendor advisories
- Apply kernel updates
Chain of evidence and sources
AP_VLAN arayüzleri ifup sırasında crypto_tx_tailroom_needed_cnt değerini alır ancak AP kapatılmadıkça bu değer azaltılmaz.
Aynı AP_VLAN arayüzünün tekrar açılması sayacın artmasına ve WARN_ON_ONCE kontrolünün tetiklenmesine yol açar.
Show the technical text from the sources
In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: reset the AP_VLAN tailroom counter on ifdown On ifup, AP_VLAN interfaces get crypto_tx_tailroom_needed_cnt from the AP interface, but it's never decremented again unless the AP is also brought down. Thus, bringing the same AP_VLAN up again will increment the counter again and eventually hit the sanity check: WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt != master->crypto_tx_tailroom_needed_cnt); Reset it on ifdown to avoid that.
Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.
IMPACT: Affected Products and Software
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
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| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| The sources have not yet published a verified CVSS metric. | ||||
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-98422 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-98422 weaknesses.
Official Sources and Advisories
Yama durumu bilinmiyor
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