wifi: mac80211: count only matching reservations in reserved switch
CVSS score
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EPSS probability
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Risk score
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Published
16 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 use-after-free vulnerability exists in the Linux kernel wifi: mac80211 subsystem because ieee80211_vif_use_reserved_switch() handles reservations too broadly. The patch status is UNKNOWN according to the records.
This vulnerability can lead to memory management errors that result in instability through a use-after-free condition during later beacon generation.
What should be done?
- Follow vendor security advisories
- Apply kernel updates
Chain of evidence and sources
Linux çekirdeği wifi mac80211 alt sisteminde, ieee80211_vif_use_reserved_switch() fonksiyonu rezervasyonları çok geniş ele almaktadır.
Bu durum, daha sonraki beacon üretimi sırasında use-after-free durumuna yol açabilir.
Show the technical text from the sources
In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: count only matching reservations in reserved switch ieee80211_vif_use_reserved_switch() validates a replacement by counting assigned links on ctx->replace_ctx and treating reservations too broadly. A link can still be assigned to the old channel context while holding a reservation that belongs to a different replacement operation. That can make the current replacement appear complete too early. If another link finalizes first, the function can free the WILL_BE_REPLACED chanctx while the unmatched link and driver still use it, leading to a use-after-free in later beacon generation. Require an in-place reservation to point at the current replacement context, and require the reserved and assigned contexts to be the matching replacement pair, before counting or moving the link.
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-2026-98709 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-2026-98709 weaknesses.
Official Sources and Advisories
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