wifi: mac80211: shut down RX BA session timer on teardown
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EPSS probability
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Risk score
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Published
9 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 identified in the Linux kernel wifi mac80211 subsystem where RX BA session teardown can cause timer operations to access freed memory.
The lack of synchronization between session teardown and RCU critical sections can lead to timer operations targeting freed memory, risking system instability.
What should be done?
- Monitor vendor advisories and stable kernel updates
- Apply the corresponding kernel patches
Chain of evidence and sources
RX BA oturumlarının sonlandırılması, zamanlayıcının serbest bırakılmış bir tid_rx üzerinde kuyrukta kalmasına neden olabilir.
Yeniden etkinleştirme girişimlerini önlemek için timer_shutdown_sync() fonksiyonu kullanılmalıdır.
Show the technical text from the sources
In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: shut down RX BA session timer on teardown Tearing down an RX BA session can leave the session timer queued on a freed tid_rx. Later timer-wheel processing and the timer callback itself then run against freed memory. An RX BAR handler can dereference tid_rx under RCU before teardown unpublishes it and stay in its read-side critical section while teardown deletes the session timer. The stale handler can then rearm the timer after timer_delete_sync() returns and before the RCU callback frees tid_rx. Use timer_shutdown_sync() so rearm attempts become ineffective once teardown starts. Keep reorder_timer unchanged: teardown marks the session removed under reorder_lock and its release path checks that state before rearming. session_timer has no equivalent guard because ieee80211_rx_h_ctrl() rearms it before taking reorder_lock.
Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.
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SCORING: CVSS from Multiple Sources
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Patch and Remediation Guide
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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-2026-98707 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-2026-98707 weaknesses.
Official Sources and Advisories
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