In the Linux kernel, the following vulnerability has been resolved: wifi: rtlwifi: rtl8192du: check QoS TID before indexing tids… (CVE-2026-80943)
A vulnerability in the Linux kernel's rtlwifi driver for rtl8192du was resolved. The issue involved improper bounds checking of the QoS TID value used as an index into an array, which could lead to out-of-bounds access. The flaw was detected by static analysis and confirmed by manual audit and UBSAN validation. The fix ensures that out-of-range TIDs use a default safe state, preventing array indexing beyond allocated bounds.
AI Analysis
Technical Summary
The rtlwifi driver in the Linux kernel for the rtl8192du device used ieee80211_get_tid() to obtain a QoS TID value from the 802.11 header, which can range from 0 to 15. This value was then used as an index into sta_entry->tids[], an array allocated with only 9 entries (MAX_TID_COUNT=9). Consequently, TID values greater than 8 caused out-of-bounds array access. The vulnerability was identified by static analysis and confirmed by manual code review and UBSAN testing, which reported an array-index-out-of-bounds error at index 10. The patch applies a check to keep the default RTL_AGG_STOP state for out-of-range TIDs, aligning with behavior in rtl92cu_tx_fill_desc().
Potential Impact
The vulnerability could cause out-of-bounds memory access in the rtlwifi driver, potentially leading to memory corruption or kernel instability. No active exploits are known. The impact is limited to affected kernel versions using the rtl8192du driver with this flaw.
Mitigation Recommendations
A fix has been applied to the Linux kernel to check the QoS TID before indexing the tids array, preventing out-of-bounds access. Users should update to a kernel version that includes this patch. No additional mitigation is required if the fix is applied.
In the Linux kernel, the following vulnerability has been resolved: wifi: rtlwifi: rtl8192du: check QoS TID before indexing tids… (CVE-2026-80943)
Description
A vulnerability in the Linux kernel's rtlwifi driver for rtl8192du was resolved. The issue involved improper bounds checking of the QoS TID value used as an index into an array, which could lead to out-of-bounds access. The flaw was detected by static analysis and confirmed by manual audit and UBSAN validation. The fix ensures that out-of-range TIDs use a default safe state, preventing array indexing beyond allocated bounds.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The rtlwifi driver in the Linux kernel for the rtl8192du device used ieee80211_get_tid() to obtain a QoS TID value from the 802.11 header, which can range from 0 to 15. This value was then used as an index into sta_entry->tids[], an array allocated with only 9 entries (MAX_TID_COUNT=9). Consequently, TID values greater than 8 caused out-of-bounds array access. The vulnerability was identified by static analysis and confirmed by manual code review and UBSAN testing, which reported an array-index-out-of-bounds error at index 10. The patch applies a check to keep the default RTL_AGG_STOP state for out-of-range TIDs, aligning with behavior in rtl92cu_tx_fill_desc().
Potential Impact
The vulnerability could cause out-of-bounds memory access in the rtlwifi driver, potentially leading to memory corruption or kernel instability. No active exploits are known. The impact is limited to affected kernel versions using the rtl8192du driver with this flaw.
Mitigation Recommendations
A fix has been applied to the Linux kernel to check the QoS TID before indexing the tids array, preventing out-of-bounds access. Users should update to a kernel version that includes this patch. No additional mitigation is required if the fix is applied.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-8f9m-rj4x-3w9p
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-80943"]
Threat ID: 6aa4a03155bf5e2cf5a871fc
Added to database: 09/12/2026, 00:43:29 UTC
Last enriched: 09/12/2026, 01:26:31 UTC
Last updated: 09/12/2026, 02:01:37 UTC
Views: 3
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