# CVE-2026-80943

## Summary

- **CVE ID:** CVE-2026-80943
- **Severity:** HIGH
- **CVSS Score:** 7.6 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H)
- **CWE:** N/A
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 13, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:

wifi: rtlwifi: rtl8192du: check QoS TID before indexing tids

rtl92du_tx_fill_desc() uses ieee80211_get_tid() to read the QoS TID
from the 802.11 header and then uses it as an index into
sta_entry->tids[]. ieee80211_get_tid() returns the low 4-bit QoS TID
value, so the result can be in the range 0..15.

rtlwifi only allocates MAX_TID_COUNT entries for sta_entry->tids[], and
MAX_TID_COUNT is 9. A QoS TID greater than 8 therefore indexes past the
aggregation state array. Keep the default RTL_AGG_STOP state for
out-of-range TIDs, matching rtl92cu_tx_fill_desc().

This issue was detected by our static analysis tool and confirmed by
manual audit. UBSAN validation for the same bug pattern reports an
array-index-out-of-bounds access with index 10 for type
'rtl_tid_data [9]'.

## Affected Products

- Linux — Linux (8321424134a400a5e3eb39f9acca6bc6946ff447)
- Linux — Linux (6.11)
- Linux — Linux (0)
- Linux — Linux (6.12.109)
- Linux — Linux (6.18.50)
- Linux — Linux (7.2.4)
- Linux — Linux (7.3-rc1)

## References

- [CNA](https://git.kernel.org/stable/c/6e327f14e1c43e175bf530f9165b2cadff308553)
- [CNA](https://git.kernel.org/stable/c/0c0b374e12d52af23ca741728db31091677cf9dc)
- [CNA](https://git.kernel.org/stable/c/42785f7e8d31540e6172bbcf08a7cc3cae1086f8)
- [CNA](https://git.kernel.org/stable/c/ed4f05d9f2f42fd866f55108db8123eefcc5fb33)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.25%
- **EPSS Percentile:** 16.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._