Answer in brief
CVE-2026-74325 records a High severity (CVSS 7.8) vulnerability in wifi: mt76: use kfree_rcu for offchannel link in mt76_put_vif_phy_link. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=a8f424c1287cc79a06c21816658feea87dfcb83f <c7a83899203ed36696a2d35ddd03c0f522874a63 || >=a8f424c1287cc79a06c21816658feea87dfcb83f <50e700ac0edce72dee5c3a9755865d9423696ac7 || >=a8f424c1287cc79a06c21816658feea87dfcb83f <7fae097aa9a56c30febf539d72ef3773165d3aa3 | c7a83899203ed36696a2d35ddd03c0f522874a63, 50e700ac0edce72dee5c3a9755865d9423696ac7, 7fae097aa9a56c30febf539d72ef3773165d3aa3 |
| Linux/Linuxgeneric | 6.14 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: use kfree_rcu for offchannel link in mt76_put_vif_phy_link mt76_put_vif_phy_link() frees the offchannel mlink with plain kfree() after rcu_assign_pointer(NULL). However, rcu_assign_pointer only prevents future RCU readers from obtaining the pointer -- it does not wait for existing readers that already hold it via rcu_dereference. The TX datapath (e.g. mt7996_mac_write_txwi) dereferences mlink->wcid and mlink->idx under rcu_read_lock. If a TX softirq obtained the pointer via rcu_dereference just before the NULL assignment, it will dereference freed memory after the kfree. struct mt76_vif_link already contains an rcu_head field that is unused at this free site -- a developer oversight, since the adjacent kfree_rcu_mightsleep call for rx_sc in the same function shows the pattern was understood. Replace kfree(mlink) with kfree_rcu(mlink, rcu_head).
Quoted source text, attributed separately from HOL analysis.