wifi: mt76: use kfree_rcu for offchannel link in mt76_put_vif_phy_link

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74325
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:33 UTC
Updated2026-08-15 06:22:33 UTC
DescriptionIn 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).

Risk And Classification

EPSS: 0.001660000 probability, percentile 0.062580000 (date 2026-08-15)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a8f424c1287cc79a06c21816658feea87dfcb83f c7a83899203ed36696a2d35ddd03c0f522874a63 git Not specified
CNA Linux Linux affected a8f424c1287cc79a06c21816658feea87dfcb83f 50e700ac0edce72dee5c3a9755865d9423696ac7 git Not specified
CNA Linux Linux affected a8f424c1287cc79a06c21816658feea87dfcb83f 7fae097aa9a56c30febf539d72ef3773165d3aa3 git Not specified
CNA Linux Linux affected 6.14 Not specified
CNA Linux Linux unaffected 6.14 semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/7fae097aa9a56c30febf539d72ef3773165d3aa3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/50e700ac0edce72dee5c3a9755865d9423696ac7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c7a83899203ed36696a2d35ddd03c0f522874a63 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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