{"apiVersion":"1.0","identifier":"CVE-2026-74325","description":"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).","publishedAt":"2026-08-15T06:22:33","lastModifiedAt":"2026-08-17T06:19:26","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-74325","cvssScore":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","epssProbability":0.00127,"riskScore":0.79,"affectedProduct":"Linux kernel","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-74325","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-74325","en":"https://www.redsauce.net/en/cves/CVE-2026-74325","fr":"https://www.redsauce.net/fr/cves/CVE-2026-74325","pt":"https://www.redsauce.net/pt/cves/CVE-2026-74325","de":"https://www.redsauce.net/de/cves/CVE-2026-74325","sk":"https://www.redsauce.net/sk/cves/CVE-2026-74325","el":"https://www.redsauce.net/el/cves/CVE-2026-74325"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-74325"}}