{"apiVersion":"1.0","identifier":"CVE-2026-74496","description":"In the Linux kernel, the following vulnerability has been resolved: fou: Fix use-after-free in fou_create() fou_create() publishes struct fou through sk_user_data before adding the new FOU port to the per-netns list. If fou_add_to_port_list() fails, the error path frees fou while it is still reachable through sk_user_data. A concurrent receive can then dereference the freed object in fou_from_sock(). This ordering issue was previously noted in the linked discussion. The failure is reachable when local port 0 is requested. Each socket binds to a different ephemeral port, but fou_cfg_cmp() compares the requested port 0 and reports -EALREADY once an entry already exists. Release the tunnel socket before freeing fou so sk_user_data is cleared first, and defer reclamation with kfree_rcu() to protect concurrent RCU readers. This matches the lifetime handling in fou_release().","publishedAt":"2026-08-15T13:17:54","lastModifiedAt":"2026-08-17T06:19:45","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-74496","cvssScore":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","epssProbability":0.0012,"riskScore":0.79,"affectedProduct":"Linux kernel","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-74496","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-74496","en":"https://www.redsauce.net/en/cves/CVE-2026-74496","fr":"https://www.redsauce.net/fr/cves/CVE-2026-74496","pt":"https://www.redsauce.net/pt/cves/CVE-2026-74496","de":"https://www.redsauce.net/de/cves/CVE-2026-74496","sk":"https://www.redsauce.net/sk/cves/CVE-2026-74496","el":"https://www.redsauce.net/el/cves/CVE-2026-74496"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-74496"}}