{"apiVersion":"1.0","identifier":"CVE-2026-72254","description":"In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_fib: reject fib expression on the netdev egress hook A fib expression in a netdev egress base chain dereferences nft_in(pkt), NULL on the transmit path, causing a NULL pointer dereference at eval. nft_fib_validate() masks the hook with NF_INET_* values, but netdev hook numbers are a separate enum that aliases them (NF_NETDEV_EGRESS == NF_INET_LOCAL_IN), so an egress chain passes validation and then faults. Add nft_fib_netdev_validate() that limits each result/flag to the netdev hook where the device it reads exists: the input-device cases (OIF, OIFNAME, ADDRTYPE with F_IIF) to ingress, the output-device case (ADDRTYPE with F_OIF) to egress, ADDRTYPE with no device flag to both. Also restrict nft_fib_validate() to NFPROTO_IPV4/IPV6/INET so its NF_INET_* masks are not applied to another family-s hooks.","publishedAt":"2026-08-15T06:21:52","lastModifiedAt":"2026-08-17T06:18:27","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-72254","cvssScore":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","epssProbability":0.00595,"riskScore":0.79,"affectedProduct":"Linux kernel","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-72254","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-72254","en":"https://www.redsauce.net/en/cves/CVE-2026-72254","fr":"https://www.redsauce.net/fr/cves/CVE-2026-72254","pt":"https://www.redsauce.net/pt/cves/CVE-2026-72254","de":"https://www.redsauce.net/de/cves/CVE-2026-72254","sk":"https://www.redsauce.net/sk/cves/CVE-2026-72254","el":"https://www.redsauce.net/el/cves/CVE-2026-72254"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-72254"}}