{"apiVersion":"1.0","identifier":"CVE-2026-74740","description":"In the Linux kernel, the following vulnerability has been resolved: net/sched: act_api: fix TOCTOU NULL deref on a->goto_chain tcf_action_exec() handles TC_ACT_GOTO_CHAIN by first checking rcu_access_pointer(a->goto_chain) and then calling tcf_action_goto_chain_exec(), which does a second, independent rcu_dereference_bh(a->goto_chain) read and immediately dereferences chain->filter_chain. A concurrent tcf_action_set_ctrlact() (e.g. the gact replace path) can clear a->goto_chain between the two reads, so the second read returns NULL and tcf_action_goto_chain_exec() dereferences NULL. Fix the race by doing a single rcu_dereference_bh() read of a->goto_chain in tcf_action_exec(), checking it once for NULL, and passing the resulting chain pointer into tcf_action_goto_chain_exec(). This turns the split check/use into a single check/use on one value.","publishedAt":"2026-08-26T15:16:52","lastModifiedAt":"2026-08-26T15:16:52","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-74740","cvssScore":null,"cvssVector":"Pending","epssProbability":0.00175,"riskScore":0,"affectedProduct":"Linux kernel","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-74740","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-74740","en":"https://www.redsauce.net/en/cves/CVE-2026-74740","fr":"https://www.redsauce.net/fr/cves/CVE-2026-74740","pt":"https://www.redsauce.net/pt/cves/CVE-2026-74740","de":"https://www.redsauce.net/de/cves/CVE-2026-74740","sk":"https://www.redsauce.net/sk/cves/CVE-2026-74740","el":"https://www.redsauce.net/el/cves/CVE-2026-74740"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-74740"}}