{"apiVersion":"1.0","identifier":"CVE-2026-72112","description":"In the Linux kernel, the following vulnerability has been resolved: io_uring/bpf-ops: reject re-registration of an already-bound ops io_install_bpf() only rejects a second registration on the ctx side (ctx->bpf_ops) and sets the per-map back-pointer ops->priv unconditionally. The struct_ops link path never advances a map past BPF_STRUCT_OPS_STATE_READY, so the same io_uring_bpf_ops map can be registered more than once, and bpf_io_reg() re-resolves the target ring via fget(ops->ring_fd) on every call. A caller can therefore point the same ring_fd at a different io_ring_ctx between two BPF_LINK_CREATE calls. The second registration passes the ctx->bpf_ops check (the new ctx has none) and overwrites ops->priv, orphaning the first ctx. Teardown (io_eject_bpf()/bpf_io_unreg()) only reaches a ctx through ops->priv, so the orphaned ctx is never torn down: its ctx->loop_step keeps pointing into the struct_ops trampoline, which is freed once the map is gone. A later io_uring_enter() on the orphaned ring then calls the dangling ctx->loop_step from io_run_loop() -- a use-after-free of freed executable memory, reachable by a task with CAP_BPF + CAP_PERFMON. Reject registration when ops->priv is already set, as hid_bpf_reg() does for its struct_ops.","publishedAt":"2026-08-15T06:21:25","lastModifiedAt":"2026-08-17T06:18:10","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-72112","cvssScore":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","epssProbability":0.00154,"riskScore":0.79,"affectedProduct":"Linux kernel","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-72112","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-72112","en":"https://www.redsauce.net/en/cves/CVE-2026-72112","fr":"https://www.redsauce.net/fr/cves/CVE-2026-72112","pt":"https://www.redsauce.net/pt/cves/CVE-2026-72112","de":"https://www.redsauce.net/de/cves/CVE-2026-72112","sk":"https://www.redsauce.net/sk/cves/CVE-2026-72112","el":"https://www.redsauce.net/el/cves/CVE-2026-72112"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-72112"}}