{"id":"GHSA-3qx8-rv27-j6gp","summary":"Undefined behaviour in `kvm_ioctls::ioctls::vm::VmFd::create_device`","details":"An issue was identified in the `VmFd::create_device function`, leading to undefined behavior and miscompilations on rustc 1.82.0 and newer due to the function's violation of Rust's pointer safety rules.\n\nThe function downcasted a mutable reference to its `struct kvm_create_device` argument to an immutable pointer, and then proceeded to pass this pointer to a mutating system call. Rustc 1.82.0 and newer elides subsequent reads of this structure's fields, meaning code will not see the value written by the kernel into the `fd` member. Instead, the code will observe the value that this field was initialized to prior to calling `VmFd::create_device` (usually, 0).\n\nThe issue started in kvm-ioctls 0.1.0 and was fixed in 0.19.1 by correctly using\na mutable pointer.\n","aliases":["RUSTSEC-2024-0428"],"modified":"2025-10-28T06:29:22.787282Z","published":"2024-12-23T19:26:37Z","database_specific":{"github_reviewed_at":"2024-12-23T19:26:37Z","nvd_published_at":null,"cwe_ids":["CWE-843"],"severity":"MODERATE","github_reviewed":true},"references":[{"type":"WEB","url":"https://github.com/rust-vmm/kvm/pull/298"},{"type":"PACKAGE","url":"https://github.com/rust-vmm/kvm-ioctls"},{"type":"WEB","url":"https://rustsec.org/advisories/RUSTSEC-2024-0428.html"}],"affected":[{"package":{"name":"kvm-ioctls","ecosystem":"crates.io","purl":"pkg:cargo/kvm-ioctls"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.19.1"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2024/12/GHSA-3qx8-rv27-j6gp/GHSA-3qx8-rv27-j6gp.json"}}],"schema_version":"1.9.0"}