CVE-2022-49873

CVE-2022-49873 · bpf: Fix wrong reg type conversion in release_reference()

Cette page présente des faits issus de sources publiques. Consultez l’avis original avant toute mise à jour.

Cette page présente une partie des faits des sources. Consultez les avis liés pour la description complète et les versions concernées.

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix wrong reg type conversion in release_reference() Some helper functions will allocate memory. To avoid memory leaks, the verifier requires the eBPF program to release these memories by calling the corresponding helper functions. When a resource is released, all pointer registers corresponding to the resource should be invalidated. The verifier use release_references() to do this job, by apply __mark_reg_unknown() to each relevant register. It will give these registers the type of SCALAR_VALUE. A register that will contain a pointer value at runtime, but of type SCALAR_VALUE, which may allow the unprivileged user to get a kernel pointer by storing this register into a map. Using __mark_reg_not_init() while NOT allow_ptr_leaks can mitigate this problem.

CVSS 5.5 · Moyenne · EPSS 0,2% · Correctif disponible

Publication

2025-05-01T14:10:23.128Z

Mise à jour

2026-05-11T19:08:23.688Z

Pile logicielle: system

Vérifiez votre serveur →