CVE-2024-38574

En el kernel de Linux, se resolvió la siguiente vulnerabilidad: libbpf: evita la desreferencia del puntero nulo cuando el programa a cargar no tiene BTF. En bpf_objec_load_prog(), no hay garantía de que obj->btf no sea NULL al pasarlo a btf__fd() , y esta función no realiza ninguna verificación antes de eliminar la referencia a su argumento (como solía hacer bpf_object__btf_fd()). Como consecuencia, obtenemos errores de segmentación en bpftool (por ejemplo) cuando intentamos cargar programas que vienen sin información BTF. v2: Mantenga btf__fd() en la solución en lugar de volver a bpf_object__btf_fd().

In the Linux kernel, the following vulnerability has been resolved: libbpf: Prevent null-pointer dereference when prog to load has no BTF In bpf_objec_load_prog(), there's no guarantee that obj->btf is non-NULL when passing it to btf__fd(), and this function does not perform any check before dereferencing its argument (as bpf_object__btf_fd() used to do). As a consequence, we get segmentation fault errors in bpftool (for example) when trying to load programs that come without BTF information. v2: Keep btf__fd() in the fix instead of reverting to bpf_object__btf_fd().

Benedict Schlüter, Supraja Sridhara, Andrin Bertschi, and Shweta Shinde discovered that an untrusted hypervisor could inject malicious #VC interrupts and compromise the security guarantees of AMD SEV-SNP. This flaw is known as WeSee. A local attacker in control of the hypervisor could use this to expose sensitive information or possibly execute arbitrary code in the trusted execution environment. Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system.