CVE-2024-38574: libbpf: Prevent null-pointer dereference when prog to load has no BTF
Description
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().
Classification
CVE ID: CVE-2024-38574
Affected Products
Vendor: Linux
Product: Linux
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.04% (probability of being exploited)
EPSS Percentile: 5.08% (scored less or equal to compared to others)
EPSS Date: 2025-02-04 (when was this score calculated)
References
https://git.kernel.org/stable/c/ef80b59acfa4dee4b5eaccb15572b69248831104https://git.kernel.org/stable/c/1fd91360a75833b7110af9834ae26c977e1273e0
https://git.kernel.org/stable/c/9bf48fa19a4b1d186e08b20bf7e5de26a15644fb