CVE-2022-48929

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix crash due to out of bounds access into reg2btf_ids. When commit e6ac2450d6de ("bpf: Support bpf program calling kernel function") added kfunc support, it defined reg2btf_ids as a cheap way to translate the verifier reg type to the appropriate btf_vmlinux BTF ID, however commit c25b2ae13603 ("bpf: Replace PTR_TO_XXX_OR_NULL with PTR_TO_XXX | PTR_MAYBE_NULL") moved the __BPF_REG_TYPE_MAX from the last member of bpf_reg_type enum to after the base register types, and defined other variants using type flag composition. However, now, the direct usage of reg->type to index into reg2btf_ids may no longer fall into __BPF_REG_TYPE_MAX range, and hence lead to out of bounds access and kernel crash on dereference of bad pointer.

The following products are affected by CVE-2022-48929 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2022-48929.

URL	Resource
https://git.kernel.org/stable/c/45ce4b4f9009102cd9f581196d480a59208690c1
https://git.kernel.org/stable/c/8c39925e98d498b9531343066ef82ae39e41adae
https://git.kernel.org/stable/c/f0ce1bc9e0235dd7412240be493d7ea65ed9eadc
https://lore.kernel.org/linux-cve-announce/2024082222-CVE-2022-48929-857d@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2022-48929
https://www.cve.org/CVERecord?id=CVE-2022-48929