CVE-2022-48929 bpf: Fix crash due to out of bounds access into reg2btf_ids.

Medium 5.5 Published 22 Aug 2024 Updated 11 May 2026

A local attacker can trigger a kernel crash via out-of-bounds access in the BPF subsystem, causing a denial of service.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2022-48929?

CVE-2022-48929 is a medium-severity memory corruption vulnerability in Linux kernel, published on 22 Aug 2024. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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.

Weakness: CWE-125

Which versions are affected by CVE-2022-48929?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2022-48929?

Apply the vendor's patch.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2022-48929 being exploited?

There is no known exploitation of CVE-2022-48929 in the wild and no public exploit code.

All Linux kernel vulnerabilities

Sources

Also known as DEBIAN-CVE-2022-48929, GHSA-5752-wxxv-m9xh, ROOT-OS-DEBIAN-11-CVE-2022-48929, ROOT-OS-UBUNTU-2204-CVE-2022-48929, ROOT-OS-UBUNTU-2404-CVE-2022-48929, UBUNTU-CVE-2022-48929.