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CVE-2022-48929

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix crash due to out of bounds access into reg2btf_ids.

Published Aug 22, 2024CWE-125EPSS 0.21%

Overview

CVE-2022-48929 is a medium-severity vulnerability. It was published on August 22, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/45ce4b4f9009102cd9f581196d480a59208690c1Refgit.kernel.org/stable/c/8c39925e98d498b9531343066ef82ae39e41adaeRefgit.kernel.org/stable/c/f0ce1bc9e0235dd7412240be493d7ea65ed9eadc

How CyberStrike helps

Frequently asked questions

What is CVE-2022-48929?

CVE-2022-48929 is a medium-severity vulnerability. It was published on August 22, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2022-48929?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2022-48929?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2022-48929?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2022-48929 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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