CVE-2021-29648 Null dereference in n/a

What is CVE-2021-29648?

CVE-2021-29648 is a medium-severity vulnerability in Fedoraproject Fedora, published on 30 Mar 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

An issue was discovered in the Linux kernel before 5.11.11. The BPF subsystem does not properly consider that resolved_ids and resolved_sizes are intentionally uninitialized in the vmlinux BPF Type Format (BTF), which can cause a system crash upon an unexpected access attempt (in map_create in kernel/bpf/syscall.c or check_btf_info in kernel/bpf/verifier.c), aka CID-350a5c4dd245.

Weakness: CWE-307

Which versions are affected by CVE-2021-29648?

It affects 2 products.

Products include Fedoraproject Fedora, Linux kernel.

How do I fix CVE-2021-29648?

Apply the vendor's patch.

Is CVE-2021-29648 being exploited?

There is no known exploitation of CVE-2021-29648 in the wild and no public exploit code.

Other vulnerabilities in Fedoraproject Fedora

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• CVE-2021-39226 Grafana Authentication Bypass Exploited Critical 9.8
• CVE-2019-5544 VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow Exploited Critical 9.8
• CVE-2024-4947 Google Chromium V8 Type Confusion Exploited Critical 9.6
• CVE-2024-4671 Google Chromium Visuals Use-After-Free Exploited Critical 9.6

All Fedoraproject Fedora vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-6551, GHSA-5j67-5c69-hf75, UBUNTU-CVE-2021-29648.