CVE-2021-33200 Memory corruption in n/a

What is CVE-2021-33200?

CVE-2021-33200 is a high-severity memory corruption vulnerability in Fedoraproject Fedora, published on 27 May 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

kernel/bpf/verifier.c in the Linux kernel through 5.12.7 enforces incorrect limits for pointer arithmetic operations, aka CID-bb01a1bba579. This can be abused to perform out-of-bounds reads and writes in kernel memory, leading to local privilege escalation to root. In particular, there is a corner case where the off reg causes a masking direction change, which then results in an incorrect final aux->alu_limit.

Weakness: CWE-787

Which versions are affected by CVE-2021-33200?

It affects 12 products.

Products include Fedoraproject Fedora, Linux kernel, Netapp Cloud Backup, Netapp H300e Firmware, Netapp H300s Firmware, Netapp H410s Firmware and 6 more.

How do I fix CVE-2021-33200?

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-2021-33200 being exploited?

There is no known exploitation of CVE-2021-33200 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 A-190011721, AZL-6563, DEBIAN-CVE-2021-33200, GHSA-594v-c36q-5p83, MGASA-2021-0225, PUB-A-190011721 and 1 more.