CVE-2022-49030 libbpf: Handle size overflow for ringbuf mmap

What is CVE-2022-49030?

CVE-2022-49030 is a high-severity vulnerability in Linux kernel, published on 21 Oct 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:

libbpf: Handle size overflow for ringbuf mmap

The maximum size of ringbuf is 2GB on x86-64 host, so 2 * max_entries will overflow u32 when mapping producer page and data pages. Only casting max_entries to size_t is not enough, because for 32-bits application on 64-bits kernel the size of read-only mmap region also could overflow size_t.

So fixing it by casting the size of read-only mmap region into a __u64 and checking whether or not there will be overflow during mmap.

Weakness: CWE-190

Which versions are affected by CVE-2022-49030?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2022-49030?

Apply the vendor's patch.

Is CVE-2022-49030 being exploited?

There is no known exploitation of CVE-2022-49030 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

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

Also known as DEBIAN-CVE-2022-49030, GHSA-75vm-7626-f557, UBUNTU-CVE-2022-49030.