CVE-2024-47703 bpf, lsm: Add check for BPF LSM return value

What is CVE-2024-47703?

CVE-2024-47703 is a high-severity denial of service 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:

bpf, lsm: Add check for BPF LSM return value

A bpf prog returning a positive number attached to file_alloc_security hook makes kernel panic.

This happens because file system can not filter out the positive number returned by the LSM prog using IS_ERR, and misinterprets this positive number as a file pointer.

Given that hook file_alloc_security never returned positive number before the introduction of BPF LSM, and other BPF LSM hooks may encounter similar issues, this patch adds LSM return value check in verifier, to ensure no unexpected value is returned.

Which versions are affected by CVE-2024-47703?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2024-47703?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2024-47703 being exploited?

There is no known exploitation of CVE-2024-47703 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 AZL-51182, AZL-51275, BELL-CVE-2024-47703, DEBIAN-CVE-2024-47703, GHSA-h5ph-x8j2-r7vg, ROOT-OS-DEBIAN-11-CVE-2024-47703 and 3 more.