CVE-2024-47743 KEYS: prevent NULL pointer dereference in find_asymmetric_key()

What is CVE-2024-47743?

CVE-2024-47743 is a medium-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:

KEYS: prevent NULL pointer dereference in find_asymmetric_key()

In find_asymmetric_key(), if all NULLs are passed in the id_{0,1,2} arguments, the kernel will first emit WARN but then have an oops because id_2 gets dereferenced anyway.

Add the missing id_2 check and move WARN_ON() to the final else branch to avoid duplicate NULL checks.

Found by Linux Verification Center (linuxtesting.org) with Svace static analysis tool.

Weakness: CWE-476

Which versions are affected by CVE-2024-47743?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2024-47743?

Apply the vendor's patch.

Is CVE-2024-47743 being exploited?

There is no known exploitation of CVE-2024-47743 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-50643, BELL-CVE-2024-47743, DEBIAN-CVE-2024-47743, GHSA-2xch-4r76-8cgw, UBUNTU-CVE-2024-47743.