CVE-2024-43890 tracing: Fix overflow in get_free_elt()

What is CVE-2024-43890?

CVE-2024-43890 is a medium-severity vulnerability in Linux kernel, published on 26 Aug 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:

tracing: Fix overflow in get_free_elt()

"tracing_map->next_elt" in get_free_elt() is at risk of overflowing.

Once it overflows, new elements can still be inserted into the tracing_map even though the maximum number of elements (`max_elts`) has been reached. Continuing to insert elements after the overflow could result in the tracing_map containing "tracing_map->max_size" elements, leaving no empty entries. If any attempt is made to insert an element into a full tracing_map using `__tracing_map_insert()`, it will cause an infinite loop with preemption disabled, leading to a CPU hang problem.

Fix this by preventing any further increments to "tracing_map->next_elt" once it reaches "tracing_map->max_elt".

Weakness: CWE-190

Which versions are affected by CVE-2024-43890?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2024-43890?

Apply the vendor's patch.

Is CVE-2024-43890 being exploited?

There is no known exploitation of CVE-2024-43890 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-48620, BELL-CVE-2024-43890, DEBIAN-CVE-2024-43890, GHSA-mxxf-4gg8-94vw, UBUNTU-CVE-2024-43890.