CVE-2024-43856 dma: fix call order in dmam_free_coherent

What is CVE-2024-43856?

CVE-2024-43856 is a high-severity vulnerability in Linux kernel, published on 17 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:

dma: fix call order in dmam_free_coherent

dmam_free_coherent() frees a DMA allocation, which makes the freed vaddr available for reuse, then calls devres_destroy() to remove and free the data structure used to track the DMA allocation. Between the two calls, it is possible for a concurrent task to make an allocation with the same vaddr and add it to the devres list.

If this happens, there will be two entries in the devres list with the same vaddr and devres_destroy() can free the wrong entry, triggering the WARN_ON() in dmam_match.

Fix by destroying the devres entry before freeing the DMA allocation.

kokonut //net/encryption http://sponge2/b9145fe6-0f72-4325-ac2f-a84d81075b03

Weakness: CWE-770

Which versions are affected by CVE-2024-43856?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2024-43856?

Apply the vendor's patch.

Is CVE-2024-43856 being exploited?

There is no known exploitation of CVE-2024-43856 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-47937, AZL-48027, BELL-CVE-2024-43856, DEBIAN-CVE-2024-43856, GHSA-g877-jjjq-5fjc, UBUNTU-CVE-2024-43856.