Improper resource shutdown or release in Linux kernel - CVE-2026-72474

Vulnerability details

The vulnerability allows a local attacker to cause a denial of service.

The vulnerability exists due to improper resource management in the dma-axi-dmac driver descriptor handling when freeing DMA descriptors from softirq context. A local attacker can trigger DMA operations that cause descriptor cleanup to invoke dma_free_coherent() in interrupt context to cause a denial of service.

The issue is observable on architectures such as Microblaze or arm64 where DMA_DIRECT_REMAP is set.

Affected software

How to mitigate CVE-2026-72474

External References

• https://git.kernel.org/stable/c/65e82fa24965b2eb6ad9412f6c530ed9a50a625f
• https://git.kernel.org/stable/c/9e942c8579130e62734c14338e9f451780669164
• https://git.kernel.org/stable/c/a4f41ceecfe68e117bae9c76c5ebc5e2b353fa56
• https://git.kernel.org/stable/c/c0e6bb2b0408fcac6382158ee2bd9fdc45eceee9

Related Security Bulletins

• Improper resource shutdown or release in Linux kernel dma driver