SB20260815248 - Improper resource shutdown or release in Linux kernel dma driver

Description

This security bulletin contains information about 1 vulnerability.

1) Improper resource shutdown or release (CVE-ID: CVE-2026-72474)

CWE-ID: CWE-404 - Improper Resource Shutdown or Release

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

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.

Remediation

Install update from vendor's website.

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