SB2026072080 - Improper Validation of Specified Quantity in Input in Linux kernel dma

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Validation of Specified Quantity in Input (CVE-ID: CVE-2026-64149)

CWE-ID: CWE-1284 - Improper Validation of Specified Quantity in Input

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 user to cause a denial of service.

The vulnerability exists due to improper resource validation in dma_map_resource() and dma-debug handling when mapping MMIO resources that share a sparse memory section with RAM. A local user can trigger the vulnerable code path to cause a denial of service.

This can occur on ARM64 systems with SPARSEMEM where MMIO addresses have struct pages in the same section as RAM, leading to a warning and DMA_MAPPING_ERROR during device probe.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/004a777879ff629f6e0ca3d09ad09fa3452bcc4d
• https://git.kernel.org/stable/c/181e67bc11c5ec5b87c6c512c2078752b23ca8d4
• https://git.kernel.org/stable/c/af0c3f05866237f7592219bfe05387bc3bfc99b5