Improper Validation of Specified Quantity in Input in Linux kernel - CVE-2026-64149
Published: July 20, 2026
Vulnerability identifier: #VU138492
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-64149
CWE-ID: CWE-1284
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
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.
How to mitigate CVE-2026-64149
Install security update from vendor's repository.