CVE-2026-64149
kernel: dma-mapping: move dma_map_resource() sanity check into debug code
Severity
LowRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · July 19, 2026
Updated · August 19, 2026
Description
A flaw was found in the Linux kernel's Direct Memory Access (DMA) mapping subsystem. On ARM64 systems configured with SPARSEMEM (a memory management model), the dma_map_resource() function could incorrectly identify valid memory-mapped input/output (MMIO) addresses as random access memory (RAM). This false identification would trigger a warning and cause the DMA mapping operation to fail, leading to system instability or a denial of service.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-253 · Incorrect Check of Function Return Value