Out-of-bounds read in Linux kernel - CVE-2026-53187
Published: June 26, 2026
Vulnerability identifier: #VU135592
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-2026-53187
CWE-ID: CWE-125
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 an out-of-bounds read in UVERBS_METHOD_DMAH_ALLOC in drivers/infiniband/core/uverbs_std_types_dmah.c when processing a user-supplied UVERBS_ATTR_ALLOC_DMAH_CPU_ID value. A local user can supply a cpu_id outside the valid CPU range to cause a denial of service.
On systems built with CONFIG_DEBUG_PER_CPU_MAPS and panic_on_warn enabled, the issue can result in a machine reboot.
How to mitigate CVE-2026-53187
Install security update from vendor's repository.