CVE-2026-53187

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-53187

Key Details

CVE	CVE-2026-53187
CVSS Score / Version	7.1 (High) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H`
CVSS Prose	attack vector is local; attack complexity is low; privileges required is low; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is none; availability impact is high.
Affected products	Linux Kernel
Classified as	CWE-787 (Out-of-bounds Write)

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

In the Linux kernel, the following vulnerability has been resolved:

RDMA/core: Validate cpu_id against nr_cpu_ids in DMAH alloc

The cpu_id attribute supplied by user space through

UVERBS_ATTR_ALLOC_DMAH_CPU_ID is passed directly to cpumask_test_cpu()

without first verifying that the value is within the valid CPU range.

Passing such untrusted data to cpumask_test_cpu() may lead to an

out-of-bounds read of the underlying cpumask bitmap: the helper expands

to a test_bit() that indexes the bitmap by cpu_id / BITS_PER_LONG with

no bound check.

In addition, on kernels built with CONFIG_DEBUG_PER_CPU_MAPS it trips

the WARN_ON_ONCE() in cpumask_check(); combined with panic_on_warn this

turns a bad user input into a machine reboot.

Reject any cpu_id that is not smaller than nr_cpu_ids with -EINVAL

before it is used.

Reported by Smatch. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-53187
CVE	https://www.cve.org/CVERecord?id=CVE-2026-53187

Source

Reference

NVD

CVE