Divide By Zero Affecting kernel-rt-kvm package, versions *


Severity

Recommended
low

Based on CentOS security rating.

Threat Intelligence

EPSS
0.21% (12th percentile)

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  • Snyk IDSNYK-CENTOS10-KERNELRTKVM-18953712
  • published19 Aug 2026
  • disclosed15 Aug 2026

Introduced: 15 Aug 2026

NewCVE-2026-72010  (opens in a new tab)
CWE-369  (opens in a new tab)

How to fix?

There is no fixed version for Centos:10 kernel-rt-kvm.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt-kvm package and not the kernel-rt-kvm package as distributed by Centos. See How to fix? for Centos:10 relevant fixed versions and status.

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

cgroup/cpuset: rebind mm mempolicy to effective_mems, not mems_allowed

Creating a child cpuset where cpuset.mems is never set leads to a div/0 when a VMA mempolicy with MPOL_F_RELATIVE_NODES rebinds in response to a CPU hotplug event.

Reproduction steps:

  1. Create a cgroup w/ cpuset controls (do not set cpuset.mems)
  2. Move the task into the child cpuset
  3. Create a VMA mempolicy for that task with MPOL_F_RELATIVE_NODES
  4. unplug and hotplug a cpu echo 0 > /sys/devices/system/cpu/cpu1/online echo 1 > /sys/devices/system/cpu/cpu1/online
  5. mempolicy rebind does a div/0 in mpol_relative_nodemask on the call to __nodes_fold()

The cpuset code passes (cs->mems_allowed) which is not guaranteed to have nodes to the rebind routine. Use cs->effective_mems instead, which is guaranteed to have a non-empty nodemask once we reach that code path.

[ david: add a comment, slightly rephrase description ]

CVSS Base Scores

version 3.1