Kernel crash via empty cpuset nodemask rebind
Published Aug 15, 2026 · Updated Aug 15, 2026
Divide-by-zero in the Linux kernel allows local users to crash the system through cpuset and memory-policy operations during CPU hotplug. The cpuset rebind path passes an empty cs->mems_allowed nodemask to mpol_relative_nodemask, whose __nodes_fold() call divides by zero instead of using the nonempty effective_mems mask. Triggering the fault requires control of a child cpuset, a VMA relative-nodes policy, and CPU offline and online operations, and the consequence is a local system crash.
Summary
What happened
Divide-by-zero in the Linux kernel allows local users to crash the system through cpuset and memory-policy operations during CPU hotplug. The cpuset rebind path passes an empty cs->mems_allowed nodemask to mpol_relative_nodemask, whose __nodes_fold() call divides by zero instead of using the nonempty effective_mems mask. Triggering the fault requires control of a child cpuset, a VMA relative-nodes policy, and CPU offline and online operations, and the consequence is a local system crash.
The record
- CVE
- CVE-2026-72010
- Published
- Aug 15, 2026
- Updated
- Aug 15, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1499
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 15, 2026CVE publishedPublication date reported by the CVE source.
- Aug 15, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=3.17
- Affected versionversion=ae1c802382f7af60aa54879fb4f5920a9df1ff48 <02f67c4f88be8e3dbd91951d13cdcc5bcc82e9c7
- Affected versionversion=ae1c802382f7af60aa54879fb4f5920a9df1ff48 <4b06449384b9ee5b3372bab60601ba5cd4162086
- Affected versionversion=ae1c802382f7af60aa54879fb4f5920a9df1ff48 <b7adeba2a21c98c7b20f18e27e3ead86bdb5e08d
- Affected versionversion=ae1c802382f7af60aa54879fb4f5920a9df1ff48 <b983c56426383e4a06fa5970c4e33cee879b1482
- Affected versionversion=ae1c802382f7af60aa54879fb4f5920a9df1ff48 <c17f06d8a085d6be58b544a440ce243f5e441a60
- Affected versionversion=ae1c802382f7af60aa54879fb4f5920a9df1ff48 <c844b7d9a9586de15dd28c06da5cc7f6ab28787d
- Affected versionversion=ae1c802382f7af60aa54879fb4f5920a9df1ff48 <fc680afc510157f6b137956011c09abc23eb0842
- Affected versionversion=ae1c802382f7af60aa54879fb4f5920a9df1ff48 <fcc8c310539c3cc523419113b227161a96b50550
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What is affected?
Published CVSS scores
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Attacks
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