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CVE Record

CVE-2025-71142: cpuset: fix warning when disabling remote partition

In the Linux kernel, the following vulnerability has been resolved: cpuset: fix warning when disabling remote partition A warning was triggered as follows: WARNING: kernel/cgroup/cpuset.c:1651 at remote_partition_disable+0xf7/0x110 RIP: 0010:remote_partition_disable+0xf7/0x110 RSP: 0018:ffffc90001947d88 EFLAGS: 00000206 RAX: 0000000000007fff RBX: ffff888103b6e000 RCX: 0000000000006f40 RDX: 0000000000006f00 RSI: ffffc90001947da8 RDI: ffff888103b6e000 RBP: ffff888103b6e000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: ffff88810b2e2728 R12: ffffc90001947da8 R13: 0000000000000000 R14: ffffc90001947da8 R15: ffff8881081f1c00 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f55c8bbe0b2 CR3: 000000010b14c000 CR4: 00000000000006f0 Call Trace: <TASK> update_prstate+0x2d3/0x580 cpuset_partition_write+0x94/0xf0 kernfs_fop_write_iter+0x147/0x200 vfs_write+0x35d/0x500 ksys_write+0x66/0xe0 do_syscall_64+0x6b/0x390 entry_SYSCALL_64_after_hwframe+0x4b/0x53 RIP: 0033:0x7f55c8cd4887 Reproduction steps (on a 16-CPU machine): # cd /sys/fs/cgroup/ # mkdir A1 # echo +cpuset > A1/cgroup.subtree_control # echo "0-14" > A1/cpuset.cpus.exclusive # mkdir A1/A2 # echo "0-14" > A1/A2/cpuset.cpus.exclusive # echo "root" > A1/A2/cpuset.cpus.partition # echo 0 > /sys/devices/system/cpu/cpu15/online # echo member > A1/A2/cpuset.cpus.partition When CPU 15 is offlined, subpartitions_cpus gets cleared because no CPUs remain available for the top_cpuset, forcing partitions to share CPUs with the top_cpuset. In this scenario, disabling the remote partition triggers a warning stating that effective_xcpus is not a subset of subpartitions_cpus. Partitions should be invalidated in this case to inform users that the partition is now invalid(cpus are shared with top_cpuset). To fix this issue: 1. Only emit the warning only if subpartitions_cpus is not empty and the effective_xcpus is not a subset of subpartitions_cpus. 2. During the CPU hotplug process, invalidate partitions if subpartitions_cpus is empty.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel cpuset bug that can leave CPU partition state invalid during CPU hotplug activity and trigger a kernel warning. The source does not describe data theft, privilege escalation, or remote attack. Business urgency depends on whether affected kernels use cpuset partitions and CPU offline operations.

Executive priority

Treat as a targeted Linux kernel reliability issue with incomplete impact data. It should enter normal vulnerability management, with higher priority for infrastructure relying on cpuset partitioning, CPU isolation, or dynamic CPU hotplug behavior.

Technical view

The issue is in kernel cgroup cpuset partition handling. When a CPU is offlined and no CPUs remain available for the top cpuset, subpartition tracking can be cleared. Disabling a remote partition can then warn on an invalid subset condition instead of invalidating affected partitions.

Likely exposure

Exposure appears limited to Linux systems running affected kernel builds listed in the CVE data, especially environments using cgroup cpuset partitioning with CPU hotplug or CPU offline workflows. The bundle does not identify affected distributions or appliances.

Exploitation context

No active exploitation is cited, and the CVE is not marked KEV in the provided bundle. The public description includes local reproduction conditions, but no exploit impact or weaponized abuse is documented here.

Researcher notes

The fix changes warning conditions and invalidates partitions when subpartitions_cpus is empty during CPU hotplug. Evidence supports a kernel correctness and state-validity bug; security impact remains unstated in the provided sources.

Mitigation direction

  • Check vendor or distribution kernel advisories for backported fixes.
  • Prioritize kernels matching the CVE affected records and stable references.
  • Avoid unnecessary CPU offline operations on cpuset-partitioned systems until patched.
  • Plan kernel updates through normal maintenance windows unless vendor severity changes.

Validation and detection

  • Inventory running Linux kernel versions against the CVE record.
  • Identify hosts using cgroup cpuset partition features.
  • Review kernel logs for cpuset warnings during CPU hotplug events.
  • Confirm whether referenced stable commits are included downstream.
  • Track vendor advisories for clarified impact and fixed package versions.
Prepared
Confidence
medium
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
0ADP providers
3Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

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  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

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Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxf62a5d39368e34a966c8df63e1f05eed7fe9c5de, f62a5d39368e34a966c8df63e1f05eed7fe9c5deunaffected
LinuxLinux6.15, 0, 6.18.4, 6.19affected
Weakness

CWE details

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