{"cve":"CVE-2025-71142","nvd":{"published":"2026-01-14T15:16:04.010","modified":"2026-09-14T12:17:37.650","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":[],"references":["https://git.kernel.org/stable/c/5d8b9d38a7676be7bb5e7d57f92156a98dab39fb","https://git.kernel.org/stable/c/71953da7c979983917a4597bcad2c1ea6b8cc226","https://git.kernel.org/stable/c/aa7d3a56a20f07978d9f401e13637a6479b13bd0"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:19:41.481987139+00:00"},"epss":{"cve":"CVE-2025-71142","score":0.00135,"percentile":0.02935,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}