{"id":"CVE-2025-71142","title":"cpuset: fix warning when disabling remote partition","summary":"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\nRI…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 93f045741dac64facf90c2216f9a1d0876d122c4 < 71953da7c979983917a4597bcad2c1ea6b8cc226","Linux >= f62a5d39368e34a966c8df63e1f05eed7fe9c5de < 5d8b9d38a7676be7bb5e7d57f92156a98dab39fb","Linux >= f62a5d39368e34a966c8df63e1f05eed7fe9c5de < aa7d3a56a20f07978d9f401e13637a6479b13bd0","Linux 6.15"],"published":"2026-01-14","updated":"2026-09-14","sourceUpdated":"2026-09-14T11:58:09.697Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-71142","references":[{"url":"https://git.kernel.org/stable/c/71953da7c979983917a4597bcad2c1ea6b8cc226"},{"url":"https://git.kernel.org/stable/c/5d8b9d38a7676be7bb5e7d57f92156a98dab39fb"},{"url":"https://git.kernel.org/stable/c/aa7d3a56a20f07978d9f401e13637a6479b13bd0"}],"tags":["cve.org"],"epss":0.00132,"epssPercentile":0.03118,"ingestedAt":"2026-09-14T15:23:07.459Z","slug":"CVE-2025-71142","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= 93f045741dac64facf90c2216f9a1d0876d122c4 < 71953da7c979983917a4597bcad2c1ea6b8cc226`\n- `Linux >= f62a5d39368e34a966c8df63e1f05eed7fe9c5de < 5d8b9d38a7676be7bb5e7d57f92156a98dab39fb`\n- `Linux >= f62a5d39368e34a966c8df63e1f05eed7fe9c5de < aa7d3a56a20f07978d9f401e13637a6479b13bd0`\n- `Linux 6.15`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}