CVE-2025-71142

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