CVE-2025-40163
UnknownSummary
W jądrze systemu Linux zidentyfikowano podatność, która została naprawiona. Problem dotyczy sytuacji, w której timer dl_server nie jest zatrzymywany przed wyłączeniem CPU, co prowadzi do ostrzeżenia w jądrze podczas operacji usuwania CPU.
Risk Assessment
Podatność ta może prowadzić do nieprzewidzianych ostrzeżeń w jądrze, co może wpływać na stabilność systemu podczas operacji związanych z zarządzaniem CPU. W skrajnych przypadkach może to prowadzić do awarii systemu.
Recommendation
Zaleca się aktualizację jądra systemu Linux do wersji, w której ta podatność została naprawiona, aby uniknąć problemów związanych z zarządzaniem CPU.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: sched/deadline: Stop dl_server before CPU goes offline IBM CI tool reported kernel warning[1] when running a CPU removal operation through drmgr[2]. i.e "drmgr -c cpu -r -q 1" WARNING: CPU: 0 PID: 0 at kernel/sched/cpudeadline.c:219 cpudl_set+0x58/0x170 NIP [c0000000002b6ed8] cpudl_set+0x58/0x170 LR [c0000000002b7cb8] dl_server_timer+0x168/0x2a0 Call Trace: [c000000002c2f8c0] init_stack+0x78c0/0x8000 (unreliable) [c0000000002b7cb8] dl_server_timer+0x168/0x2a0 [c00000000034df84] __hrtimer_run_queues+0x1a4/0x390 [c00000000034f624] hrtimer_interrupt+0x124/0x300 [c00000000002a230] timer_interrupt+0x140/0x320 Git bisects to: commit 4ae8d9aa9f9d ("sched/deadline: Fix dl_server getting stuck") This happens since: - dl_server hrtimer gets enqueued close to cpu offline, when kthread_park enqueues a fair task. - CPU goes offline and drmgr removes it from cpu_present_mask. - hrtimer fires and warning is hit. Fix it by stopping the dl_server before CPU is marked dead. [1]: https://lore.kernel.org/all/[email protected]/ [2]: https://github.com/ibm-power-utilities/powerpc-utils/tree/next/src/drmgr [sshegde: wrote the changelog and tested it]
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

