{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-23025",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-23025"
  ],
  "published": "2026-01-31T11:52:25Z",
  "summary": "mm/page_alloc: prevent pcp corruption with SMP=n",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/page_alloc: prevent pcp corruption with SMP=n\n\nThe kernel test robot has reported:\n\n BUG: spinlock trylock failure on UP on CPU#0, kcompactd0/28\n  lock: 0xffff888807e35ef0, .magic: dead4ead, .owner: kcompactd0/28, .owner_cpu: 0\n CPU: 0 UID: 0 PID: 28 Comm: kcompactd0 Not tainted 6.18.0-rc5-00127-ga06157804399 #1 PREEMPT  8cc09ef94dcec767faa911515ce9e609c45db470\n Call Trace:\n  <IRQ>\n  __dump_stack (lib/dump_stack.c:95)\n  dump_stack_lvl (lib/dump_stack.c:123)\n  dump_stack (lib/dump_stack.c:130)\n  spin_dump (kernel/locking/spinlock_debug.c:71)\n  do_raw_spin_trylock (kernel/locking/spinlock_debug.c:?)\n  _raw_spin_trylock (include/linux/spinlock_api_smp.h:89 kernel/locking/spinlock.c:138)\n  __free_frozen_pages (mm/page_alloc.c:2973)\n  ___free_pages (mm/page_alloc.c:5295)\n  __free_pages (mm/page_alloc.c:5334)\n  tlb_remove_table_rcu (include/linux/mm.h:? include/linux/mm.h:3122 include/asm-generic/tlb.h:220 mm/mmu_gather.c:227 mm/mmu_gather.c:290)\n  ? __cfi_tlb_remove_table_rcu (mm/mmu_gather.c:289)\n  ? rcu_core (kernel/rcu/tree.c:?)\n  rcu_core (include/linux/rcupdate.h:341 kernel/rcu/tree.c:2607 kernel/rcu/tree.c:2861)\n  rcu_core_si (kernel/rcu/tree.c:2879)\n  handle_softirqs (arch/x86/include/asm/jump_label.h:36 include/trace/events/irq.h:142 kernel/softirq.c:623)\n  __irq_exit_rcu (arch/x86/include/asm/jump_label.h:36 kernel/softirq.c:725)\n  irq_exit_rcu (kernel/softirq.c:741)\n  sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1052)\n  </IRQ>\n  <TASK>\n RIP: 0010:_raw_spin_unlock_irqrestore (arch/x86/include/asm/preempt.h:95 include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194)\n  free_pcppages_bulk (mm/page_alloc.c:1494)\n  drain_pages_zone (include/linux/spinlock.h:391 mm/page_alloc.c:2632)\n  __drain_all_pages (mm/page_alloc.c:2731)\n  drain_all_pages (mm/page_alloc.c:2747)\n  kcompactd (mm/compaction.c:3115)\n  kthread (kernel/kthread.c:465)\n  ? __cfi_kcompactd (mm/compaction.c:3166)\n  ? __cfi_kthread (kernel/kthread.c:412)\n  ret_from_fork (arch/x86/kernel/process.c:164)\n  ? __cfi_kthread (kernel/kthread.c:412)\n  ret_from_fork_asm (arch/x86/entry/entry_64.S:255)\n  </TASK>\n\nMatthew has analyzed the report and identified that in drain_page_zone()\nwe are in a section protected by spin_lock(&pcp->lock) and then get an\ninterrupt that attempts spin_trylock() on the same lock.  The code is\ndesigned to work this way without disabling IRQs and occasionally fail the\ntrylock with a fallback.  However, the SMP=n spinlock implementation\nassumes spin_trylock() will always succeed, and thus it's normally a\nno-op.  Here the enabled lock debugging catches the problem, but otherwise\nit could cause a corruption of the pcp structure.\n\nThe problem has been introduced by commit 574907741599 (\"mm/page_alloc:\nleave IRQs enabled for per-cpu page allocations\").  The pcp locking scheme\nrecognizes the need for disabling IRQs to prevent nesting spin_trylock()\nsections on SMP=n, but the need to prevent the nesting in spin_lock() has\nnot been recognized.  Fix it by introducing local wrappers that change the\nspin_lock() to spin_lock_iqsave() with SMP=n and use them in all places\nthat do spin_lock(&pcp->lock).\n\n[vbabka@suse.cz: add pcp_ prefix to the spin_lock_irqsave wrappers, per Steven]",
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