{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-40178",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-40178"
  ],
  "published": "2025-11-12T22:01:07Z",
  "summary": "pid: Add a judgment for ns null in pid_nr_ns",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\npid: Add a judgment for ns null in pid_nr_ns\n\n__task_pid_nr_ns\n        ns = task_active_pid_ns(current);\n        pid_nr_ns(rcu_dereference(*task_pid_ptr(task, type)), ns);\n                if (pid && ns->level <= pid->level) {\n\nSometimes null is returned for task_active_pid_ns. Then it will trigger kernel panic in pid_nr_ns.\n\nFor example:\n\tUnable to handle kernel NULL pointer dereference at virtual address 0000000000000058\n\tMem abort info:\n\tESR = 0x0000000096000007\n\tEC = 0x25: DABT (current EL), IL = 32 bits\n\tSET = 0, FnV = 0\n\tEA = 0, S1PTW = 0\n\tFSC = 0x07: level 3 translation fault\n\tData abort info:\n\tISV = 0, ISS = 0x00000007, ISS2 = 0x00000000\n\tCM = 0, WnR = 0, TnD = 0, TagAccess = 0\n\tGCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0\n\tuser pgtable: 4k pages, 39-bit VAs, pgdp=00000002175aa000\n\t[0000000000000058] pgd=08000002175ab003, p4d=08000002175ab003, pud=08000002175ab003, pmd=08000002175be003, pte=0000000000000000\n\tpstate: 834000c5 (Nzcv daIF +PAN -UAO +TCO +DIT -SSBS BTYPE=--)\n\tpc : __task_pid_nr_ns+0x74/0xd0\n\tlr : __task_pid_nr_ns+0x24/0xd0\n\tsp : ffffffc08001bd10\n\tx29: ffffffc08001bd10 x28: ffffffd4422b2000 x27: 0000000000000001\n\tx26: ffffffd442821168 x25: ffffffd442821000 x24: 00000f89492eab31\n\tx23: 00000000000000c0 x22: ffffff806f5693c0 x21: ffffff806f5693c0\n\tx20: 0000000000000001 x19: 0000000000000000 x18: 0000000000000000\n\tx17: 00000000529c6ef0 x16: 00000000529c6ef0 x15: 00000000023a1adc\n\tx14: 0000000000000003 x13: 00000000007ef6d8 x12: 001167c391c78800\n\tx11: 00ffffffffffffff x10: 0000000000000000 x9 : 0000000000000001\n\tx8 : ffffff80816fa3c0 x7 : 0000000000000000 x6 : 49534d702d535449\n\tx5 : ffffffc080c4c2c0 x4 : ffffffd43ee128c8 x3 : ffffffd43ee124dc\n\tx2 : 0000000000000000 x1 : 0000000000000001 x0 : ffffff806f5693c0\n\tCall trace:\n\t__task_pid_nr_ns+0x74/0xd0\n\t...\n\t__handle_irq_event_percpu+0xd4/0x284\n\thandle_irq_event+0x48/0xb0\n\thandle_fasteoi_irq+0x160/0x2d8\n\tgeneric_handle_domain_irq+0x44/0x60\n\tgic_handle_irq+0x4c/0x114\n\tcall_on_irq_stack+0x3c/0x74\n\tdo_interrupt_handler+0x4c/0x84\n\tel1_interrupt+0x34/0x58\n\tel1h_64_irq_handler+0x18/0x24\n\tel1h_64_irq+0x68/0x6c\n\taccount_kernel_stack+0x60/0x144\n\texit_task_stack_account+0x1c/0x80\n\tdo_exit+0x7e4/0xaf8\n\t...\n\tget_signal+0x7bc/0x8d8\n\tdo_notify_resume+0x128/0x828\n\tel0_svc+0x6c/0x70\n\tel0t_64_sync_handler+0x68/0xbc\n\tel0t_64_sync+0x1a8/0x1ac\n\tCode: 35fffe54 911a02a8 f9400108 b4000128 (b9405a69)\n\t---[ end trace 0000000000000000 ]---\n\tKernel panic - not syncing: Oops: Fatal exception in interrupt",
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