{
  "cveId": "CVE-2025-39886",
  "url": "https://patchblox.com/security/cve/CVE-2025-39886",
  "summary": "CVE-2025-39886 is fixed in 58 products on 1 platform, first by DEBIAN-CVE-2025-39886, released September 23, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "bpf: Tell memcg to use allow_spinning=false path in bpf_timer_init()",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  bpf: Tell memcg to use allow_spinning=false path in bpf_timer_init()  Currently, calling bpf_map_kmalloc_node() from __bpf_async_init() can cause various locking issues; see the following stack trace (edited for style) as one example:  ...  [10.011566]  do_raw_spin_lock.cold  [10.011570]  try_to_wake_up             (5) double-acquiring the same  [10.011575]  kick_pool                      rq_lock, causing a hardlockup  [10.011579]  __queue_work  [10.011582]  queue_work_on  [10.011585]  kernfs_notify  [10.011589]  cgroup_file_notify  [10.011593]  try_charge_memcg           (4) memcg accounting raises an  [10.011597]  obj_cgroup_charge_pages        MEMCG_MAX event  [10.011599]  obj_cgroup_charge_account  [10.011600]  __memcg_slab_post_alloc_hook  [10.011603]  __kmalloc_node_noprof ...  [10.011611]  bpf_map_kmalloc_node  [10.011612]  __bpf_async_init  [10.011615]  bpf_timer_init             (3) BPF calls bpf_timer_init()  [10.011617]  bpf_prog_xxxxxxxxxxxxxxxx_fcg_runnable  [10.011619]  bpf__sched_ext_ops_runnable  [10.011620]  enqueue_task_scx           (2) BPF runs with rq_lock held  [10.011622]  enqueue_task  [10.011626]  ttwu_do_activate  [10.011629]  sched_ttwu_pending         (1) grabs rq_lock ...  The above was reproduced on bpf-next (b338cf849ec8) by modifying ./tools/sched_ext/scx_flatcg.bpf.c to call bpf_timer_init() during ops.runnable(), and hacking the memcg accounting code a bit to make a bpf_timer_init() call more likely to raise an MEMCG_MAX event.  We have also run into other similar variants (both internally and on bpf-next), including double-acquiring cgroup_file_kn_lock, the same worker_pool::lock, etc.  As suggested by Shakeel, fix this by using __GFP_HIGH instead of GFP_ATOMIC in __bpf_async_init(), so that e.g. if try_charge_memcg() raises an MEMCG_MAX event, we call __memcg_memory_event() with @allow_spinning=false and avoid calling cgroup_file_notify() there.  Depends on mm patch \u0022memcg: skip cgroup_file_notify if spinning is not allowed\u0022: https://lore.kernel.org/bpf/20250905201606.66198-1-shakeel.butt@linux.dev/  v0 approach s/bpf_map_kmalloc_node/bpf_mem_alloc/ https://lore.kernel.org/bpf/20250905061919.439648-1-yepeilin@google.com/ v1 approach: https://lore.kernel.org/bpf/20250905234547.862249-1-yepeilin@google.com/",
  "published": "2025-09-23T06:15:48Z",
  "severity": "Moderate",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00151,
  "epssPercentile": 0.04299,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-39886",
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