{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-46106",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-46106"
  ],
  "published": "2026-05-28T09:36:53Z",
  "summary": "eventfs: Hold eventfs_mutex and SRCU when remount walks events",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\neventfs: Hold eventfs_mutex and SRCU when remount walks events\n\nCommit 340f0c7067a9 (\"eventfs: Update all the eventfs_inodes from the\nevents descriptor\") had eventfs_set_attrs() recurse through ei->children\non remount.  The walk only holds the rcu_read_lock() taken by\ntracefs_apply_options() over tracefs_inodes, which is wrong:\n\n  - list_for_each_entry over ei->children races with the list_del_rcu()\n    in eventfs_remove_rec() -- LIST_POISON1 deref, same shape as\n    d2603279c7d6.\n  - eventfs_inodes are freed via call_srcu(&eventfs_srcu, ...).\n    rcu_read_lock() does not extend an SRCU grace period, so ti->private\n    can be reclaimed under the walk.\n  - The writes to ei->attr race with eventfs_set_attr(), which holds\n    eventfs_mutex.\n\nReproducer:\n\n  while :; do mount -o remount,uid=$((RANDOM%1000)) /sys/kernel/tracing; done &\n  while :; do\n      echo \"p:kp submit_bio\" > /sys/kernel/tracing/kprobe_events\n      echo > /sys/kernel/tracing/kprobe_events\n  done\n\nWrap the events portion of tracefs_apply_options() in\neventfs_remount_lock()/_unlock() that take eventfs_mutex and\nsrcu_read_lock(&eventfs_srcu).  eventfs_set_attrs() doesn't sleep so the\nnested rcu_read_lock() is fine; lockdep_assert_held() pins the contract.\n\nComment in tracefs_drop_inode() said \"RCU cycle\" -- it is SRCU.",
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