CVE-2026-46106 (GCVE-0-2026-46106)
Vulnerability from cvelistv5
Published
2026-05-28 09:35
Modified
2026-06-14 17:54
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: eventfs: Hold eventfs_mutex and SRCU when remount walks events Commit 340f0c7067a9 ("eventfs: Update all the eventfs_inodes from the events descriptor") had eventfs_set_attrs() recurse through ei->children on remount. The walk only holds the rcu_read_lock() taken by tracefs_apply_options() over tracefs_inodes, which is wrong: - list_for_each_entry over ei->children races with the list_del_rcu() in eventfs_remove_rec() -- LIST_POISON1 deref, same shape as d2603279c7d6. - eventfs_inodes are freed via call_srcu(&eventfs_srcu, ...). rcu_read_lock() does not extend an SRCU grace period, so ti->private can be reclaimed under the walk. - The writes to ei->attr race with eventfs_set_attr(), which holds eventfs_mutex. Reproducer: while :; do mount -o remount,uid=$((RANDOM%1000)) /sys/kernel/tracing; done & while :; do echo "p:kp submit_bio" > /sys/kernel/tracing/kprobe_events echo > /sys/kernel/tracing/kprobe_events done Wrap the events portion of tracefs_apply_options() in eventfs_remount_lock()/_unlock() that take eventfs_mutex and srcu_read_lock(&eventfs_srcu). eventfs_set_attrs() doesn't sleep so the nested rcu_read_lock() is fine; lockdep_assert_held() pins the contract. Comment in tracefs_drop_inode() said "RCU cycle" -- it is SRCU.
References
Impacted products
Vendor Product Version
Linux Linux Version: 7ec535ed8724d18ae4e714d2277a5b89450659d2
Version: 340f0c7067a95281ad13734f8225f49c6cf52067
Version: 340f0c7067a95281ad13734f8225f49c6cf52067
Version: 340f0c7067a95281ad13734f8225f49c6cf52067
Version: 340f0c7067a95281ad13734f8225f49c6cf52067
Version: 99b86d85f7c73d676c50e8c35748f94dd41389da
Version: 6.6.35   ≤
Version: 6.9.6   ≤
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/tracefs/event_inode.c",
            "fs/tracefs/inode.c",
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              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
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      ],
      "cpeApplicability": [
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          "nodes": [
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "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-\u003echildren\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-\u003echildren 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(\u0026eventfs_srcu, ...).\n    rcu_read_lock() does not extend an SRCU grace period, so ti-\u003eprivate\n    can be reclaimed under the walk.\n  - The writes to ei-\u003eattr 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 \u0026\n  while :; do\n      echo \"p:kp submit_bio\" \u003e /sys/kernel/tracing/kprobe_events\n      echo \u003e /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(\u0026eventfs_srcu).  eventfs_set_attrs() doesn\u0027t 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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-14T17:54:53.367Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ae9cd0b46b1890040006a2fc5e905c5d6053fd02"
        },
        {
          "url": "https://git.kernel.org/stable/c/44e64d8a432837308f4dda3ffe819f1ec092a0ba"
        },
        {
          "url": "https://git.kernel.org/stable/c/52b109f1b875b912d4ab2c5fdd8c322d47119d9b"
        },
        {
          "url": "https://git.kernel.org/stable/c/ed2ad73bcb0a7a6cc934097d4853b6d5124c317e"
        },
        {
          "url": "https://git.kernel.org/stable/c/07004a8c4b572171934390148ee48c4175c77eed"
        }
      ],
      "title": "eventfs: Hold eventfs_mutex and SRCU when remount walks events",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46106",
    "datePublished": "2026-05-28T09:35:11.034Z",
    "dateReserved": "2026-05-13T15:03:33.097Z",
    "dateUpdated": "2026-06-14T17:54:53.367Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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