CVE-2026-46106 (GCVE-0-2026-46106)
Vulnerability from cvelistv5 – Published: 2026-05-28 09:35 – Updated: 2026-06-14 17:54
VLAI
EPSS
VEX
Title
eventfs: Hold eventfs_mutex and SRCU when remount walks events
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.
Severity
5.5 (Medium)
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
7ec535ed8724d18ae4e714d2277a5b89450659d2 , < ae9cd0b46b1890040006a2fc5e905c5d6053fd02
(git)
Affected: 340f0c7067a95281ad13734f8225f49c6cf52067 , < 44e64d8a432837308f4dda3ffe819f1ec092a0ba (git) Affected: 340f0c7067a95281ad13734f8225f49c6cf52067 , < 52b109f1b875b912d4ab2c5fdd8c322d47119d9b (git) Affected: 340f0c7067a95281ad13734f8225f49c6cf52067 , < ed2ad73bcb0a7a6cc934097d4853b6d5124c317e (git) Affected: 340f0c7067a95281ad13734f8225f49c6cf52067 , < 07004a8c4b572171934390148ee48c4175c77eed (git) Affected: 99b86d85f7c73d676c50e8c35748f94dd41389da (git) Affected: 6.6.35 , < 6.6.140 (semver) Affected: 6.9.6 , < 6.10 (semver) |
guessed | |
| Linux | Linux |
Affected:
6.10
Unaffected: 0 , < 6.10 (semver) Unaffected: 6.6.140 , ≤ 6.6.* (semver) Unaffected: 6.12.88 , ≤ 6.12.* (semver) Unaffected: 6.18.30 , ≤ 6.18.* (semver) Unaffected: 7.0.7 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix) |
guessed |
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"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."
}
],
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{
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"title": "eventfs: Hold eventfs_mutex and SRCU when remount walks events",
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"cveId": "CVE-2026-46106",
"datePublished": "2026-05-28T09:35:11.034Z",
"dateReserved": "2026-05-13T15:03:33.097Z",
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"product_status:fixed": "1",
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"source": "Microsoft CSAF VEX",
"status": "final",
"title": "eventfs: Hold eventfs_mutex and SRCU when remount walks events",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-46106.json",
"version": "3"
},
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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; 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"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-27T16:20:42+00:00",
"cve": "CVE-2026-46106",
"id": "CVE-2026-46106",
"initial_release_date": "2026-05-28T00:00:00+00:00",
"product_status:known_affected": "76",
"product_status:known_not_affected": "198",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: eventfs: Hold eventfs_mutex and SRCU when remount walks events",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46106.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-07-07T02:20:24Z",
"cve": "CVE-2026-46106",
"id": "CVE-2026-46106",
"initial_release_date": "2026-05-29T01:17:08Z",
"product_status:known_affected": "30",
"product_status:known_not_affected": "179",
"product_status:recommended": "4",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-46106",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-46106.json",
"version": "6"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
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- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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