CVE-2026-68153 (GCVE-0-2026-68153)
Vulnerability from cvelistv5 – Published: 2026-08-10 11:59 – Updated: 2026-08-19 16:30
VLAI
EPSS
VEX
Title
libceph: remove debugfs files before client teardown
Summary
In the Linux kernel, the following vulnerability has been resolved:
libceph: remove debugfs files before client teardown
ceph_destroy_client() tears down the monitor client before removing
the per-client debugfs files. A concurrent read of the monmap debugfs
file can enter monmap_show() after ceph_monc_stop() has freed
monc->monmap, triggering a use-after-free.
Remove the debugfs files before stopping the OSD and monitor clients.
debugfs_remove() drains active handlers and prevents new accesses, so
the debugfs callbacks can no longer race the rest of client teardown.
Severity
7.8 (High)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
76aa844d5b2fb8c839180d3f5874e333b297e5fd , < ac78549d186090ee7125d28c3a8c376573b36194
(git)
Affected: 76aa844d5b2fb8c839180d3f5874e333b297e5fd , < 463a264e9094384112a5c8b46f0a9ddaf8566904 (git) Affected: 76aa844d5b2fb8c839180d3f5874e333b297e5fd , < fe46b7e06f14f6f94766832df309b249cb689d27 (git) Affected: 76aa844d5b2fb8c839180d3f5874e333b297e5fd , < fc1010e7e0204ece6cc0f9af4f473e9553535eab (git) Affected: 76aa844d5b2fb8c839180d3f5874e333b297e5fd , < d3dc8889d39a676bf840132bd5c5c48cb0daba23 (git) Affected: 76aa844d5b2fb8c839180d3f5874e333b297e5fd , < 8f5a3abc54ba24dbceb14cc3a719908c4f688091 (git) Affected: 76aa844d5b2fb8c839180d3f5874e333b297e5fd , < b9fedda2f628e030384228de0dafc574b7fb0c2f (git) Affected: 76aa844d5b2fb8c839180d3f5874e333b297e5fd , < e4c804726c4afce3ba648b982d564f6af2cfa328 (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.34
Unaffected: 0 , < 2.6.34 (semver) Unaffected: 5.10.265 , ≤ 5.10.* (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.148 , ≤ 6.6.* (semver) Unaffected: 6.12.101 , ≤ 6.12.* (semver) Unaffected: 6.18.42 , ≤ 6.18.* (semver) Unaffected: 7.1.6 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
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{
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: remove debugfs files before client teardown\n\nceph_destroy_client() tears down the monitor client before removing\nthe per-client debugfs files. A concurrent read of the monmap debugfs\nfile can enter monmap_show() after ceph_monc_stop() has freed\nmonc-\u003emonmap, triggering a use-after-free.\n\nRemove the debugfs files before stopping the OSD and monitor clients.\ndebugfs_remove() drains active handlers and prevents new accesses, so\nthe debugfs callbacks can no longer race the rest of client teardown."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - Exploitation requires local access to debugfs via read() on /sys/kernel/debug/ceph/client*/monmap concurrent with local ceph client teardown via umount or rbd unmap; the bug is not reachable through Ceph network protocol handlers.\nAC:L - The attacker controls both sides of the race by concurrently reading the monmap debugfs file while triggering ceph_destroy_client() via umount/rbd teardown, and can retry until the window between ceph_monc_stop() and debugfs removal is hit.\nPR:L - An unprivileged local user can use user-namespace capabilities (CAP_DAC_READ_SEARCH) to read root-owned debugfs files and race reads against libceph client teardown during automated volume detach or service restarts on Ceph storage nodes.\nUI:N - No victim user interaction is required; a local attacker can independently issue debugfs reads and trigger or time against client teardown without requiring another user to click, open files, or mount filesystems.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security domain and does not cross VM, container, or IOMMU boundaries; impact is standard kernel privilege escalation or crash.\nC:H - The use-after-free on monc-\u003emonmap permits reading freed heap memory containing monitor addresses and entity metadata, and UAF primitives are routinely leveraged for arbitrary kernel memory disclosure.\nI:H - Heap use-after-free on the variable-length ceph_monmap structure enables memory corruption that can be groomed into arbitrary kernel write primitives and local privilege escalation via control-flow hijacking.\nA:H - Concurrent access to freed monmap memory during debugfs iteration can cause kernel oops, BUG, or panic, and UAF corruption reliably threatens system availability even when full exploitation is not attempted."
}
]
}
],
"providerMetadata": {
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},
{
"url": "https://git.kernel.org/stable/c/e4c804726c4afce3ba648b982d564f6af2cfa328"
}
],
"title": "libceph: remove debugfs files before client teardown",
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"cveId": "CVE-2026-68153",
"datePublished": "2026-08-10T11:59:19.302Z",
"dateReserved": "2026-07-30T09:28:09.371Z",
"dateUpdated": "2026-08-19T16:30:18.048Z",
"state": "PUBLISHED"
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"descriptions": [
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"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibceph: remove debugfs files before client teardown\n\nceph_destroy_client() tears down the monitor client before removing\nthe per-client debugfs files. A concurrent read of the monmap debugfs\nfile can enter monmap_show() after ceph_monc_stop() has freed\nmonc-\u003emonmap, triggering a use-after-free.\n\nRemove the debugfs files before stopping the OSD and monitor clients.\ndebugfs_remove() drains active handlers and prevents new accesses, so\nthe debugfs callbacks can no longer race the rest of client teardown."
}
],
"id": "CVE-2026-68153",
"lastModified": "2026-08-19T17:20:32.377",
"metrics": {
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"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
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"published": "2026-08-10T13:20:01.417",
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}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-08-13T23:17:25+00:00",
"cve": "CVE-2026-68153",
"id": "CVE-2026-68153",
"initial_release_date": "2026-08-10T00:00:00+00:00",
"product_status:known_affected": "260",
"product_status:known_not_affected": "14",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: libceph: remove debugfs files before client teardown",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68153.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-23T00:21:07Z",
"cve": "CVE-2026-68153",
"id": "CVE-2026-68153",
"initial_release_date": "2026-08-17T16:29:42Z",
"product_status:first_fixed": "68",
"product_status:known_affected": "677",
"product_status:recommended": "130",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-68153",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68153.json",
"version": "11"
}
}
}
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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.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- 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.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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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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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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