CVE-2025-68788 (GCVE-0-2025-68788)
Vulnerability from cvelistv5 – Published: 2026-01-13 15:29 – Updated: 2026-09-08 08:43
VLAI
EPSS
VEX
Title
fsnotify: do not generate ACCESS/MODIFY events on child for special files
Summary
In the Linux kernel, the following vulnerability has been resolved:
fsnotify: do not generate ACCESS/MODIFY events on child for special files
inotify/fanotify do not allow users with no read access to a file to
subscribe to events (e.g. IN_ACCESS/IN_MODIFY), but they do allow the
same user to subscribe for watching events on children when the user
has access to the parent directory (e.g. /dev).
Users with no read access to a file but with read access to its parent
directory can still stat the file and see if it was accessed/modified
via atime/mtime change.
The same is not true for special files (e.g. /dev/null). Users will not
generally observe atime/mtime changes when other users read/write to
special files, only when someone sets atime/mtime via utimensat().
Align fsnotify events with this stat behavior and do not generate
ACCESS/MODIFY events to parent watchers on read/write of special files.
The events are still generated to parent watchers on utimensat(). This
closes some side-channels that could be possibly used for information
exfiltration [1].
[1] https://snee.la/pdf/pubs/file-notification-attacks.pdf
Severity
No CVSS data available.
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-16 16:22 UTC
Assigner
References
8 references
Impacted products
5 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
72acc854427948efed7a83da27f7dc3239ac9afc , < df2711544b050aba703e6da418c53c7dc5d443ca
(git)
Affected: 72acc854427948efed7a83da27f7dc3239ac9afc , < 859bdf438f01d9aa7f84b09c1202d548c7cad9e8 (git) Affected: 72acc854427948efed7a83da27f7dc3239ac9afc , < 6a7d7d96eeeab7af2bd01afbb3d9878a11a13d91 (git) Affected: 72acc854427948efed7a83da27f7dc3239ac9afc , < e0643d46759db8b84c0504a676043e5e341b6c81 (git) Affected: 72acc854427948efed7a83da27f7dc3239ac9afc , < 82f7416bcbd951549e758d15fc1a96a5afc2e900 (git) Affected: 72acc854427948efed7a83da27f7dc3239ac9afc , < 7a93edb23bcf07a3aaf8b598edfc2faa8fbcc0b6 (git) Affected: 72acc854427948efed7a83da27f7dc3239ac9afc , < 635bc4def026a24e071436f4f356ea08c0eed6ff (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.36
Unaffected: 0 , < 2.6.36 (semver) Unaffected: 5.10.248 , ≤ 5.10.* (semver) Unaffected: 5.15.198 , ≤ 5.15.* (semver) Unaffected: 6.1.160 , ≤ 6.1.* (semver) Unaffected: 6.6.120 , ≤ 6.6.* (semver) Unaffected: 6.12.64 , ≤ 6.12.* (semver) Unaffected: 6.18.3 , ≤ 6.18.* (semver) Unaffected: 6.19 , ≤ * (original_commit_for_fix) |
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.6 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.6 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.6 , < *
(custom)
|
guessed |
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"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-06-28T11:01:11+00:00",
"cve": "CVE-2025-68788",
"id": "CVE-2025-68788",
"initial_release_date": "2025-01-01T00:00:00+00:00",
"product_status:known_affected": "274",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: fsnotify: do not generate ACCESS/MODIFY events on child for special files",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68788.json",
"version": "3"
},
"vulnrichment": {
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\"https://git.kernel.org/stable/c/859bdf438f01d9aa7f84b09c1202d548c7cad9e8\"}, {\"url\": \"https://git.kernel.org/stable/c/6a7d7d96eeeab7af2bd01afbb3d9878a11a13d91\"}, {\"url\": \"https://git.kernel.org/stable/c/e0643d46759db8b84c0504a676043e5e341b6c81\"}, {\"url\": \"https://git.kernel.org/stable/c/82f7416bcbd951549e758d15fc1a96a5afc2e900\"}, {\"url\": \"https://git.kernel.org/stable/c/7a93edb23bcf07a3aaf8b598edfc2faa8fbcc0b6\"}, {\"url\": \"https://git.kernel.org/stable/c/635bc4def026a24e071436f4f356ea08c0eed6ff\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nfsnotify: do not generate ACCESS/MODIFY events on child for special files\\n\\ninotify/fanotify do not allow users with no read access to a file to\\nsubscribe to events (e.g. IN_ACCESS/IN_MODIFY), but they do allow the\\nsame user to subscribe for watching events on children when the user\\nhas access to the parent directory (e.g. /dev).\\n\\nUsers with no read access to a file but with read access to its parent\\ndirectory can still stat the file and see if it was accessed/modified\\nvia atime/mtime change.\\n\\nThe same is not true for special files (e.g. /dev/null). Users will not\\ngenerally observe atime/mtime changes when other users read/write to\\nspecial files, only when someone sets atime/mtime via utimensat().\\n\\nAlign fsnotify events with this stat behavior and do not generate\\nACCESS/MODIFY events to parent watchers on read/write of special files.\\nThe events are still generated to parent watchers on utimensat(). This\\ncloses some side-channels that could be possibly used for information\\nexfiltration [1].\\n\\n[1] https://snee.la/pdf/pubs/file-notification-attacks.pdf\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.248\", \"versionStartIncluding\": \"2.6.36\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.198\", \"versionStartIncluding\": \"2.6.36\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.160\", \"versionStartIncluding\": \"2.6.36\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.120\", \"versionStartIncluding\": \"2.6.36\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.64\", \"versionStartIncluding\": \"2.6.36\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.3\", \"versionStartIncluding\": \"2.6.36\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19\", \"versionStartIncluding\": \"2.6.36\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T21:53:22.202Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2025-68788\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-08T08:43:30.378Z\", \"dateReserved\": \"2025-12-24T10:30:51.037Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-01-13T15:29:01.270Z\", \"assignerShortName\": \"Linux\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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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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