CVE-2026-88265 (GCVE-0-2026-88265)
Vulnerability from cvelistv5 – Published: 2026-09-10 08:57 – Updated: 2026-09-10 08:57
VLAI
EPSS
VEX
Title
Crun: crun: /dev/null symlink follow during stdio reopen allows host bind-mount write and chown
Summary
A flaw was found in crun. After pivot_root, reopening /dev/null for stdio can follow a symlink and attach a host file to container stdio, then change that file's ownership. Affected versions are crun 1.29.1 and earlier. Default configurations that mount a fresh /dev are not exposed. No fixed release is available yet.
Severity
5.6 (Medium)
CWE
- CWE-59 - Improper Link Resolution Before File Access ('Link Following')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://access.redhat.com/security/cve/CVE-2026-88265 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2531224 | issue-trackingx_refsource_REDHAT |
| https://github.com/containers/crun/ |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Red Hat | Red Hat Hardened Images |
cpe:/a:redhat:hummingbird:1
|
Date Public
2026-09-09 00:00
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"workarounds": [
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"value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."
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"x_redhatCweChain": "CWE-59: Improper Link Resolution Before File Access (\u0027Link Following\u0027)"
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"cveMetadata": {
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"datePublished": "2026-09-10T08:57:03.229Z",
"dateReserved": "2026-09-10T01:57:19.212Z",
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"state": "PUBLISHED"
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"dataType": "CVE_RECORD",
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"vulnerability-lookup:meta": {
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"redhat_vex": {
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"cve": "CVE-2026-88265",
"id": "CVE-2026-88265",
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"product_status:known_affected": "1",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "crun: crun: /dev/null symlink follow during stdio reopen allows host bind-mount write and chown",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-88265.json",
"version": "3"
}
}
}
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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.
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.
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