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crun CVE-2026-88264

| EUVDEUVD-2026-75327 MEDIUM
Improper Link Resolution Before File Access (CWE-59)
2026-09-10 redhat GHSA-ppgw-cqj8-9qrg
5.6
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
5.6 MEDIUM
AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N
vuln.today AI
5.6 MEDIUM

Local vector confirmed by container-local access requirement; AC:H because exploitation requires non-default /dev omission; S:C because the write escapes container boundary to the host; C:N because no data is read.

3.1 AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N
4.0 AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
High
Availability
None

Lifecycle Timeline

2
Metadata Corrected
Sep 10, 2026 - 09:40 vuln.today
tag: Information Disclosure removed
Analysis Generated
Sep 10, 2026 - 09:21 vuln.today

DescriptionCVE.org

A flaw was found in crun. When the container configuration does not give /dev a dedicated mount, terminal setup can redirect /dev/console onto an attacker-controlled path, including via the read-only-rootfs bind-mount fallback. 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.

AnalysisAI

Integrity escape in crun 1.29.1 and earlier allows a low-privileged local attacker to redirect /dev/console to an attacker-controlled filesystem path, breaking container boundary isolation. The flaw (CWE-59, improper link resolution) triggers during terminal setup when a container configuration omits a dedicated /dev mount, including via the read-only-rootfs bind-mount fallback path, resulting in a scope-changed integrity impact on the host. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Execution
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires all three of the following conditions simultaneously: (1) the container OCI configuration must omit a dedicated /dev mount - the default OCI runtime behavior of mounting a fresh /dev tmpfs is explicitly NOT vulnerable per vendor statement; (2) the attacking process must have low-privileged local access within the affected container (PR:L from CVSS); and (3) terminal/console setup (tty allocation) must be triggered during container initialization. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 vector (AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N, score 5.6) captures the key constraints accurately: local access only, high complexity driven by the non-default /dev configuration requirement, and a scope-changed high-integrity impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation No vendor-released patch is available at time of analysis. … Detailed patch versions, workarounds, and compensating controls in full report.

Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-88264 vulnerability details – vuln.today

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