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CVE-2026-88265— Crun: crun: /dev/null symlink follow during stdio reopen allows host bind-mount write and chown

Quick assessment

Affected

Red Hat Red Hat Hardened Images

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Containers crun是Containers组织开源的一款轻量快速的容器运行时软件。 Containers crun 1.29.1及之前版本存在后置链接漏洞，该漏洞源于在pivot_root后重新打开/dev/null用于stdio时会跟随符号链接，可能导致将主机文件附加到容器stdio并更改该文件所有权。

CVSS 5.6 · Medium EPSS 0.12% · P2 Updated Oct 02, 2026

Possible ATT&CK Techniques 2 AI

T1055.004 · Asynchronous Procedure Call T1055 · Process Injection

Affected Version Matrix 7

Vendor	Product	Version Range	Status
Red Hat	Red Hat Enterprise Linux 10	`any`	affected
Red Hat	Red Hat Enterprise Linux 8	`any`	affected
Red Hat	Red Hat Enterprise Linux 9	`any`	affected
Red Hat	Red Hat Hardened Images	`1.30-1.hum1< *`	unaffected
Red Hat	Red Hat OpenShift Container Platform 4	`any`	affected
		`any`	affected
		`any`	affected

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I. Basic Information for CVE-2026-88265

Vulnerability Information

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Vulnerability Title

Crun: crun: /dev/null symlink follow during stdio reopen allows host bind-mount write and chown

Source: CVE Program / CVE List V5

Vulnerability Description

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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N

Source: CVE Program / CVE List V5

Vulnerability Type

在文件访问前对链接解析不恰当(链接跟随)

Source: CVE Program / CVE List V5

Vulnerability Title

Containers crun 后置链接漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor	Product	Affected Versions	CPE
Red Hat	Red Hat Hardened Images	1.30-1.hum1 ~ *	`cpe:/a:redhat:hummingbird:1`
Red Hat	Red Hat Enterprise Linux 10	-	`cpe:/o:redhat:enterprise_linux:10`
Red Hat	Red Hat Enterprise Linux 8	-	`cpe:/o:redhat:enterprise_linux:8`
Red Hat	Red Hat Enterprise Linux 9	-	`cpe:/o:redhat:enterprise_linux:9`
Red Hat	Red Hat OpenShift Container Platform 4	-	`cpe:/a:redhat:openshift:4`
Red Hat	Red Hat OpenShift Container Platform 4	-	`cpe:/a:redhat:openshift:4`
Red Hat	Red Hat OpenShift Container Platform 4	-	`cpe:/a:redhat:openshift:4`

II. Public POCs for CVE-2026-88265

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-88265

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Vendor Advisories for CVE-2026-88265 (3)

🔗 CVE-2026-88265 - Red Hat Customer Portal vdb-entry x_refsource_REDHAT
🔗 2531224 – (CVE-2026-88265) CVE-2026-88265 crun: crun: /dev/null symlink follow during stdio reopen allows host bind-mount write and chown issue-tracking x_refsource_REDHAT
🔗 RHSA-2026:71668 - Security Advisory - Red Hat Customer Portal vendor-advisory x_refsource_REDHAT

Vendor Pages for CVE-2026-88265 (1)

🔗 GitHub - containers/crun: A fast and lightweight fully featured OCI runtime and C library for running containers · GitHub

https://www.cve.org/CVERecord?id=CVE-2026-88265

Same Patch Batch · Red Hat · 2026-09-10 · 6 CVEs total

CVE-2026-84042	7.8 HIGH	Crun: crun: rootful krun with passt executes container payload as host root
CVE-2026-84828	6.5 MEDIUM	Pcs: pcs: non-root haclient users can read arbitrary files via pcs host auth --token
CVE-2026-88770	6.5 MEDIUM	Keycloak-services: keycloak-services: device authorization grant issues tokens to brute-fo
CVE-2026-88859	6.3 MEDIUM	Evolution: evolution: javascript execution via spoofed vcard control bypasses mail script-
CVE-2026-88763	5.9 MEDIUM	Skupper-router: skupper-router: unbounded recursion in amqp field parser leads to denial o

IV. Related Vulnerabilities

Same product: Red Hat Hardened Images

Same vendor: Red Hat

Same weakness: CWE-59