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CVE-2026-84042— Crun: crun: rootful krun with passt executes container payload as host root

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.

crun 中存在一个缺陷。当 crun 使用 libkrun 编译，并以需要 root 权限的方式启动容器且启用 passt 网络（krun.use_passt）时，crun 可以以宿主机的 root 权限执行来自容器镜像的攻击者可控的载荷（payload）。该问题是在 crun 1.29 中引入的回归（regression），影响 crun >= 1.29 版本。

CVSS 7.8 · High

Possible ATT&CK Techniques 1 AI

T1069 · Permission Groups Discovery
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I. Basic Information for CVE-2026-84042

Vulnerability Information
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Vulnerability Title
Crun: crun: rootful krun with passt executes container payload as host root
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in crun. When crun is built with libkrun and a container is started rootful with passt networking (krun.use_passt), crun can execute attacker-controlled payload from the container image with host root privileges. The issue is a regression in crun 1.29. It affects crun >= 1.29
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
特权管理不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Hardened Images - cpe:/a:redhat:hummingbird:1

II. Public POCs for CVE-2026-84042

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III. Intelligence Information for CVE-2026-84042

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Other References for CVE-2026-84042 (3)

Same Patch Batch · Red Hat · 2026-09-10 · 5 CVEs total

CVE-2026-88770 6.5 MEDIUM Keycloak-services: keycloak-services: device authorization grant issues tokens to brute-fo
CVE-2026-88763 5.9 MEDIUM Skupper-router: skupper-router: unbounded recursion in amqp field parser leads to denial o
CVE-2026-88265 5.6 MEDIUM Crun: crun: /dev/null symlink follow during stdio reopen allows host bind-mount write and
CVE-2026-88264 5.6 MEDIUM Crun: crun: /dev/console symlink follow allows root-owned file creation outside the rootfs

IV. Related Vulnerabilities

Same product: Red Hat Hardened Images
Same vendor: Red Hat
Same weakness: CWE-269

V. Comments for CVE-2026-84042

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