Bug 2367852 (CVE-2025-47291)

Summary:	CVE-2025-47291 containerd: containerd CRI plugin: Incorrect cgroup hierarchy assignment for containers running in usernamespaced Kubernetes pods.
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	alcohan, anjoseph, aprice, bdettelb, brainfor, caswilli, crizzo, dfreiber, dhanak, doconnor, drow, dsimansk, dymurray, eglynn, fdeutsch, gparvin, jburrell, jcantril, jjoyce, jkoehler, jmatthew, jprabhak, jsamir, jschluet, jwendell, kaycoth, kingland, kshier, kverlaen, lgamliel, lhh, ljawale, lphiri, lsharar, lsvaty, lucarval, luizcosta, matzew, mburns, mgarciac, mnovotny, njean, nweather, oezr, omaciel, oramraz, owatkins, pahickey, periklis, pgrist, rbobbitt, rcernich, rfreiman, rhaigner, rjohnson, rojacob, sausingh, smullick, stcannon, sthirugn, stirabos, teagle, thason, vkrizan, vkumar, whayutin, wtam, yguenane
Target Milestone:	---	Keywords:	Security
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Hardware:	All
OS:	Linux
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Doc Text:	A vulnerability has been identified in containerd's Container Runtime Interface (CRI) implementation, affecting versions from 2.0.1 up to, but not including, 2.0.5. The flaw lies in the fact that containerd does not correctly place usernamespaced containers within the Kubernetes cgroup hierarchy. As a result, Kubernetes-defined resource limits for these containers are not properly enforced. This issue can lead to uncontrolled resource consumption by affected containers, potentially exhausting the resources of the Kubernetes node and resulting in a denial-of-service condition for the entire node.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
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Description OSIDB Bzimport 2025-05-21 18:02:07 UTC

containerd is an open-source container runtime. A bug was found in the containerd's CRI implementation where containerd, starting in version 2.0.1 and prior to version 2.0.5, doesn't put usernamespaced containers under the Kubernetes' cgroup hierarchy, therefore some Kubernetes limits are not honored. This may cause a denial of service of the Kubernetes node. This bug has been fixed in containerd 2.0.5+ and 2.1.0+. Users should update to these versions to resolve the issue. As a workaround, disable usernamespaced pods in Kubernetes temporarily.