Rhc: rhc: local privilege escalation via symlink following in rhc-canonical-facts.service

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-112210
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-19 12:17:01 UTC
Updated2026-10-19 21:03:27 UTC
DescriptionA flaw was found in the rhc-canonical-facts.service systemd unit shipped with rhc. The service runs as root and operates on a file inside a directory owned by an unprivileged system user without verifying that the file is not a symbolic link. A local attacker who has already compromised the privileged yggdrasil system service account can exploit this to gain ownership of arbitrary files, leading to privilege escalation to root.

Risk And Classification

Primary CVSS: v3.1 6 MEDIUM from [email protected]

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

Problem Types: CWE-59 | CWE-59 Improper Link Resolution Before File Access ('Link Following')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6MEDIUMCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
3.1CNACVSS6MEDIUMCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Red Hat Red Hat Enterprise Linux 10 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 7 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 8 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 9 Not specified Not specified

References

ReferenceSourceLinkTags
access.redhat.com/security/cve/CVE-2026-112210 [email protected] access.redhat.com
bugzilla.redhat.com/show_bug.cgi [email protected] bugzilla.redhat.com
github.com/RedHatInsights/rhc/blob/51928db/data/systemd/rhc-canonical-fa... [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Red Hat would like to thank D.M Sithum Vihanga for reporting this issue. (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-10-15T21:55:33.000ZReported to Red Hat.
CNA2026-10-15T21:55:33.000ZMade public.

Workarounds

CNA: Disable the rhc-canonical-facts timer to prevent automatic triggering of the vulnerable service: systemctl stop rhc-canonical-facts.timer systemctl disable rhc-canonical-facts.timer Note that this will prevent rhc from updating canonical facts automatically. The rhc connect command will still trigger the service manually.

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