Description
A flaw was found in SSSD. An issue in the Kerberos Credential Manager (KCM) responder allows a local user to cause a Denial of Service (DoS) by maintaining a persistent connection and repeatedly storing and destroying credentials. Because the service fails to release cached objects from memory when credentials are removed, memory consumption grows continuously, ultimately exhausting available memory and rendering the service unresponsive.
Published: 2026-10-06
Score: 5.5 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Remediation

Vendor Workaround

This issue can only be exploited when the SSSD KCM responder is enabled and reachable by a local user, so mitigation focuses on limiting that exposure. On systems that do not require KCM credential caching, disable the KCM responder by stopping and masking the sssd-kcm socket and service: # systemctl stop sssd-kcm.socket sssd-kcm.service # systemctl mask sssd-kcm.socket sssd-kcm.service Before disabling KCM, ensure an alternative Kerberos credential cache type (for example FILE: or KEYRING:) is configured in /etc/krb5.conf, because clients or system configurations that default to KCM: credential caches would otherwise lose Kerberos ticket management. On systems where KCM is required, restrict access to the KCM UNIX socket (/var/run/.heim_org.h5l.kcm-socket) to trusted local users where deployment policy permits. If abnormal memory growth is observed, closing the abusive client connection or restarting the sssd-kcm responder reclaims the retained connection-scoped memory; these are operational workarounds rather than a fix, and no released package fix is currently established.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

History

Thu, 08 Oct 2026 03:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 06 Oct 2026 21:15:00 +0000

Type Values Removed Values Added
First Time appeared Redhat openshift Container Platform
Sssd
Sssd sssd
Vendors & Products Redhat openshift Container Platform
Sssd
Sssd sssd

Tue, 06 Oct 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Tue, 06 Oct 2026 00:45:00 +0000

Type Values Removed Values Added
Description A flaw was found in SSSD. An issue in the Kerberos Credential Manager (KCM) responder allows a local user to cause a Denial of Service (DoS) by maintaining a persistent connection and repeatedly storing and destroying credentials. Because the service fails to release cached objects from memory when credentials are removed, memory consumption grows continuously, ultimately exhausting available memory and rendering the service unresponsive.
Title Sssd: sssd: denial of service via memory exhaustion in kcm responder
First Time appeared Redhat
Redhat enterprise Linux
Redhat openshift
Weaknesses CWE-772
CPEs cpe:/a:redhat:openshift:4
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
Redhat openshift
References
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}


Subscriptions

Redhat Enterprise Linux Openshift Openshift Container Platform
Sssd Sssd
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-10-16T10:57:33.917Z

Reserved: 2026-10-01T17:21:54.434Z

Link: CVE-2026-104035

cve-icon Vulnrichment

Updated: 2026-10-08T02:38:51.698Z

cve-icon NVD

Status : Undergoing Analysis

Published: 2026-10-06T01:16:34.420

Modified: 2026-10-08T03:16:32.840

Link: CVE-2026-104035

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-10-05T23:47:43Z

Links: CVE-2026-104035 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-10-06T20:56:22Z

Weaknesses
  • CWE-772

    Missing Release of Resource after Effective Lifetime