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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
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Thu, 08 Oct 2026 03:30:00 +0000
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ssvc
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Tue, 06 Oct 2026 21:15:00 +0000
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| First Time appeared |
Redhat openshift Container Platform
Sssd Sssd sssd |
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| Vendors & Products |
Redhat openshift Container Platform
Sssd Sssd sssd |
Tue, 06 Oct 2026 12:15:00 +0000
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threat_severity
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threat_severity
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Tue, 06 Oct 2026 00:45:00 +0000
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| 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 |
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| 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 |
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| Vendors & Products |
Redhat
Redhat enterprise Linux Redhat openshift |
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cvssV3_1
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Status: PUBLISHED
Assigner: redhat
Published:
Updated: 2026-10-16T10:57:33.917Z
Reserved: 2026-10-01T17:21:54.434Z
Link: CVE-2026-104035
Updated: 2026-10-08T02:38:51.698Z
Status : Undergoing Analysis
Published: 2026-10-06T01:16:34.420
Modified: 2026-10-08T03:16:32.840
Link: CVE-2026-104035
OpenCVE Enrichment
Updated: 2026-10-06T20:56:22Z
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CWE-772
Missing Release of Resource after Effective Lifetime