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Back to active CVEs
Medium · CVSS 4.7CVE-2026-104034

Sssd: sssd: denial of service via use-after-free in kcm ticket renewalCVE-2026-104034

Answer in brief

CVE-2026-104034 records a Medium severity (CVSS 4.7) vulnerability in Sssd: sssd: denial of service via use-after-free in kcm ticket renewal. The current sources do not mark it as known exploited. The current feed maps Red Hat/openshift/ose-rhel-coreos-8 (generic), Red Hat/openshift/ose-rhel-coreos-9 (generic), Red Hat/sssd (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 6, 2026Updated Oct 6, 2026Source checked Oct 6, 2026First seen by HOL Oct 6, 2026Material review Oct 6, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 4.7
Exploitation
Not marked as known exploited
Affected software
3 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 4.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/openshift/ose-rhel-coreos-8 (generic), Red Hat/openshift/ose-rhel-coreos-9 (generic), Red Hat/sssd (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/openshift/ose-rhel-coreos-8generic*Not reported
Red Hat/openshift/ose-rhel-coreos-9generic*Not reported
Red Hat/sssdgeneric*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/openshift/ose-rhel-coreos-8, Red Hat/openshift/ose-rhel-coreos-9, Red Hat/sssd.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Oct 6, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 6, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 6, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
Upstream source description

A flaw was found in SSSD. A use-after-free vulnerability exists in the Kerberos Credential Manager (KCM) responder during Kerberos ticket-granting ticket (TGT) renewal, where a deferred callback accesses memory that has already been released. An authenticated local user with a renewable Kerberos ticket can trigger this issue on systems configured with KCM renewal, causing the KCM responder service to crash and resulting in a Denial of Service (DoS).

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Sssd: sssd: denial of service via memory exhaustion in autofs responderSame red hat/openshift/ose-rhel-coreos-8 package
  • Sssd: sssd: denial of service via unprivileged autofs cache invalidationSame red hat/openshift/ose-rhel-coreos-8 package
  • Sssd: sssd: access control bypass via improper ldap shadow expiration checkSame red hat/openshift/ose-rhel-coreos-8 package
  • Sssd: sssd: denial of service via memory exhaustion in kcm responderSame red hat/openshift/ose-rhel-coreos-8 package
  • Sssd: sssd: denial of service via out-of-bounds write in nfs idmap pluginSame red hat/openshift/ose-rhel-coreos-8 package
  • Sssd: sssd: denial of service via packet length underflow in autofs responderSame red hat/openshift/ose-rhel-coreos-8 package

Record context

Vulnerability class
Secret Exfiltration
EPSS
Not reported
CWE IDs
CWE-825
Source
CVE List V5
Source checked
Oct 6, 2026
References
2 linked sources
Open source record