Evidence used
- No CISA KEV confirmation is currently recorded.
- Exploitation requires an existing local or physical foothold with privileges.
- EPSS is 0.09% for the current model date.
BlackTreeCVE IntelligenceFull vulnerability report · 2026
CVE-2026-104034High confidence
Sssd: sssd: denial of service via use-after-free in kcm ticket renewal
Red Hat · Red Hat Enterprise Linux 10
4.7MediumCVSS 3.1
Scheduled
Fix not verifiedMedium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.
R
Open reassessment dashboard →Operational reassessment
Published severity in operational context
Published severityMedium→Operational priority:Low, lowered one band.downgradedsince 6 Oct 2026
Compensating controls
- Restrict local access and enforce least privilege on affected hosts.
- Monitor vendor guidance and exploitation sources for a material change.
Verification
- Confirm that the asset runs Red Hat Red Hat Enterprise Linux 10 and falls inside the recorded affected range.
- Recheck the vendor advisory before scheduling a change because no verified fixed version is currently retained.
- Validate exposure, authentication requirements and compensating controls in the actual environment.
- Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Distribution package intelligence
3 package statesRelease-specific package status
Debian findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.
Repository candidate not checked
A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.
| Distribution release | Source package | Vendor state | Fixed version | Evidence |
|---|---|---|---|---|
| Debian trixietrixie · source | sssd | Affected, no fix publishedDebian currently tracks this release as open. | Not published in this feed | Debian Security Tracker ↗Source updated 8 Oct 2026 |
| Debian bookwormbookworm · source | sssd | Affected, no fix publishedDebian currently tracks this release as open. | Not published in this feed | Debian Security Tracker ↗Source updated 8 Oct 2026 |
| Debian sidsid · source | sssd | Affected, no fix publishedDebian currently tracks this release as open. | Not published in this feed | Debian Security Tracker ↗Source updated 8 Oct 2026 |
Direct vendor intelligence
2 currentAuthoritative vendor CSAF and VEX advisories
Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.
CVE-2026-104034 · CSAF 2.0 · revision 2 · interimSUSE Product Security TeamCVE-2026-104034
The vendor explicitly identifies these products as affected by this CVE.
- libipa_hbac-devel as component of SUSE Linux Enterprise Desktop 15 SP7
- libipa_hbac0 as component of SUSE Linux Enterprise Desktop 15 SP7
- libsss_certmap-devel as component of SUSE Linux Enterprise Desktop 15 SP7
- libsss_certmap0 as component of SUSE Linux Enterprise Desktop 15 SP7
- libsss_idmap-devel as component of SUSE Linux Enterprise Desktop 15 SP7
- libsss_idmap0 as component of SUSE Linux Enterprise Desktop 15 SP7
- libsss_nss_idmap-devel as component of SUSE Linux Enterprise Desktop 15 SP7
- libsss_nss_idmap0 as component of SUSE Linux Enterprise Desktop 15 SP7
- libsss_simpleifp-devel as component of SUSE Linux Enterprise Desktop 15 SP7
- libsss_simpleifp0 as component of SUSE Linux Enterprise Desktop 15 SP7
- python3-sssd-config as component of SUSE Linux Enterprise Desktop 15 SP7
- sssd as component of SUSE Linux Enterprise Desktop 15 SP7
- Summary
- 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).
- Remediation
- No remediation text is recorded.
CVE-2026-104034 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitysssd: SSSD: Denial of Service via use-after-free in KCM ticket renewal
The vendor explicitly identifies these products as affected by this CVE.
- libipa_hbac as a component of Red Hat Enterprise Linux 10
- libsss_autofs as a component of Red Hat Enterprise Linux 10
- libsss_certmap as a component of Red Hat Enterprise Linux 10
- libsss_idmap as a component of Red Hat Enterprise Linux 10
- libsss_nss_idmap as a component of Red Hat Enterprise Linux 10
- libsss_nss_idmap-devel as a component of Red Hat Enterprise Linux 10
- libsss_sudo as a component of Red Hat Enterprise Linux 10
- python3-libipa_hbac as a component of Red Hat Enterprise Linux 10
- python3-libsss_nss_idmap as a component of Red Hat Enterprise Linux 10
- python3-sss as a component of Red Hat Enterprise Linux 10
- python3-sss-murmur as a component of Red Hat Enterprise Linux 10
- python3-sssdconfig as a component of Red Hat Enterprise Linux 10
- Summary
- 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).
- Remediation
- Fix deferred
Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.
Fix not verified01
What, why and how
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).
What
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).
Why
The product dereferences a pointer that contains a location for memory that was previously valid, but is no longer valid.
How
An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may disrupt the affected service.
What
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).
Why
The product dereferences a pointer that contains a location for memory that was previously valid, but is no longer valid.
How
An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may disrupt the affected service.
02
Exploit reality and attack path
CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.
Observed exploitation No confirmed evidence
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.
Public PoC / exploit material None recorded
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.
- Likely attack path
- local access → Expired Pointer Dereference → disrupt the affected service
- Attack surface
- Local
- Privileges required
- Low: a basic authenticated account is required
- User interaction
- None
- Attack complexity
- High: exploitation depends on specific conditions
- Security boundary
- Unchanged: impact remains within the vulnerable component's security authority
- Weakness
?
CWE means Common Weakness Enumeration: a standard category for the underlying weakness. - CWE-825 ↗
CWE-825: Expired Pointer Dereference. The product dereferences a pointer that contains a location for memory that was previously valid, but is no longer valid.
- CVSS vector
?
CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity. CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:HCommon Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.
AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACHighAttack complexity: Successful exploitation depends on specific conditions outside the attacker's direct control.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CNoneConfidentiality impact: No direct loss is represented by this metric.INoneIntegrity impact: No direct loss is represented by this metric.AHighAvailability impact: A successful attack can cause a major loss.- Post-exploitation / living off the land
- Stolen credentials, tokens and legitimate administration functions may provide continued access without deploying a large custom toolset.
03
Patch and workaround
Operational remediation based on structured source evidence.
- Status
?
Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change. - Fix not verified
- Affected
- libipa_hbac-devel as component of SUSE Linux Enterprise Desktop 15 SP7
- libipa_hbac0 as component of SUSE Linux Enterprise Desktop 15 SP7
- libsss_certmap-devel as component of SUSE Linux Enterprise Desktop 15 SP7
- libsss_certmap0 as component of SUSE Linux Enterprise Desktop 15 SP7
- libsss_idmap-devel as component of SUSE Linux Enterprise Desktop 15 SP7
- libsss_idmap0 as component of SUSE Linux Enterprise Desktop 15 SP7
- libsss_nss_idmap-devel as component of SUSE Linux Enterprise Desktop 15 SP7
- libsss_nss_idmap0 as component of SUSE Linux Enterprise Desktop 15 SP7
- libsss_simpleifp-devel as component of SUSE Linux Enterprise Desktop 15 SP7
- libsss_simpleifp0 as component of SUSE Linux Enterprise Desktop 15 SP7
- python3-sssd-config as component of SUSE Linux Enterprise Desktop 15 SP7
- sssd as component of SUSE Linux Enterprise Desktop 15 SP7
- sssd-32bit as component of SUSE Linux Enterprise Desktop 15 SP7
- sssd-ad as component of SUSE Linux Enterprise Desktop 15 SP7
- sssd-dbus as component of SUSE Linux Enterprise Desktop 15 SP7
- sssd-ipa as component of SUSE Linux Enterprise Desktop 15 SP7
- sssd-kcm as component of SUSE Linux Enterprise Desktop 15 SP7
- sssd-krb5 as component of SUSE Linux Enterprise Desktop 15 SP7
- sssd-krb5-common as component of SUSE Linux Enterprise Desktop 15 SP7
- sssd-ldap as component of SUSE Linux Enterprise Desktop 15 SP7
- sssd-proxy as component of SUSE Linux Enterprise Desktop 15 SP7
- sssd-tools as component of SUSE Linux Enterprise Desktop 15 SP7
- sssd-winbind-idmap as component of SUSE Linux Enterprise Desktop 15 SP7
- libipa_hbac-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS
- libipa_hbac0 as component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS
- libsss_certmap-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS
- libsss_certmap0 as component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS
- libsss_idmap-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS
- libsss_idmap0 as component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS
- libsss_nss_idmap-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS
- and 527 more
- Fixed
- No fixed version is explicitly recorded in the structured CVE data.
- Action
- No verified patch reference is present in the current structured sources. Check the vendor advisory before making a change.
- Workaround
- No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04
Evidence and provenance
Published 6 Oct 2026 · Last source change 6 Oct 2026, 14:47 UTC · CWE-825 · Expired Pointer Dereference
CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source FIRST · tracked since 2026-10-06
?
The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.European sourceENISA EUVD · EUVD-2026-92891
Product sourceVendor CSAF · SUSE Product Security Team
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD awaiting enrichment
Core structured fields are present and their contributing authorities are shown above.
Material change intelligence
View recent updates ↗What changed after publication
- ENISA EUVD mappingEUVD-2026-92891 was added to the official ENISA EUVD mapping for this CVE.ENISA EUVD ↗
- Before
- not recorded
- After
- {"euvdId":"EUVD-2026-92891"}
- Catalogue recordCVE added to the BlackTree catalogue.CNA ↗
Technical terms and abbreviations used in this report
- CVE
- Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
- CVSS
- Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
- EPSS
- Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
- CWE
- Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
- CNA
- CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
- CISA ADP
- Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
- NVD
- National Vulnerability Database: NIST's enrichment service for CVE records.
- CERT / CSIRT
- A computer security incident response team that publishes warnings or coordinates incident response.
- PoC
- Proof of concept: public material that demonstrates or helps reproduce exploitation.
- CSAF
- Common Security Advisory Framework: a machine-readable format for security advisories.
- LoTL
- Living off the land: abuse of legitimate tools or system functions during an attack.