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

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SSSD 中发现了一个漏洞。在 Kerberos 凭据管理器（KCM）响应程序中，存在一个释放后使用（use-after-free）漏洞，该漏洞发生在 Kerberos 票据授予票据（TGT）续期过程中。具体来说，一个延迟回调访问了已经被释放的内存。具有可续期 Kerberos 票据的已认证本地用户可以在配置了 KCM 续期的系统上触发此问题，导致 KCM 响应程序服务崩溃，从而造成拒绝服务（DoS）。

CVSS 4.7 · Medium

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-104034

Vulnerability Information
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Vulnerability Title
Sssd: sssd: denial of service via use-after-free in kcm ticket renewal
Source: CVE Program / CVE List V5
Vulnerability 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).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
无效指针解引用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4

II. Public POCs for CVE-2026-104034

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III. Intelligence Information for CVE-2026-104034

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Vendor Advisories for CVE-2026-104034 (2)

Same Patch Batch · Red Hat · 2026-10-06 · 16 CVEs total

CVE-2026-92821 6.8 MEDIUM Sssd: sssd: access control bypass via premature ldap access rule evaluation
CVE-2026-104044 6.2 MEDIUM Sssd: sssd: denial of service via crafted passkey kerberos authentication request
CVE-2026-104038 5.9 MEDIUM Sssd: sssd: denial of service via missing sid extension in certificate mapping
CVE-2026-104036 5.8 MEDIUM Sssd: sssd: denial of service via out-of-bounds write in nfs idmap plugin
CVE-2026-104043 5.5 MEDIUM Sssd: sssd: denial of service via undersized packet parsing in nss responder
CVE-2026-104042 5.5 MEDIUM Sssd: sssd: denial of service via out-of-bounds read in pam responder
CVE-2026-104041 5.5 MEDIUM Sssd: sssd: denial of service via unbounded negative cache growth
CVE-2026-104037 5.5 MEDIUM Sssd: sssd: denial of service via packet length underflow in autofs responder
CVE-2026-104035 5.5 MEDIUM Sssd: sssd: denial of service via memory exhaustion in kcm responder
CVE-2026-104032 5.5 MEDIUM Sssd: sssd: denial of service via unprivileged autofs cache invalidation
CVE-2026-104031 5.5 MEDIUM Sssd: sssd: denial of service via memory exhaustion in autofs responder
CVE-2026-105305 5.4 MEDIUM Keycloak-services: keycloak-services: device authorization grant bypasses per-client minim
CVE-2026-104033 5.4 MEDIUM Sssd: sssd: access control bypass via improper ldap shadow expiration check
CVE-2026-104039 4.7 MEDIUM Sssd: sssd: denial of service via stale connection state reuse in pam gssapi responder
CVE-2026-104040 4.4 MEDIUM Sssd: sssd: information disclosure via odata injection in entra id lookups

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-825

V. Comments for CVE-2026-104034

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