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SSSD CVE-2026-68743

| EUVDEUVD-2026-52865 HIGH
Out-of-bounds Read (CWE-125)
2026-08-04 redhat GHSA-3v6f-w66g-3mv6
Buffer Overflow Denial Of Service Information Disclosure Red Hat Enterprise Linux 10 Red Hat Enterprise Linux 6 Red Hat Enterprise Linux 7 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 9 Red Hat Openshift Container Platform 4 Red Hat
7.1
CVSS 3.1 · NVD
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Severity by source

Vendor (redhat) PRIMARY
MEDIUM
qualitative
NVD
7.1 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
vuln.today AI
7.1 HIGH

Local socket access requires low privileges; out-of-bounds read enables sensitive memory disclosure (C:H) and process crash (A:H) with no write impact.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Red Hat
5.5 MEDIUM
qualitative

Primary rating from Vendor (redhat).

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

Lifecycle Timeline

6
Analysis Updated
Aug 17, 2026 - 13:30 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Aug 17, 2026 - 13:22 vuln.today
cvss_changed
Severity Changed
Aug 17, 2026 - 13:22 NVD
MEDIUM HIGH
CVSS changed
Aug 17, 2026 - 13:22 NVD
5.5 (MEDIUM) 7.1 (HIGH)
Analysis Generated
Aug 04, 2026 - 19:21 vuln.today
CVE Published
Aug 04, 2026 - 18:37 cve.org
MEDIUM 5.5

DescriptionNVD

A flaw was found in SSSD. The extract_authtok_v1() function in the PAM responder does not validate the auth_token_length field against the remaining buffer size before processing. A local attacker can exploit this via a crafted protocol v1 request to the PAM responder socket, causing an out-of-bounds read and process crash, resulting in a denial of service.

AnalysisAI

Out-of-bounds read in SSSD's PAM responder allows a local low-privileged attacker to crash the SSSD process and disclose sensitive memory contents by sending a crafted protocol v1 authentication request. Affected systems span all major Red Hat Enterprise Linux releases (6 through 10) and OpenShift Container Platform 4, representing a broad footprint in enterprise Linux environments. No active exploitation is confirmed (not listed in CISA KEV), and the EPSS score of 0.14% at the 3rd percentile reflects a very low observed exploitation probability at time of analysis.

Technical ContextAI

SSSD (System Security Services Daemon) is the primary authentication and identity broker on Red Hat-based Linux systems, managing access to LDAP, Kerberos, and other identity backends. Its PAM responder component listens on a Unix domain socket, processing authentication requests on behalf of PAM-aware applications. The extract_authtok_v1() function handles protocol version 1 authentication token messages. CWE-125 (Out-of-bounds Read) describes the root cause: the function trusts the client-supplied auth_token_length field and uses it to index into the receive buffer without first verifying that the specified length does not exceed the remaining available bytes. On RHEL systems, SSSD runs as a system daemon with access to sensitive credential material, making any memory disclosure from this process potentially significant. CPE strings confirm impact across cpe:2.3:a:red_hat:red_hat_enterprise_linux_6 through _10 and cpe:2.3:a:red_hat:red_hat_openshift_container_platform_4.

RemediationAI

Apply the Red Hat-issued security update for SSSD via standard package management (dnf update sssd or yum update sssd) once an advisory with a fixed package version is published. Consult https://access.redhat.com/security/cve/CVE-2026-68743 for the official advisory and confirmed fixed versions - no specific patched package version was available in the data at time of analysis. As a compensating control pending patch, restrict access to the SSSD PAM responder socket (/var/lib/sss/pipes/private/pam) using filesystem ACLs or SELinux policy to limit which processes and users can send requests to it; this reduces the local attack surface but may impact legitimate PAM authentication flows. On OpenShift Container Platform 4, ensure node-level SSSD is updated via the MachineConfig operator following Red Hat guidance. The ENISA EUVD entry EUVD-2026-52865 may provide supplemental advisory detail.

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Same weakness CWE-125 – Out-of-bounds Read

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Micro 5.3 Affected
SUSE Linux Enterprise Micro 5.4 Affected
SUSE Linux Enterprise Micro 5.5 Affected

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CVE-2026-68743 vulnerability details – vuln.today
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