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SSSD CVE-2026-6245

| EUVDEUVD-2026-23032 MEDIUM
Buffer Access with Incorrect Length Value (CWE-805)
2026-04-15 redhat
5.5
CVSS 3.1 · Vendor: redhat
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Severity by source

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

Requires local authenticated access with low privileges; high availability impact from a crash.

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

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

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

Lifecycle Timeline

4
Analysis Generated
Jul 26, 2026 - 15:20 vuln.today
Patch released
Apr 19, 2026 - 14:30 nvd
Patch available
EUVD ID Assigned
Apr 15, 2026 - 19:15 euvd
EUVD-2026-23032
CVE Published
Apr 15, 2026 - 18:35 nvd
MEDIUM 5.5

DescriptionCVE.org

A flaw was found in the System Security Services Daemon (SSSD). The pam_passkey_child_read_data() function within the PAM passkey responder fails to properly handle raw bytes received from a pipe. Because the data is treated as a NUL-terminated C string without explicit termination, it results in an out-of-bounds read when processed by functions like snprintf(). A local attacker could potentially trigger this vulnerability by initiating a crafted passkey authentication request, causing the SSSD PAM responder to crash, resulting in a local Denial of Service (DoS).

AnalysisAI

Local denial of service in SSSD's PAM passkey responder allows a low-privileged attacker to crash the daemon by sending crafted passkey authentication data, disrupting authentication services on affected Red Hat Enterprise Linux and OpenShift systems. The vulnerability is not known to be actively exploited, and its EPSS score is negligible (0.01%).

Technical ContextAI

The vulnerability resides in the pam_passkey_child_read_data() function of the SSSD PAM passkey responder, which handles passkey authentication over a pipe. Data is read as raw bytes but processed as a NUL-terminated C string without explicit termination, causing an out-of-bounds read when passed to functions like snprintf(). This is classified as CWE-805 (Buffer Access with Incorrect Length Value). Affected systems include Red Hat Enterprise Linux 6-10 and Red Hat OpenShift Container Platform 4, where SSSD is the default identity provider daemon for central authentication.

RemediationAI

Apply the patch released by Red Hat, as detailed in the advisory at https://access.redhat.com/security/cve/CVE-2026-6245. The fix involves updated SSSD packages. If immediate patching is not possible, consider restricting local interactive access to trusted users only. This mitigation reduces but does not eliminate risk, as any low-privileged authenticated user can still trigger the crash. No other workarounds are documented.

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Micro 5.2 Fixed
SUSE Linux Enterprise Micro 5.3 Fixed
SUSE Linux Enterprise Micro 5.4 Fixed

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CVE-2026-6245 vulnerability details – vuln.today

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