A flaw was found in sssd, specifically within the PAM (Pluggable Authentication Modules) responder's protocol v1 parser, pam_parse_in_data(). A local client with access to the PAM responder's UNIX socket can exploit this by negotiating protocol v1 and sending an empty or truncated PAM request body. This can trigger an out-of-bounds read, potentially causing the PAM responder to terminate or restart, leading to a local denial of service.

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Advisories

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Fixes

Solution

No solution given by the vendor.


Workaround

Restrict local access to the PAM responder UNIX socket, typically located at `/var/lib/sss/pipes/pam`, to only trusted users and processes. This can be achieved by adjusting file system permissions on the socket file.

History

Tue, 15 Sep 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Mon, 14 Sep 2026 21:00:00 +0000

Type Values Removed Values Added
Description A flaw was found in sssd, specifically within the PAM (Pluggable Authentication Modules) responder's protocol v1 parser, pam_parse_in_data(). A local client with access to the PAM responder's UNIX socket can exploit this by negotiating protocol v1 and sending an empty or truncated PAM request body. This can trigger an out-of-bounds read, potentially causing the PAM responder to terminate or restart, leading to a local denial of service.
Title Sssd: sssd: denial of service via malformed pam v1 requests
First Time appeared Redhat
Redhat enterprise Linux
Redhat openshift
Weaknesses CWE-125
CPEs cpe:/a:redhat:openshift:4
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
Redhat openshift
References
Metrics cvssV3_1

{'score': 4, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-09-14T17:37:01.062Z

Reserved: 2026-09-14T14:33:31.717Z

Link: CVE-2026-90994

cve-icon Vulnrichment

Updated: 2026-09-14T16:30:11.651Z

cve-icon NVD

Status : Received

Published: 2026-09-14T16:17:42.220

Modified: 2026-09-14T17:17:57.340

Link: CVE-2026-90994

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-09-14T14:36:00Z

Links: CVE-2026-90994 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-15T13:15:18Z

Weaknesses