CVE-2026-68743

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{"acknowledgement": "Red Hat would like to thank Vivek Parikh (BreachX Zero Day Labs) for reporting this issue.", "bugzilla": {"description": "sssd: sssd: PAM responder out-of-bounds read via unchecked auth_token_length in protocol v1", "id": "2509760", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2509760"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["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."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2026-68743", "public_date": "2026-08-03T07:34:52Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-68743\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-68743"], "statement": "This issue can only be triggered by a local attacker who can connect to the SSSD PAM responder unix socket and send crafted protocol v1 requests. The stock PAM client uses protocol v3 and is not affected by this path. On SSSD 2.10 and later, responders run as an unprivileged user; on earlier versions they may run as root. In either case, the impact is a denial of service of SSSD-mediated authentication. The sssd monitor may respawn the responder, but repeated crashes can lead to a persistent authentication outage for SSSD-managed users. This issue is distinct from CVE-2026-6245, which affects a different code path (pam_passkey_child_read_data).", "threat_severity": "Moderate"}

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