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sssd

CVE-2026-68743 is a medium severity vulnerability in the SSSD component of Red Hat Enterprise Linux 10. It involves an out-of-bounds read in the extract_authtok_v1() function of the PAM responder due to improper validation of the auth_token_length field. A local attacker with access to the PAM responder socket can send crafted protocol v1 requests to cause a denial of service by crashing the process. The vulnerability affects specific versions of SSSD as listed. No official fix or mitigation meeting Red Hat's criteria is currently available.

The vulnerability exists in the SSSD PAM responder's extract_authtok_v1() function, which fails to validate the auth_token_length field against the remaining buffer size before processing. This allows a local attacker who can connect to the PAM responder unix socket and send crafted protocol v1 requests to trigger an out-of-bounds read, leading to a process crash and denial of service. The issue only affects protocol v1 requests; the default PAM client uses protocol v3 and is not affected. On SSSD 2.10 and later, responders run as unprivileged users, reducing risk, but denial of service of SSSD-mediated authentication remains possible. The vulnerability is distinct from CVE-2026-6245 and is tracked under CWE-125 (Out-of-bounds Read).

Detailed information about A flaw was found in SSSD. The extract_authtok_v1() function in the PAM responder does not validate the auth_token_length field agains

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… (CVE-2026-68743) - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-68743: Out-of-bounds Read in Red Hat Red Hat Enterprise Linux 10

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