CVE-2026-68743: Sssd: sssd: pam responder out-of-bounds read via unchecked auth_token_length in protocol v1

Severity: high (CVSS 7.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-04 · updated 2026-08-31
Weakness: CWE-125

Description

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.

Affected products

[UNKNOWN] sssd: all versions
Red Hat Enterprise Linux: 7.0, 8.0, 9.0, 10.0
Red Hat OpenShift Container Platform 4.18: 4.0

References

https://access.redhat.com/security/cve/CVE-2026-68743
https://bugzilla.redhat.com/show_bug.cgi?id=2509760

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