Description
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).
Problem types
Buffer Access with Incorrect Length Value
Product status
Timeline
| 2026-04-13: | Reported to Red Hat. |
| 2026-04-15: | Made public. |
References
access.redhat.com/security/cve/CVE-2026-6245
bugzilla.redhat.com/show_bug.cgi?id=2457954 (RHBZ#2457954)