CVE-2026-6245

Impact

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).

Affected products

Weakness classification

References

• NVD record
• CVE.org record
• https://access.redhat.com/security/cve/CVE-2026-6245
• https://bugzilla.redhat.com/show_bug.cgi?id=2457954