CVE-2026-6245 Sssd: out-of-bounds read in the sssd

What is CVE-2026-6245?

CVE-2026-6245 is a medium-severity memory corruption vulnerability in Redhat Enterprise Linux, published on 15 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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).

Weakness: CWE-805

Which versions are affected by CVE-2026-6245?

It affects 3 products.

Products include Fedoraproject Sssd, Redhat Enterprise Linux, Redhat Openshift Container Platform.

How do I fix CVE-2026-6245?

Apply the vendor's patch.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-6245 being exploited?

There is no known exploitation of CVE-2026-6245 in the wild and no public exploit code.

Other vulnerabilities in Redhat Enterprise Linux

• CVE-2022-4254 Other in SSSD High 8.8
• CVE-2012-3462 Auth bypass in sssd High 8.8
• CVE-2026-104048 Sssd: sssd: authorization bypass via cross-domain username collision in hbac evaluation Medium 6.8
• CVE-2015-5292 Denial of service in n/a Medium 6.8
• CVE-2026-12610 Sssd: use-after-free crash in sssd' 'sssd_pam' process Medium 6.4

All Redhat Enterprise Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2026-6245, GHSA-g672-w7xh-qp9j, OESA-2026-2169, OESA-2026-2170, OESA-2026-2171, UBUNTU-CVE-2026-6245 and 2 more.