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).
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | sssd | 2.13.1-1 | — |
| Debian 13 | sssd | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | sssd | 2.12.0-1ubuntu5.1 | USN-8355-1 |
| Ubuntu 25.10 | sssd | 2.10.1-2ubuntu5.2 | USN-8355-1 |
| Ubuntu 24.04 LTS | sssd | 2.9.4-1.1ubuntu6.5 | USN-8355-1 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | sssd +28 | 2.13.1-2.el10 | RLSA-2026:97077 |
| Rocky Linux 9 | sssd +32 | 2.9.9-3.el9 | RLSA-2026:97438 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | sssd | 2.13.0-1.1 | openSUSE-SU-2026:10659-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | sssd +32 | 2.9.4-1.amzn2023.0.4 | ALAS2023-2026-1984 |
Advisories 6
- RLSA-2026:97438 Moderate: sssd security, bug fix, and enhancement update Rocky Linux Security Advisories · Nov 13, 2026
- RLSA-2026:97077 Moderate: sssd security, bug fix, and enhancement update Rocky Linux Security Advisories · Nov 13, 2026
- WID-SEC-2026-4498 System Security Services Daemon (SSSD): Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 10, 2026
- ALAS2023-2026-1984 Important: sssd security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jul 20, 2026
- USN-8355-1 sssd vulnerability Ubuntu Security Notices (USN) · Jun 1, 2026
- openSUSE-SU-2026:10659-1 libipa_hbac-devel-2.13.0-1.1 on GA media SUSE / openSUSE Security Updates · Apr 30, 2026
References
- RHSA-2026:97077 vendor-advisory
- RHSA-2026:97438 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-6245 vdb-entry
- RHBZ#2457954 issue-tracking