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
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| 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 Enterprise Linux 9 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 5 | — | — |
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 | 2.13.1-2 | — |
| Debian 13 | sssd | No fix yet | — |
| Debian 12 | sssd | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | sssd | 2.12.0-1ubuntu5.4 | USN-8718-1 |
| Ubuntu 24.04 LTS | sssd | 2.9.4-1.1ubuntu6.8 | USN-8718-1 |
| Ubuntu 22.04 LTS | sssd | 2.6.3-1ubuntu3.9 | USN-8718-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | sssd | 2.2.3-3ubuntu0.13+esm1 | USN-8718-1 |
| Ubuntu Pro 18.04 LTS | sssd | 1.16.1-1ubuntu1.8+esm1 | USN-8718-1 |
| Ubuntu Pro 16.04 LTS | sssd | 1.13.4-1ubuntu1.15+esm1 | USN-8718-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | sssd | 2.10.2-150700.9.40.1 | SUSE-SU-2026:3899-1 |
| SLES 15 SP6 | sssd | 2.10.2-150600.3.58.1 | SUSE-SU-2026:5079-1 |
| SLES 12 SP5 | sssd | 1.16.1-7.79.1 | SUSE-SU-2026:3797-1 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | sssd | 2.10.2-160000.5.1 | SUSE-SU-2026:23613-1 |
| SLES for SAP 15 SP6 | sssd | 2.10.2-150600.3.58.1 | SUSE-SU-2026:5079-1 |
| SLES 16.0 | sssd | 2.10.2-160000.5.1 | SUSE-SU-2026:23613-1 |
| SLE Micro 6.2 | sssd | 2.10.2-160000.5.1 | SUSE-SU-2026:23465-1 |
| SLE Micro 6.1 | sssd | 2.9.5-slfo.1.1_7.1 | SUSE-SU-2026:23347-1 |
| SLE Micro 6.0 | sssd | 2.8.2-10.1 | SUSE-SU-2026:23251-1 |
| SLE Micro 5.5 | sssd | 2.5.2-150500.10.49.1 | SUSE-SU-2026:4456-1 |
| SLE Micro 5.4 | sssd | 2.5.2-150400.4.51.1 | SUSE-SU-2026:4027-1 |
| SLE Micro 5.3 | sssd | 2.5.2-150400.4.51.1 | SUSE-SU-2026:4027-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 16.0 | sssd | 2.10.2-160000.5.1 | openSUSE-SU-2026:21748-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | sssd +32 | 2.9.4-1.amzn2023.0.5 | ALAS2023-2026-3416 |
Advisories 12
- ALAS2023-2026-3416 Moderate: sssd security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Nov 9, 2026
- SUSE-SU-2026:5079-1 Security update for sssd SUSE / openSUSE Security Updates · Nov 3, 2026
- SUSE-SU-2026:4456-1 Security update for sssd SUSE / openSUSE Security Updates · Oct 5, 2026
- SUSE-SU-2026:23613-1 Security update for sssd SUSE / openSUSE Security Updates · Sep 29, 2026
- SUSE-SU-2026:23465-1 Security update for sssd SUSE / openSUSE Security Updates · Sep 14, 2026
- SUSE-SU-2026:4027-1 Security update for sssd SUSE / openSUSE Security Updates · Sep 13, 2026
- SUSE-SU-2026:3899-1 Security update for sssd SUSE / openSUSE Security Updates · Sep 10, 2026
- SUSE-SU-2026:23347-1 Security update for sssd SUSE / openSUSE Security Updates · Sep 10, 2026
- openSUSE-SU-2026:21748-1 Security update for sssd SUSE / openSUSE Security Updates · Sep 9, 2026
- USN-8718-1 sssd vulnerability Ubuntu Security Notices (USN) · Sep 3, 2026
- SUSE-SU-2026:23251-1 Security update for sssd SUSE / openSUSE Security Updates · Aug 27, 2026
- SUSE-SU-2026:3797-1 Security update for sssd SUSE / openSUSE Security Updates · Aug 27, 2026
References
- https://access.redhat.com/security/cve/CVE-2026-68743 vdb-entry
- RHBZ#2509760 issue-tracking