Description
A flaw was found in SSSD. The sss_nss_protocol_fill_initgr() function in the NSS responder pre-allocates reply space for all group entries but does not shrink the packet when groups are skipped, causing uninitialized heap bytes to be transmitted to the client. A local attacker can exploit this to disclose cached directory data and heap layout information from the sssd_nss process.
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 26.10 | sssd | No fix yet | — |
| Ubuntu 26.04 LTS | sssd | No fix yet | — |
| Ubuntu 24.04 LTS | sssd | No fix yet | — |
| Ubuntu 22.04 LTS | sssd | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | sssd | No fix yet | — |
| Ubuntu Pro 18.04 LTS | sssd | No fix yet | — |
| Ubuntu Pro 16.04 LTS | sssd | No fix yet | — |
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 |
Show 6 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 |
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 8
- 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-2026:23613-1 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-2026:3899-1 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
- SUSE-SU-2026:23251-1 Security update for sssd SUSE / openSUSE Security Updates · Aug 27, 2026
References
- https://access.redhat.com/security/cve/CVE-2026-68744 vdb-entry
- RHBZ#2509761 issue-tracking