Low [CVE-2026-68744] NSS responder uninitialized heap disclosure in initgroups reply
This low-severity Red Hat Linux advisory covers CVE-2026-68744 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
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Summary
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. This issue can only be triggered by a local attacker who can connect to the SSSD NSS responder unix socket.
Credentials, hashes, and tickets reside in separate sssd_pam and sssd_be processes and are not exposed by this flaw. Much of the directory data may already be obtainable via legitimate NSS queries depending on the deployment.
The primary security concern is disclosure of heap pointers that could assist ASLR bypass if chained with a separate memory-corruption vulnerability. Red Hat severity: Low — CVSS 3.3 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N).
Weakness: CWE-908. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat OpenShift Container Platform 4.
Red Hat lists Red Hat Enterprise Linux 6 as not affected. Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: sssd.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 26 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 26 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Official advisory · high-confidence parse· fetched 26 days ago·verify at source
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