Medium [CVE-2026-104041] Sssd: sssd: denial of service via unbounded negative cache growth
This medium-severity Red Hat Linux advisory covers CVE-2026-104041 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7.
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Summary
A flaw was found in SSSD. An unprivileged local user can repeatedly request lookups for nonexistent entries through the Name Service Switch (NSS) responder.
Because the negative cache does not limit the total number of stored entries and only removes expired records when an existing key is rechecked, the cache can grow without bound. This behavior can lead to memory exhaustion, resulting in a Denial of Service (DoS) as the responder becomes unresponsive or terminates.
This vulnerability is rated as Moderate impact because exploitation is confined to authenticated local accounts capable of issuing repeated failed lookups, restricting the blast radius strictly to host service availability rather than privilege escalation or data disclosure.
On Red Hat Enterprise Linux systems where SSSD handles local identity resolution, the responder socket is accessible to unprivileged users by default.
While sustained, distinct lookup misses can exhaust responder memory and disrupt host name service availability, the issue cannot be triggered remotely in standard configurations and does not compromise system integrity or confidentiality. Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-770.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 40 minutes 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 · medium-confidence parse· fetched 40 minutes ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 40 minutes ago·verify at source
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