Medium [CVE-2026-90463] Sssd: local oob read in nss service request parsers (`sss_nss_protocol_parse_svc_name` / `sss_nss_protocol_parse_svc_port`)
This medium-severity Red Hat Linux advisory covers CVE-2026-90463 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 the sssd NSS responder. While unprivileged local clients can typically reach the socket, there is no evidence of privilege escalation or reliable data disclosure.
Red Hat severity: Low — CVSS 4 (CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L). Weakness: CWE-125.
Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat OpenShift Container Platform 4. Will not fix / out of support: Red Hat Enterprise Linux 6.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: libsss_autofs; Red Hat package: libsss_certmap; Red Hat package: libsss_nss_idmap-devel; Red Hat package: python3-libipa_hbac; and 27 more.
Affected products named by the advisory: Red Hat package: python3-libsss_nss_idmap; Red Hat package: python3-sss-murmur; Red Hat package: python3-sssdconfig; Red Hat package: sssd-ad; and 23 more.
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 2 hours 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 2 hours ago·verify at source
Mitigation checklist
- To reduce exposure, restrict access to the SSSD NSS responder UNIX socket (`/var/lib/sss/pipes/nss`) to trusted local clients. This can be achieved by enforcing stricter socket permissions or explicit UID restrictions. While this reduces the attack surface, the underlying parser bug remains. Changes to socket permissions may require a restart of the SSSD service to take effect.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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