A flaw was found in the sssd NSS responder. (CVE-2026-90463)
Description
A vulnerability in the sssd NSS responder allows a local attacker to cause an out-of-bounds read by sending specially crafted service lookup requests to the NSS responder's UNIX socket. This can lead to a denial of service (DoS) by crashing the NSS responder process. There is no evidence of privilege escalation or data disclosure. The issue affects multiple specific versions of sssd.
CVSS v3.1
Score 4.0medium
Affected software
pkg:deb/ubuntu/sssd?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/sssd?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/sssd?arch=source&distro=esm-infra/focalpkg:deb/ubuntu/sssd?arch=source&distro=jammypkg:deb/ubuntu/sssd?arch=source&distro=noblepkg:deb/ubuntu/sssd?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-90463 is an input validation flaw in the sssd NSS responder. A local attacker can send crafted service lookup requests to the NSS responder's UNIX socket, triggering an out-of-bounds read. This vulnerability can cause the NSS responder process to crash, resulting in a denial of service. The vulnerability does not allow privilege escalation or reliable data disclosure. The affected versions are explicitly enumerated and include various 1.x and 2.x sssd versions.
Potential Impact
The vulnerability allows local attackers to cause a denial of service by crashing the NSS responder process through an out-of-bounds read. There is no indication of privilege escalation or data leakage from this flaw.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to the NSS responder's UNIX socket to trusted users only to mitigate potential exploitation.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-90463
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:26.04:LTS"]
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ac80fdf2cdf04f65639c855
Added to database: 10/08/2026, 21:49:19 UTC
Last enriched: 10/08/2026, 22:38:15 UTC
Last updated: 10/08/2026, 22:38:15 UTC
Views: 8
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