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Vulnerability · Published Oct 6, 2026 · Assigned by redhat

CVE-2026-104038Sssd: sssd: denial of service via missing sid extension in certificate mapping

Medium 5.9

In plain English

A medium-severity null pointer dereference in Red Hat Enterprise Linux 10 from Red Hat. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 19% of all known vulnerabilities).

Severity (CVSS 3.1)5.9Medium
Exploit odds (30 days)0.3%top 81.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

A flaw was found in sssd. A remote attacker can cause a denial of service (DoS) by submitting a certificate that lacks an expected Security Identifier (SID) extension. In deployments configured with SID-based certificate mapping rules, the service fails to verify the presence of the extension before processing it, causing the process to crash during authentication or lookup operations.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12sssdno fix listedDEBIAN-CVE-2026-104038
Debian:13sssdno fix listedDEBIAN-CVE-2026-104038
Ubuntu:22.04:LTSsssdno fix listedUBUNTU-CVE-2026-104038
Ubuntu:24.04:LTSsssdno fix listedUBUNTU-CVE-2026-104038
Ubuntu:26.04:LTSsssdno fix listedUBUNTU-CVE-2026-104038
Ubuntu:26.10sssdno fix listedUBUNTU-CVE-2026-104038

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 6 see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat OpenShift Container Platform 4 see references
Red Hat Red Hat OpenShift Container Platform 4 see references
Red Hat Red Hat OpenShift Container Platform 5 see references

Weakness: CWE-476 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

References