CVE-2026-3012

Summary

A flaw was found in Samba’s certificate auto-enrollment Group Policy handling. When certificate auto-enrollment is enabled, Samba may retrieve a CA certificate over an unencrypted HTTP connection and install it into the local trust store without proper verification. An attacker with the ability to intercept or redirect network traffic could exploit this behavior to supply a malicious certificate authority certificate, potentially allowing interception or spoofing of trusted communications.

Affected Software

VendorProductVersion RangeStatus
Red HatRed Hat Enterprise Linux 100:4.23.5-109.el10_2 < *unaffected
Red HatRed Hat Enterprise Linux 10.0 Extended Update Support0:4.21.3-114.el10_0.1 < *unaffected
Red HatRed Hat Enterprise Linux 80:4.19.4-16.el8_10 < *unaffected
Red HatRed Hat Enterprise Linux 80:4.19.4-16.el8_10 < *unaffected
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support0:4.15.5-16.el8_6.1 < *unaffected
Red HatRed Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On0:4.15.5-16.el8_6.1 < *unaffected
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Service0:4.17.5-7.el8_8.1 < *unaffected
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutions0:4.17.5-7.el8_8.1 < *unaffected
Red HatRed Hat Enterprise Linux 90:4.23.5-10.el9_8 < *unaffected
Red HatRed Hat Enterprise Linux 90:4.23.5-10.el9_8 < *unaffected
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP Solutions0:4.17.5-105.el9_2.5 < *unaffected
Red HatRed Hat Enterprise Linux 9.4 Update Services for SAP Solutions0:4.19.4-105.el9_4.4 < *unaffected
Red HatRed Hat Enterprise Linux 9.6 Extended Update Support0:4.21.3-14.el9_6.1 < *unaffected
Red HatRed Hat OpenShift Container Platform 4.194.19.9.6.202606241344-0 < *unaffected

Weaknesses

  • CWE-345: Insufficient Verification of Data Authenticity

Workarounds

Systems are not affected unless Samba Group Policy processing and certificate auto-enrollment are explicitly enabled.

Administrators can reduce exposure by:

Avoiding unnecessary use of certificate auto-enrollment. Ensuring your "smb.conf" does not contain a line like apply group policies = yes. If , group policy is not be enabled, the vulnerable code will not run.

Intercepting the HTTP request requires some control over the local network or other devices to intercept or redirect traffic. Some network administrators might assess this as a low risk on their networks.

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

samba: group policy certificate enrollment uses http:// without validation

Additional References

References