Out-of-Bounds Read and Denial of Service in SSSD PAM Responder
CVE-2026-68743

5.5MEDIUM

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Vendor
CVE Published:
4 August 2026

What is CVE-2026-68743?

A vulnerability exists in the System Security Services Daemon (SSSD) due to improper validation of the auth_token_length field in the extract_authtok_v1() function within the PAM responder. This flaw can be exploited by a local attacker through a crafted protocol v1 request to the PAM responder socket. The result can be an out-of-bounds read, potentially leading to process crashes and service disruptions, thereby causing denial of service.

References

https://access.redhat.com/security/cve/CVE-2026-68743
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2509760
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
5.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Vivek Parikh (BreachX Zero Day Labs) for reporting this issue.
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