---
id: CVE-2026-6245
title: A flaw was found in the System Security Services Daemon (SSSD)
summary: >-
  A flaw was found in the System Security Services Daemon (SSSD). The
  pam_passkey_child_read_data() function within the PAM passkey responder fails
  to properly handle raw bytes received from a pipe. Because the data is treated
  as a NUL-ter…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-805
vendor: fedoraproject
product: sssd
affected:
  - sssd
  - openshift_container_platform = 4.0
  - enterprise_linux = 6.0
  - enterprise_linux = 7.0
  - enterprise_linux = 8.0
  - enterprise_linux = 9.0
  - enterprise_linux = 10.0
published: '2026-04-15'
updated: '2026-08-12'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-6245'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-6245'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2457954'
    label: secalert@redhat.com
tags:
  - nvd
epss: 0.00149
epssPercentile: 0.0336
ingestedAt: '2026-08-13T13:03:06.091Z'
---

## Overview

A flaw was found in the System Security Services Daemon (SSSD). The pam_passkey_child_read_data() function within the PAM passkey responder fails to properly handle raw bytes received from a pipe. Because the data is treated as a NUL-terminated C string without explicit termination, it results in an out-of-bounds read when processed by functions like snprintf(). A local attacker could potentially trigger this vulnerability by initiating a crafted passkey authentication request, causing the SSSD PAM responder to crash, resulting in a local Denial of Service (DoS).

## Affected

- `sssd`
- `openshift_container_platform = 4.0`
- `enterprise_linux = 6.0`
- `enterprise_linux = 7.0`
- `enterprise_linux = 8.0`
- `enterprise_linux = 9.0`
- `enterprise_linux = 10.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.