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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Local low-privileged user
  2. Delivery
    Craft malformed passkey data
  3. Exploit
    Send raw bytes via pipe to SSSD PAM passkey child
  4. Execution
    Trigger out-of-bounds read in snprintf()
  5. Persist
    SSSD PAM responder crashes
  6. Impact
    Authentication service disruption

Vulnerability Assessment

Weakness
CWE
CWE-805
ASVS 5.0
V15 - Secure Coding and Architecture Buffer access bounds checking
Exploitation Conditions

Local, authenticated access (low-privileged user required) with the ability to initiate passkey authentication requests. The PAM passkey responder must be active, which is the default configuration on affected SSSD installations. No user interaction or special privileges beyond a standard local account are needed. Exploitation is limited to a denial of service; no arbitrary code execution, privilege escalation, or data exposure results.
Impact

CVSS 3.1 scores this at 5.5 with a local attack vector (AV:L), low complexity (AC:L), low privileges (PR:L), and no user interaction (UI:N). Impact is confined to availability (A:H) with no confidentiality or integrity impact (C:N/I:N). The EPSS probability is 0.01% (1st percentile), indicating near-zero likelihood of exploitation. SSVC decision framework rates exploitation as 'none', automatable as 'no', and technical impact as 'partial', reinforcing a low real-world risk. No public exploit code or active exploitation has been reported. This is a local DoS requiring authenticated access, significantly limiting its severity compared to remote code-execution flaws.
Exploit ScenarioDerived

A logged-in low-privileged user crafts a malformed passkey authentication request that sends uncontrolled raw bytes through the pipe to the SSSD PAM passkey child process, causing an out-of-bounds read and daemon crash, which results in a temporary inability to authenticate any user on the system.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Jul 26, 2026

Local denial of service in SSSD's PAM passkey responder allows a low-privileged attacker to crash the daemon by sending crafted passkey authentication data, disrupting authentication services on affected Red Hat Enterprise Linux and OpenShift systems. The vulnerability is not known to be actively exploited, and its EPSS score is negligible (0.01%).

RemediationAI

Apply the patch released by Red Hat, as detailed in the advisory at https://access.redhat.com/security/cve/CVE-2026-6245. The fix involves updated SSSD packages. If immediate patching is not possible, consider restricting local interactive access to trusted users only. This mitigation reduces but does not eliminate risk, as any low-privileged authenticated user can still trigger the crash. No other workarounds are documented.

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Technical ContextAI · show details

The vulnerability resides in the pam_passkey_child_read_data() function of the SSSD PAM passkey responder, which handles passkey authentication over a pipe. Data is read as raw bytes but processed as a NUL-terminated C string without explicit termination, causing an out-of-bounds read when passed to functions like snprintf(). This is classified as CWE-805 (Buffer Access with Incorrect Length Value). Affected systems include Red Hat Enterprise Linux 6-10 and Red Hat OpenShift Container Platform 4, where SSSD is the default identity provider daemon for central authentication.

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Severity by source

Vendor (redhat) PRIMARY 5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
vuln.today AI 5.5 MEDIUM

Requires local authenticated access with low privileges; high availability impact from a crash.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE MEDIUM
Red Hat 5.5 MEDIUM

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

2
Patch released
Apr 19, 2026 - 14:30 nvd
Patch available
CVE Published
Apr 15, 2026 - 18:35 nvd
MEDIUM 5.5

DescriptionCVE.org

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).

Threat Intelligence Overview

EPSS Score
0.0%
Top 99% exploitable
Prevalence
High
core identity management daemon in RHEL environments
Data Quality
6 sources
Confidence: High
EUVD NVD CVE.org EPSS Vulnrichment Vendor

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.0%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation
None
System Exposure· derived
Small
Automatable
No
Human Impact· derived
High
Technical Impact
Partial

Priority Score

28
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +28
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Affected Products (CPE)CVE.org

cpe:2.3:a:red_hat:red_hat_enterprise_linux_10:*:*:*:*:*:*:*:*
cpe:2.3:a:red_hat:red_hat_enterprise_linux_6:*:*:*:*:*:*:*:*
cpe:2.3:a:red_hat:red_hat_enterprise_linux_7:*:*:*:*:*:*:*:*
cpe:2.3:a:red_hat:red_hat_enterprise_linux_8:*:*:*:*:*:*:*:*
cpe:2.3:a:red_hat:red_hat_enterprise_linux_9:*:*:*:*:*:*:*:*
cpe:2.3:a:red_hat:red_hat_openshift_container_platform_4:*:*:*:*:*:*:*:*

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Same weakness CWE-805 – Buffer Access with Incorrect Length Value

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CVE-2025-58774 HIGH
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Same technique Buffer Overflow

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Micro 5.2 Fixed
SUSE Linux Enterprise Micro 5.3 Fixed
SUSE Linux Enterprise Micro 5.4 Fixed

References

Advisories & patches
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-6245 REF https://access.redhat.com/security/cve/CVE-2026-6245 REF https://bugzilla.redhat.com/show_bug.cgi?id=2457954

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