CVE-2026-12610

Authentication disruption via stale certmap context

Published Jun 30, 2026 · Updated Jun 30, 2026

Use-after-free in Red Hat SSSD's PAM responder allows local users to crash authentication during YubiKey or PKCS#11 login. pam_check_cert_send stores the current sss_certmap_ctx in request state, but p11_refresh_certmap_ctx can free and replace it while p11_child is still running; p11_child_done then dereferences the stale pointer. Exploitation requires control of smartcard contents during an active authentication attempt; the demonstrated result is a responder crash.

CVSS severity6.4
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Red Hat SSSD's PAM responder allows local users to crash authentication during YubiKey or PKCS#11 login. pam_check_cert_send stores the current sss_certmap_ctx in request state, but p11_refresh_certmap_ctx can free and replace it while p11_child is still running; p11_child_done then dereferences the stale pointer. Exploitation requires control of smartcard contents during an active authentication attempt; the demonstrated result is a responder crash.

The record

CVE
CVE-2026-12610
Published
Jun 30, 2026
Updated
Jun 30, 2026
Vendor
389 Directory Server
Product
Red Hat Enterprise Linux 6
Classifications
CWE-825, T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jun 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 30, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

389 Directory Server · Red Hat Enterprise Linux 6Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 10Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 7Affected versions are unavailable in this record.
389 Directory Server · Red Hat OpenShift Container PlatformAffected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 8Affected versions are unavailable in this record.

Published CVSS scores

6.4Red HatCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-825Expired Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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