Local service crash via unterminated pipe data
Published Apr 15, 2026 · Updated Apr 15, 2026
Out-of-bounds read in the SSSD PAM passkey responder allows local users to crash the responder through a crafted authentication request. The pam_passkey_child_read_data() function treats raw pipe bytes as a NUL-terminated string without appending a terminator, so snprintf() reads beyond the buffer. Exploitation requires a local low-privileged user who can initiate passkey authentication, and the reported consequence is interruption of PAM authentication when the responder crashes.
Summary
What happened
Out-of-bounds read in the SSSD PAM passkey responder allows local users to crash the responder through a crafted authentication request. The pam_passkey_child_read_data() function treats raw pipe bytes as a NUL-terminated string without appending a terminator, so snprintf() reads beyond the buffer. Exploitation requires a local low-privileged user who can initiate passkey authentication, and the reported consequence is interruption of PAM authentication when the responder crashes.
The record
- CVE
- CVE-2026-6245
- Published
- Apr 15, 2026
- Updated
- Apr 15, 2026
- Vendor
- 389 Directory Server
- Product
- Red Hat Enterprise Linux 6
- Classifications
- CWE-805, T1499.004
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 15, 2026CVE publishedPublication date reported by the CVE source.
- Apr 15, 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?
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What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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