CVE-2026-6245
MEDIUMDescription
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).
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Exploit Intelligence
Low risk: more likely to be exploited than 4% of all known CVEs.
References
Related Vulnerabilities
Other CWE-805 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2020-14509 | Critical | 9.8 | 2.0% | - | Fix |
| CVE-2025-23319 | High | 8.1 | 1.6% | - | Fix |
| CVE-2024-24851 | High | 7.5 | 1.4% | - | - |
| CVE-2021-31885 | High | 7.5 | 1.2% | - | Fix |
| CVE-2023-20049 | High | 8.6 | 1.0% | - | Fix |
| CVE-2020-16101 | High | 7.5 | 1.0% | - | Fix |
Common questions
How do I fix CVE-2026-6245?
Upgrade sssd on ubuntu 24.04 to 2.9.4-1.1ubuntu6.5 or later.
Is CVE-2026-6245 being actively exploited?
Not that we know of. CVE-2026-6245 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.14% is the estimated probability that it will be exploited in the next 30 days. That is higher than 4% of all scored CVEs.
How severe is CVE-2026-6245?
CVE-2026-6245 has a CVSS v3 base score of 5.5, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2026-6245 affect?
Published advisories record a fix for sssd (Ubuntu). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
Embed a live status badge for CVE-2026-6245
Markdown
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-17.