UBUNTU-CVE-2026-6245

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Source

https://ubuntu.com/security/CVE-2026-6245

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6245.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-6245

Upstream

CVE-2026-6245

Downstream

USN-8355-1

Related

USN-8355-1

Published

2026-04-15T19:16:00Z

Modified

2026-06-01T19:00:12Z

Severity

5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

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).

References

Affected packages

Ubuntu:24.04:LTS / sssd

Package

Name: sssd
Purl: pkg:deb/ubuntu/sssd?arch=source&distro=noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

2.9.4-1.1ubuntu6.5

Affected versions

2.*

2.9.1-2ubuntu2

2.9.1-2ubuntu3

2.9.2-1ubuntu2

2.9.4-1ubuntu1

2.9.4-1.1ubuntu3

2.9.4-1.1ubuntu5

2.9.4-1.1ubuntu6

2.9.4-1.1ubuntu6.1

2.9.4-1.1ubuntu6.2

2.9.4-1.1ubuntu6.3

2.9.4-1.1ubuntu6.4

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libipa-hbac0t64",
            "binary_version": "2.9.4-1.1ubuntu6.5"
        },
        {
            "binary_name": "libnss-sss",
            "binary_version": "2.9.4-1.1ubuntu6.5"
        },
        {
            "binary_name": "libpam-sss",
            "binary_version": "2.9.4-1.1ubuntu6.5"
        },
        {
            "binary_name": "libsss-certmap0",
            "binary_version": "2.9.4-1.1ubuntu6.5"
        },
        {
            "binary_name": "libsss-idmap0",
            "binary_version": "2.9.4-1.1ubuntu6.5"
        },
        {
            "binary_name": "libsss-nss-idmap0",
            "binary_version": "2.9.4-1.1ubuntu6.5"
        },
        {
            "binary_name": "libsss-sudo",
            "binary_version": "2.9.4-1.1ubuntu6.5"
        },
        {
            "binary_name": "python3-libipa-hbac",
            "binary_version": "2.9.4-1.1ubuntu6.5"
        },
        {
            "binary_name": "python3-libsss-nss-idmap",
            "binary_version": "2.9.4-1.1ubuntu6.5"
        },
        {
            "binary_name": "python3-sss",
            "binary_version": "2.9.4-1.1ubuntu6.5"
        },
        {
            "binary_name": "sssd",
            "binary_version": "2.9.4-1.1ubuntu6.5"
        },
        {
            "binary_name": "sssd-ad",
            "binary_version": "2.9.4-1.1ubuntu6.5"
        },
        {
            "binary_name": "sssd-ad-common",
            "binary_version": "2.9.4-1.1ubuntu6.5"
        },
        {
            "binary_name": "sssd-common",
            "binary_version": "2.9.4-1.1ubuntu6.5"
        },
        {
            "binary_name": "sssd-dbus",
            "binary_version": "2.9.4-1.1ubuntu6.5"
        },
        {
            "binary_name": "sssd-idp",
            "binary_version": "2.9.4-1.1ubuntu6.5"
        },
        {
            "binary_name": "sssd-ipa",
            "binary_version": "2.9.4-1.1ubuntu6.5"
        },
        {
            "binary_name": "sssd-kcm",
            "binary_version": "2.9.4-1.1ubuntu6.5"
        },
        {
            "binary_name": "sssd-krb5",
            "binary_version": "2.9.4-1.1ubuntu6.5"
        },
        {
            "binary_name": "sssd-krb5-common",
            "binary_version": "2.9.4-1.1ubuntu6.5"
        },
        {
            "binary_name": "sssd-ldap",
            "binary_version": "2.9.4-1.1ubuntu6.5"
        },
        {
            "binary_name": "sssd-passkey",
            "binary_version": "2.9.4-1.1ubuntu6.5"
        },
        {
            "binary_name": "sssd-proxy",
            "binary_version": "2.9.4-1.1ubuntu6.5"
        },
        {
            "binary_name": "sssd-tools",
            "binary_version": "2.9.4-1.1ubuntu6.5"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6245.json"

Ubuntu:25.10 / sssd

Package

Name: sssd
Purl: pkg:deb/ubuntu/sssd?arch=source&distro=questing

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

2.10.1-2ubuntu5.2

Affected versions

2.*

2.10.1-2ubuntu4

2.10.1-2ubuntu5

2.10.1-2ubuntu5.1

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libipa-hbac0t64",
            "binary_version": "2.10.1-2ubuntu5.2"
        },
        {
            "binary_name": "libnss-sss",
            "binary_version": "2.10.1-2ubuntu5.2"
        },
        {
            "binary_name": "libpam-sss",
            "binary_version": "2.10.1-2ubuntu5.2"
        },
        {
            "binary_name": "libsss-certmap0",
            "binary_version": "2.10.1-2ubuntu5.2"
        },
        {
            "binary_name": "libsss-idmap0",
            "binary_version": "2.10.1-2ubuntu5.2"
        },
        {
            "binary_name": "libsss-nss-idmap0",
            "binary_version": "2.10.1-2ubuntu5.2"
        },
        {
            "binary_name": "libsss-sudo",
            "binary_version": "2.10.1-2ubuntu5.2"
        },
        {
            "binary_name": "python3-libipa-hbac",
            "binary_version": "2.10.1-2ubuntu5.2"
        },
        {
            "binary_name": "python3-libsss-nss-idmap",
            "binary_version": "2.10.1-2ubuntu5.2"
        },
        {
            "binary_name": "python3-sss",
            "binary_version": "2.10.1-2ubuntu5.2"
        },
        {
            "binary_name": "sssd",
            "binary_version": "2.10.1-2ubuntu5.2"
        },
        {
            "binary_name": "sssd-ad",
            "binary_version": "2.10.1-2ubuntu5.2"
        },
        {
            "binary_name": "sssd-ad-common",
            "binary_version": "2.10.1-2ubuntu5.2"
        },
        {
            "binary_name": "sssd-common",
            "binary_version": "2.10.1-2ubuntu5.2"
        },
        {
            "binary_name": "sssd-dbus",
            "binary_version": "2.10.1-2ubuntu5.2"
        },
        {
            "binary_name": "sssd-idp",
            "binary_version": "2.10.1-2ubuntu5.2"
        },
        {
            "binary_name": "sssd-ipa",
            "binary_version": "2.10.1-2ubuntu5.2"
        },
        {
            "binary_name": "sssd-kcm",
            "binary_version": "2.10.1-2ubuntu5.2"
        },
        {
            "binary_name": "sssd-krb5",
            "binary_version": "2.10.1-2ubuntu5.2"
        },
        {
            "binary_name": "sssd-krb5-common",
            "binary_version": "2.10.1-2ubuntu5.2"
        },
        {
            "binary_name": "sssd-ldap",
            "binary_version": "2.10.1-2ubuntu5.2"
        },
        {
            "binary_name": "sssd-passkey",
            "binary_version": "2.10.1-2ubuntu5.2"
        },
        {
            "binary_name": "sssd-proxy",
            "binary_version": "2.10.1-2ubuntu5.2"
        },
        {
            "binary_name": "sssd-tools",
            "binary_version": "2.10.1-2ubuntu5.2"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6245.json"

Ubuntu:26.04:LTS / sssd

Package

Name: sssd
Purl: pkg:deb/ubuntu/sssd?arch=source&distro=resolute

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

2.12.0-1ubuntu5.1

Affected versions

2.*

2.10.1-2ubuntu5

2.10.1-2ubuntu7

2.12.0-1ubuntu3

2.12.0-1ubuntu4

2.12.0-1ubuntu5

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libipa-hbac0t64",
            "binary_version": "2.12.0-1ubuntu5.1"
        },
        {
            "binary_name": "libnss-sss",
            "binary_version": "2.12.0-1ubuntu5.1"
        },
        {
            "binary_name": "libpam-sss",
            "binary_version": "2.12.0-1ubuntu5.1"
        },
        {
            "binary_name": "libsss-certmap0",
            "binary_version": "2.12.0-1ubuntu5.1"
        },
        {
            "binary_name": "libsss-idmap0",
            "binary_version": "2.12.0-1ubuntu5.1"
        },
        {
            "binary_name": "libsss-nss-idmap0",
            "binary_version": "2.12.0-1ubuntu5.1"
        },
        {
            "binary_name": "libsss-sudo",
            "binary_version": "2.12.0-1ubuntu5.1"
        },
        {
            "binary_name": "python3-libipa-hbac",
            "binary_version": "2.12.0-1ubuntu5.1"
        },
        {
            "binary_name": "python3-libsss-nss-idmap",
            "binary_version": "2.12.0-1ubuntu5.1"
        },
        {
            "binary_name": "python3-sss",
            "binary_version": "2.12.0-1ubuntu5.1"
        },
        {
            "binary_name": "sssd",
            "binary_version": "2.12.0-1ubuntu5.1"
        },
        {
            "binary_name": "sssd-ad",
            "binary_version": "2.12.0-1ubuntu5.1"
        },
        {
            "binary_name": "sssd-ad-common",
            "binary_version": "2.12.0-1ubuntu5.1"
        },
        {
            "binary_name": "sssd-common",
            "binary_version": "2.12.0-1ubuntu5.1"
        },
        {
            "binary_name": "sssd-dbus",
            "binary_version": "2.12.0-1ubuntu5.1"
        },
        {
            "binary_name": "sssd-idp",
            "binary_version": "2.12.0-1ubuntu5.1"
        },
        {
            "binary_name": "sssd-ipa",
            "binary_version": "2.12.0-1ubuntu5.1"
        },
        {
            "binary_name": "sssd-kcm",
            "binary_version": "2.12.0-1ubuntu5.1"
        },
        {
            "binary_name": "sssd-krb5",
            "binary_version": "2.12.0-1ubuntu5.1"
        },
        {
            "binary_name": "sssd-krb5-common",
            "binary_version": "2.12.0-1ubuntu5.1"
        },
        {
            "binary_name": "sssd-ldap",
            "binary_version": "2.12.0-1ubuntu5.1"
        },
        {
            "binary_name": "sssd-passkey",
            "binary_version": "2.12.0-1ubuntu5.1"
        },
        {
            "binary_name": "sssd-proxy",
            "binary_version": "2.12.0-1ubuntu5.1"
        },
        {
            "binary_name": "sssd-tools",
            "binary_version": "2.12.0-1ubuntu5.1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6245.json"