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).

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1984 advisory.

    A flaw was found in sssd. When authenticating with a YubiKey, the SSSD PAM responder can crash due to a     use-after-free vulnerability, where a memory pointer is incorrectly handled. A local attacker could     exploit this flaw by manipulating smartcard or YubiKey contents, leading to a denial of service that     disrupts authentication. This vulnerability also presents a potential for privilege escalation, although     it is difficult to exploit. (CVE-2026-12610)

    A flaw was found in SSSD's LDAP sudo provider. When the ldap_sudo_search_base option is not explicitly     configured, SSSD searches the entire LDAP directory tree for sudoRole objects. An authenticated attacker     with write access to any subtree can inject a sudoRole object granting root-level sudo privileges on all     SSSD-enrolled hosts. (CVE-2026-14474)

    A path traversal flaw was found in SSSD's AD GPO provider. The ad_gpo_extract_smb_components() function     does not sanitize .. sequences in the gPCFileSysPath LDAP attribute, allowing an attacker with AD GPO     management access to write files outside the GPO cache directory as root. On default RHEL configurations     with SELinux enforcing, this can be used to inject Kerberos configuration leading to authentication     bypass. (CVE-2026-14476)

    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). (CVE-2026-6245)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 24.04 LTS / 25.10 / 26.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-8355-1 advisory.

    It was discovered that SSSD did not properly handle raw bytes in the PAM passkey responder. A local     attacker could possibly use this issue to cause the SSSD PAM responder to crash, resulting in a denial of     service.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote CentOS Linux 9 host has packages installed that are affected by a vulnerability as referenced in the sssd-2.9.9-1.el9 build changelog.

  - out-of-bounds read in the sssd (CVE-2026-6245)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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). (CVE-2026-6245)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
328460	Amazon Linux 2023 : libipa_hbac, libipa_hbac-devel, libsss_autofs (ALAS2023-2026-1984)	Nessus	Amazon Linux Local Security Checks	high
320487	Ubuntu 24.04 LTS / 25.10 / 26.04 LTS : SSSD vulnerability (USN-8355-1)	Nessus	Ubuntu Local Security Checks	medium
314430	CentOS 9 : sssd-2.9.9-1.el9	Nessus	CentOS Local Security Checks	medium
306567	Linux Distros Unpatched Vulnerability : CVE-2026-6245	Nessus	Misc.	medium

Detections

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CVE-2026-6245

medium

Tenable Plugins

high

medium

medium

medium