A flaw was found in SSSD. The sss_nss_protocol_parse_addr() function in the NSS responder does not validate the addrlen field against the remaining packet body size. A local attacker can exploit this via a crafted GETHOSTBYADDR request to the NSS responder socket, causing an out-of-bounds read and process crash, resulting in a denial of service.

The AlmaLinux 9.6 host has packages installed that are affected by a vulnerability as referenced in the TuxCare ALMALINUX9.6:CLSA-2026:1787733592 advisory.

  - A flaw was found in SSSD. The sss_nss_protocol_parse_addr() function in the NSS responder does not     validate the addrlen field against the remaining packet body size. A local attacker can exploit this via a     crafted GETHOSTBYADDR request to the NSS responder socket, causing an out-of-bounds read and process     crash, resulting in a denial of service. (CVE-2026-68742)

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

The Rocky Linux 9.6 host has packages installed that are affected by a vulnerability as referenced in the TuxCare ALMALINUX9.6:CLSA-2026:1787733592 advisory.

  - A flaw was found in SSSD. The sss_nss_protocol_parse_addr() function in the NSS responder does not     validate the addrlen field against the remaining packet body size. A local attacker can exploit this via a     crafted GETHOSTBYADDR request to the NSS responder socket, causing an out-of-bounds read and process     crash, resulting in a denial of service. (CVE-2026-68742)

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

The AlmaLinux 9.2 host has packages installed that are affected by a vulnerability as referenced in the TuxCare ALMALINUX9.2:CLSA-2026:1788162583 advisory.

  - A flaw was found in SSSD. The sss_nss_protocol_parse_addr() function in the NSS responder does not     validate the addrlen field against the remaining packet body size. A local attacker can exploit this via a     crafted GETHOSTBYADDR request to the NSS responder socket, causing an out-of-bounds read and process     crash, resulting in a denial of service. (CVE-2026-68742)

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

The remote openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21748-1 advisory.

    Security issues fixed:

    - CVE-2026-68742: insufficient validation in the NSS responder can lead to an out-of-bounds read and a     process crash       when a crafted GETHOSTBYADDR request is sent to the NSS responder socket (bsc#1273922).
    - CVE-2026-68743: insufficient validation in the PAM responder can lead to an out-of-bounds read and a     process crash       when a crafted protocol v1 request is processed (bsc#1273925).
    - CVE-2026-68744: improper memory management in the NSS responder can lead to uninitialized heap memory     disclosure       from the `sssd_nss` process (bsc#1273924).

    Other updates and bugfixes:

    - Add `systemd-tmpfiles` configuration file to populate `/var/lib/sss` with the correct permissions on     transactional       servers (bsc#1274748).

Tenable has extracted the preceding description block directly from the SUSE 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 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 SSSD. The sss_nss_protocol_parse_addr() function in the NSS responder does not     validate the addrlen field against the remaining packet body size. A local attacker can exploit this via a     crafted GETHOSTBYADDR request to the NSS responder socket, causing an out-of-bounds read and process     crash, resulting in a denial of service. (CVE-2026-68742)

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

ID	Name	Product	Family	Type	Severity
361093	AlmaLinux 9.6 [TuxCare] Security Update: libipa_hbac / libipa_hbac-devel / libsss_autofs / libsss_certmap / etc (ALMALINUX9.6:CLSA-2026:1787733592)	Nessus	Alma Linux Local Security Checks	Local	medium
360934	Rocky Linux 9.6 [TuxCare] Security Update: libipa_hbac / libipa_hbac-devel / libsss_autofs / libsss_certmap / etc (ALMALINUX9.6:CLSA-2026:1787733592)	Nessus	Rocky Linux Local Security Checks	Local	medium
360925	AlmaLinux 9.2 [TuxCare] Security Update: libipa_hbac / libipa_hbac-devel / libsss_autofs / libsss_certmap / etc (ALMALINUX9.2:CLSA-2026:1788162583)	Nessus	Alma Linux Local Security Checks	Local	medium
343953	openSUSE 16: libipa_hbac-devel / libipa_hbac0 / libnfsidmap-sss / etc (openSUSE-SU-2026:21748-1)	Nessus	SuSE Local Security Checks	Local	high
331690	Linux Distros Unpatched Vulnerability : CVE-2026-68742	Nessus	Misc.	Local	medium

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CVE-2026-68742

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