A flaw was found in SSSD. When configured with the LDAP access provider and `ldap_access_order` including `ppolicy` or `lockout`, a fail-open condition in the LDAP ppolicy access check can occur if a user lookup returns zero results. This can incorrectly return success and cache an allow decision, permitting continued authorization for a deleted or deprovisioned user. A remote attacker with prior valid account context could exploit this to maintain access to information and potentially make limited modifications to resources that should no longer be available.

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:5079-1 advisory.

    - CVE-2026-12610: cancelled or completed PAM request while the asynchronous child process is still running     can lead to a       use-after-free (bsc#1269807).
    - CVE-2026-68742: unvalidated address lengths in NSS responder packet parsing can cause a heap out-of-     bounds read       (bsc#1273922).
    - CVE-2026-68743: oversized length parameters in authentication requests can cause heap out-of-bounds     reads       (bsc#1273925).
    - CVE-2026-68744: unshrunk packet allocations during group resolution can allow uninitialized heap memory     disclosure       (bsc#1273924).
    - CVE-2026-90462: Fail-open in LDAP ppolicy access check allows continued authorization (bsc#1282584).
    - CVE-2026-90463: out-of-bounds read in the NSS service request parsers (bsc#1280360).
    - CVE-2026-90994: out-of-bounds read in PAM v1 parser (bsc#1280361).
    - CVE-2026-90995: NULL pointer dereference in PAM responder (bsc#1280362).
    - CVE-2026-90996: zero-length request body underflow in the NSS responder (bsc#1280363).
    - CVE-2026-92821: access control bypass due to premature LDAP access rule evaluation (bsc#1284326).
    - CVE-2026-104029: denial of service due to out-of-bounds read in autofs responder (bsc#1284314).
    - CVE-2026-104031: denial of service via memory exhaustion in autofs responder (bsc#1284316).
    - CVE-2026-104033: access control bypass due to improper LDAP shadow expiration check (bsc#1284318).
    - CVE-2026-104036: denial of service due to out-of-bounds write in NFS idmap plugin (bsc#1284321).
    - CVE-2026-104037: denial of service due to packet length underflow in autofs responder (bsc#1284322).
    - CVE-2026-104038: denial of service via missing SID extension in certificate mapping (bsc#1284323).
    - CVE-2026-104039: denial of service due to stale connection state reuse in PAM GSSAPI responder     (bsc#1284324).
    - CVE-2026-104043: Denial of Service via undersized packet parsing in NSS responder (bsc#1284266).
    - CVE-2026-104045: denial of service via race condition in autofs responder (bsc#1284470).

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 AlmaLinux 9.2 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare ALMALINUX9.2:CLSA-2026:1792405584 advisory.

  - A flaw was found in SSSD. A local user can trigger a Denial of Service (DoS) by exploiting a race     condition in the autofs responder between asynchronous enumeration completion and map invalidation. By     repeatedly sending concurrent map enumeration and invalidation requests, an attacker can cause memory to     leak, leading to excessive memory consumption that can disrupt or crash the autofs service.
    (CVE-2026-104045)

  - A flaw was found in SSSD. When configured with the LDAP access provider and `ldap_access_order` including     `ppolicy` or `lockout`, a fail-open condition in the LDAP ppolicy access check can occur if a user lookup     returns zero results. This can incorrectly return success and cache an allow decision, permitting     continued authorization for a deleted or deprovisioned user. A remote attacker with prior valid account     context could exploit this to maintain access to information and potentially make limited modifications to     resources that should no longer be available. (CVE-2026-90462)

  - A flaw was found in sssd. A local unprivileged user could send a specially crafted request with a zero-     length body to the Network Security Services (NSS) responder. This could lead to a denial-of-service     condition, causing the NSS responder to become unstable or terminate. This vulnerability affects the     availability of the system responder. (CVE-2026-90996)

Note that Nessus has not tested for these issues 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 multiple vulnerabilities as referenced in the TuxCare ALMALINUX9.6:CLSA-2026:1791809045 advisory.

  - A flaw was found in SSSD. When configured with the LDAP access provider and `ldap_access_order` including     `ppolicy` or `lockout`, a fail-open condition in the LDAP ppolicy access check can occur if a user lookup     returns zero results. This can incorrectly return success and cache an allow decision, permitting     continued authorization for a deleted or deprovisioned user. A remote attacker with prior valid account     context could exploit this to maintain access to information and potentially make limited modifications to     resources that should no longer be available. (CVE-2026-90462)

  - A flaw was found in sssd. A local unprivileged user could send a specially crafted request with a zero-     length body to the Network Security Services (NSS) responder. This could lead to a denial-of-service     condition, causing the NSS responder to become unstable or terminate. This vulnerability affects the     availability of the system responder. (CVE-2026-90996)

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

The AlmaLinux 9.6 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare ALMALINUX9.6:CLSA-2026:1791809045 advisory.

  - A flaw was found in SSSD. When configured with the LDAP access provider and `ldap_access_order` including     `ppolicy` or `lockout`, a fail-open condition in the LDAP ppolicy access check can occur if a user lookup     returns zero results. This can incorrectly return success and cache an allow decision, permitting     continued authorization for a deleted or deprovisioned user. A remote attacker with prior valid account     context could exploit this to maintain access to information and potentially make limited modifications to     resources that should no longer be available. (CVE-2026-90462)

  - A flaw was found in sssd. A local unprivileged user could send a specially crafted request with a zero-     length body to the Network Security Services (NSS) responder. This could lead to a denial-of-service     condition, causing the NSS responder to become unstable or terminate. This vulnerability affects the     availability of the system responder. (CVE-2026-90996)

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. When configured with the LDAP access provider and `ldap_access_order` including     `ppolicy` or `lockout`, a fail-open condition in the LDAP ppolicy access check can occur if a user lookup     returns zero results. This can incorrectly return success and cache an allow decision, permitting     continued authorization for a deleted or deprovisioned user. A remote attacker with prior valid account     context could exploit this to maintain access to information and potentially make limited modifications to     resources that should no longer be available. (CVE-2026-90462)

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

ID	Name	Product	Family	Type	Severity
376270	SUSE SLES15: libipa_hbac-devel / libipa_hbac0 / libsss_certmap-devel / etc (SUSE-SU-2026:5079-1)	Nessus	SuSE Local Security Checks	Local	high
367255	AlmaLinux 9.2 [TuxCare] Security Update: libipa_hbac / libipa_hbac-devel / libsss_autofs / libsss_certmap / etc Multiple Vulnerabilities (ALMALINUX9.2:CLSA-2026:1792405584)	Nessus	Alma Linux Local Security Checks	Local	medium
364712	Rocky Linux 9.6 [TuxCare] Security Update: libipa_hbac / libipa_hbac-devel / libsss_autofs / libsss_certmap / etc Multiple Vulnerabilities (ALMALINUX9.6:CLSA-2026:1791809045)	Nessus	Rocky Linux Local Security Checks	Local	medium
364707	AlmaLinux 9.6 [TuxCare] Security Update: libipa_hbac / libipa_hbac-devel / libsss_autofs / libsss_certmap / etc Multiple Vulnerabilities (ALMALINUX9.6:CLSA-2026:1791809045)	Nessus	Alma Linux Local Security Checks	Local	medium
349074	Linux Distros Unpatched Vulnerability : CVE-2026-90462	Nessus	Misc.	Local	medium

Detections

Analytics

CVE-2026-90462

medium

Tenable Plugins

high

medium

medium

medium

medium