OESA-2026-4285 (CVE-2026-90994)

Vulnerability from osv_openeuler – Published: 2026-10-16 11:58 – Updated: 2026-10-16 11:58 – Source website
VLAI
Summary
sssd security update
Details

Provides a set of daemons to manage access to remote directories and authentication mechanisms. It provides an NSS and PAM interface toward the system and a pluggable back end system to connect to multiple different account sources. It is also the basis to provide client auditing and policy services for projects like FreeIPA.

Security Fix(es):

A flaw was found in sssd, specifically within the PAM (Pluggable Authentication Modules) responder's protocol v1 parser, pam_parse_in_data(). A local client with access to the PAM responder's UNIX socket can exploit this by negotiating protocol v1 and sending an empty or truncated PAM request body. This can trigger an out-of-bounds read, potentially causing the PAM responder to terminate or restart, leading to a local denial of service.(CVE-2026-90994)

A flaw was found in SSSD (System Security Services Daemon). A local attacker with privileges to connect to the PAM (Pluggable Authentication Modules) responder socket can send a specially crafted protocol request. If the pam_app_services configuration is enabled and the service item is omitted from the request, a NULL pointer dereference can occur. This vulnerability leads to a denial of service, causing the PAM responder to crash and disrupt authentication services.(CVE-2026-90995)

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)

Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "libipa_hbac-2.9.4-27.oe2403sp1.aarch64.rpm",
          "libipa_hbac-devel-2.9.4-27.oe2403sp1.aarch64.rpm",
          "libsss_autofs-2.9.4-27.oe2403sp1.aarch64.rpm",
          "libsss_certmap-2.9.4-27.oe2403sp1.aarch64.rpm",
          "libsss_certmap-devel-2.9.4-27.oe2403sp1.aarch64.rpm",
          "libsss_idmap-2.9.4-27.oe2403sp1.aarch64.rpm",
          "libsss_idmap-devel-2.9.4-27.oe2403sp1.aarch64.rpm",
          "libsss_nss_idmap-2.9.4-27.oe2403sp1.aarch64.rpm",
          "libsss_nss_idmap-devel-2.9.4-27.oe2403sp1.aarch64.rpm",
          "libsss_sudo-2.9.4-27.oe2403sp1.aarch64.rpm",
          "python3-libipa_hbac-2.9.4-27.oe2403sp1.aarch64.rpm",
          "python3-libsss_nss_idmap-2.9.4-27.oe2403sp1.aarch64.rpm",
          "python3-sss-2.9.4-27.oe2403sp1.aarch64.rpm",
          "python3-sss-murmur-2.9.4-27.oe2403sp1.aarch64.rpm",
          "sssd-2.9.4-27.oe2403sp1.aarch64.rpm",
          "sssd-ad-2.9.4-27.oe2403sp1.aarch64.rpm",
          "sssd-client-2.9.4-27.oe2403sp1.aarch64.rpm",
          "sssd-common-2.9.4-27.oe2403sp1.aarch64.rpm",
          "sssd-common-pac-2.9.4-27.oe2403sp1.aarch64.rpm",
          "sssd-dbus-2.9.4-27.oe2403sp1.aarch64.rpm",
          "sssd-debuginfo-2.9.4-27.oe2403sp1.aarch64.rpm",
          "sssd-debugsource-2.9.4-27.oe2403sp1.aarch64.rpm",
          "sssd-idp-2.9.4-27.oe2403sp1.aarch64.rpm",
          "sssd-ipa-2.9.4-27.oe2403sp1.aarch64.rpm",
          "sssd-kcm-2.9.4-27.oe2403sp1.aarch64.rpm",
          "sssd-krb5-2.9.4-27.oe2403sp1.aarch64.rpm",
          "sssd-krb5-common-2.9.4-27.oe2403sp1.aarch64.rpm",
          "sssd-ldap-2.9.4-27.oe2403sp1.aarch64.rpm",
          "sssd-nfs-idmap-2.9.4-27.oe2403sp1.aarch64.rpm",
          "sssd-proxy-2.9.4-27.oe2403sp1.aarch64.rpm",
          "sssd-tools-2.9.4-27.oe2403sp1.aarch64.rpm",
          "sssd-winbind-idmap-2.9.4-27.oe2403sp1.aarch64.rpm"
        ],
        "noarch": [
          "python3-sssdconfig-2.9.4-27.oe2403sp1.noarch.rpm",
          "sssd-help-2.9.4-27.oe2403sp1.noarch.rpm"
        ],
        "src": [
          "sssd-2.9.4-27.oe2403sp1.src.rpm"
        ],
        "x86_64": [
          "libipa_hbac-2.9.4-27.oe2403sp1.x86_64.rpm",
          "libipa_hbac-devel-2.9.4-27.oe2403sp1.x86_64.rpm",
          "libsss_autofs-2.9.4-27.oe2403sp1.x86_64.rpm",
          "libsss_certmap-2.9.4-27.oe2403sp1.x86_64.rpm",
          "libsss_certmap-devel-2.9.4-27.oe2403sp1.x86_64.rpm",
          "libsss_idmap-2.9.4-27.oe2403sp1.x86_64.rpm",
          "libsss_idmap-devel-2.9.4-27.oe2403sp1.x86_64.rpm",
          "libsss_nss_idmap-2.9.4-27.oe2403sp1.x86_64.rpm",
          "libsss_nss_idmap-devel-2.9.4-27.oe2403sp1.x86_64.rpm",
          "libsss_sudo-2.9.4-27.oe2403sp1.x86_64.rpm",
          "python3-libipa_hbac-2.9.4-27.oe2403sp1.x86_64.rpm",
          "python3-libsss_nss_idmap-2.9.4-27.oe2403sp1.x86_64.rpm",
          "python3-sss-2.9.4-27.oe2403sp1.x86_64.rpm",
          "python3-sss-murmur-2.9.4-27.oe2403sp1.x86_64.rpm",
          "sssd-2.9.4-27.oe2403sp1.x86_64.rpm",
          "sssd-ad-2.9.4-27.oe2403sp1.x86_64.rpm",
          "sssd-client-2.9.4-27.oe2403sp1.x86_64.rpm",
          "sssd-common-2.9.4-27.oe2403sp1.x86_64.rpm",
          "sssd-common-pac-2.9.4-27.oe2403sp1.x86_64.rpm",
          "sssd-dbus-2.9.4-27.oe2403sp1.x86_64.rpm",
          "sssd-debuginfo-2.9.4-27.oe2403sp1.x86_64.rpm",
          "sssd-debugsource-2.9.4-27.oe2403sp1.x86_64.rpm",
          "sssd-idp-2.9.4-27.oe2403sp1.x86_64.rpm",
          "sssd-ipa-2.9.4-27.oe2403sp1.x86_64.rpm",
          "sssd-kcm-2.9.4-27.oe2403sp1.x86_64.rpm",
          "sssd-krb5-2.9.4-27.oe2403sp1.x86_64.rpm",
          "sssd-krb5-common-2.9.4-27.oe2403sp1.x86_64.rpm",
          "sssd-ldap-2.9.4-27.oe2403sp1.x86_64.rpm",
          "sssd-nfs-idmap-2.9.4-27.oe2403sp1.x86_64.rpm",
          "sssd-proxy-2.9.4-27.oe2403sp1.x86_64.rpm",
          "sssd-tools-2.9.4-27.oe2403sp1.x86_64.rpm",
          "sssd-winbind-idmap-2.9.4-27.oe2403sp1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP1",
        "name": "sssd",
        "purl": "pkg:rpm/openEuler/sssd\u0026distro=openEuler-24.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.9.4-27.oe2403sp1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Medium"
  },
  "details": "Provides a set of daemons to manage access to remote directories and authentication mechanisms. It provides an NSS and PAM interface toward the system and a pluggable back end system to connect to multiple different account sources. It is also the basis to provide client auditing and policy services for projects like FreeIPA.\r\n\r\nSecurity Fix(es):\n\nA flaw was found in sssd, specifically within the PAM (Pluggable Authentication Modules) responder\u0026apos;s protocol v1 parser, pam_parse_in_data(). A local client with access to the PAM responder\u0026apos;s UNIX socket can exploit this by negotiating protocol v1 and sending an empty or truncated PAM request body. This can trigger an out-of-bounds read, potentially causing the PAM responder to terminate or restart, leading to a local denial of service.(CVE-2026-90994)\n\nA flaw was found in SSSD (System Security Services Daemon). A local attacker with privileges to connect to the PAM (Pluggable Authentication Modules) responder socket can send a specially crafted protocol request. If the `pam_app_services` configuration is enabled and the service item is omitted from the request, a NULL pointer dereference can occur. This vulnerability leads to a denial of service, causing the PAM responder to crash and disrupt authentication services.(CVE-2026-90995)\n\nA 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)",
  "id": "OESA-2026-4285",
  "modified": "2026-10-16T11:58:57Z",
  "published": "2026-10-16T11:58:57Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4285"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90994"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90995"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90996"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "sssd security update",
  "upstream": [
    "CVE-2026-90994",
    "CVE-2026-90995",
    "CVE-2026-90996"
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON

Loading timeline…




    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.