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Fencer Intel
medium 5.5

CVE-2026-68743 json

Sssd: sssd: pam responder out-of-bounds read via unchecked auth_token_length in protocol v1

published 3mo ago modified 6d ago also EUVD-2026-52865

cvss
5.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 2%
public exploits
0
none known

Summary

A flaw was found in SSSD. The extract_authtok_v1() function in the PAM responder does not validate the auth_token_length field against the remaining buffer size before processing. A local attacker can exploit this via a crafted protocol v1 request to the PAM responder socket, causing an out-of-bounds read and process crash, resulting in a denial of service.

Patch / fix

  • sssd Debian 14 2.13.1-2

debian advisories DEBIAN-CVE-2026-68743

  • sssd Ubuntu 22.04 LTS 2.6.3-1ubuntu3.9
  • sssd Ubuntu 24.04 LTS 2.9.4-1.1ubuntu6.8
  • sssd Ubuntu 26.04 LTS 2.12.0-1ubuntu5.4
  • sssd Ubuntu Pro 16.04 LTS 1.13.4-1ubuntu1.15+esm1
  • sssd Ubuntu Pro 18.04 LTS 1.16.1-1ubuntu1.8+esm1
  • sssd Ubuntu Pro 20.04 LTS 2.2.3-3ubuntu0.13+esm1

ubuntu advisories UBUNTU-CVE-2026-68743

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • sssd SLE Micro 5.5 2.5.2-150500.10.49.1
  • sssd SLE Micro 5.4, SLE Micro 5.3 2.5.2-150400.4.51.1
  • sssd SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 2.10.2-160000.5.1
  • sssd SLE Module for Basesystem 15 SP7 2.10.2-150700.9.40.1
  • sssd Linux Micro 6.1 2.9.5-slfo.1.1_7.1
  • sssd Linux Micro 6.0 2.8.2-10.1
  • sssd SLES for SAP 15 SP6, SLES 15 SP6-LTSS 2.10.2-150600.3.58.1
  • sssd SLES LTSS Extended Security 12 SP5 1.16.1-7.79.1

suse advisories SUSE-SU-2026:5079-1SUSE-SU-2026:4456-1SUSE-SU-2026:4027-1SUSE-SU-2026:23465-1SUSE-SU-2026:23613-1SUSE-SU-2026:3899-1

  • sssd openSUSE Leap 16.0 2.10.2-160000.5.1

opensuse advisories openSUSE-SU-2026:21748-1

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-68743 updated cvss 5.5

sssd: sssd: PAM responder out-of-bounds read via unchecked auth_token_length in protocol v1

  • Red Hat Enterprise Linux 6 sssd, sssd-ad, sssd-ipa, sssd-dbus, sssd-krb5, sssd-ldap, +19 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 sssd, sssd-ad, sssd-ipa, sssd-kcm, sssd-dbus, sssd-krb5, +24 more Red Hat Enterprise Linux 8 sssd, sssd-ad, sssd-idp, sssd-ipa, sssd-kcm, sssd-dbus, +24 more Red Hat Enterprise Linux 9 sssd, sssd-ad, sssd-idp, sssd-ipa, sssd-kcm, sssd-dbus, +24 more Red Hat Enterprise Linux 10 sssd Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9 Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
3mo ago

Exploit prediction

0.13% chance of exploitation in the next 30 days, higher than 2% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat OpenShift Container Platform 4
  • Red Hat Red Hat OpenShift Container Platform 5

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.