Vulnerability · Published Aug 4, 2026 · Assigned by redhat
CVE-2026-68743Sssd: sssd: pam responder out-of-bounds read via unchecked auth_token_length in protocol v1
Medium 5.5
In plain English
A medium-severity out-of-bounds read in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | sssd | no fix listed | DEBIAN-CVE-2026-68743 |
| Debian:13 | sssd | no fix listed | DEBIAN-CVE-2026-68743 |
| Ubuntu:22.04:LTS | sssd | 2.6.3-1ubuntu3.9 | UBUNTU-CVE-2026-68743 |
| Ubuntu:22.04:LTS | sssd | 2.6.3-1ubuntu3.9 | USN-8718-1 |
| Ubuntu:24.04:LTS | sssd | 2.9.4-1.1ubuntu6.8 | USN-8718-1 |
| Ubuntu:24.04:LTS | sssd | 2.9.4-1.1ubuntu6.8 | UBUNTU-CVE-2026-68743 |
| Ubuntu:26.04:LTS | sssd | 2.12.0-1ubuntu5.4 | USN-8718-1 |
| Ubuntu:26.04:LTS | sssd | 2.12.0-1ubuntu5.4 | UBUNTU-CVE-2026-68743 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 6 | see references |
| Red Hat | Red Hat Enterprise Linux 7 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
| Red Hat | Red Hat OpenShift Container Platform 4 | see references |
| Red Hat | Red Hat OpenShift Container Platform 4 | see references |
| Red Hat | Red Hat OpenShift Container Platform 5 | see references |
Weakness: CWE-125 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
References
- https://access.redhat.com/security/cve/CVE-2026-68743 vdb-entry, x_refsource_REDHAT
- RHBZ#2509760 issue-tracking, x_refsource_REDHAT