CVE-2026-68743
Publication date 4 August 2026
Last updated 4 September 2026
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| sssd | 26.04 LTS resolute |
Fixed 2.12.0-1ubuntu5.4
|
| 24.04 LTS noble |
Fixed 2.9.4-1.1ubuntu6.8
|
|
| 22.04 LTS jammy |
Fixed 2.6.3-1ubuntu3.9
|
|
| 20.04 LTS focal |
Fixed 2.2.3-3ubuntu0.13+esm1
|
|
| 18.04 LTS bionic |
Fixed 1.16.1-1ubuntu1.8+esm1
|
|
| 16.04 LTS xenial |
Fixed 1.13.4-1ubuntu1.15+esm1
|
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CVSS version: CVSS v3.0
Base score
5.5 · Medium
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
References
Related Ubuntu Security Notices (USN)
- USN-8718-1
- SSSD vulnerability
- 3 September 2026