CVE-2026-12505
Cifs-utils: local privilege escalation via forged cifs.spnego key description in cifs.upcall
HIGH 7.8
At a glance
- Source
- NVD
- EPSS
- EPSS 0.16 % · percentile 5 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- redhat
- NVD status
- Awaiting Analysis
Description
A flaw was found in the cifs-utils package where the cifs.upcall helper fails to securely drop its root privileges before looking up user information inside a user-controlled environment. A local, low privileged attacker can exploit this by using a crafted request_key payload to trick the root-owned helper into entering a custom environment (namespace) containing a malicious NSS module. This forces the system to load the attacker's controlled NSS Module and configuration, allowing them to execute arbitrary commands as the root user, elevating their privileges and fully compromising the system.
Weaknesses (CWE)
- CWE-250 — Execution with Unnecessary Privileges
References
- https://access.redhat.com/errata/RHSA-2026:32990
- https://access.redhat.com/errata/RHSA-2026:39575
- https://access.redhat.com/errata/RHSA-2026:39576
- https://access.redhat.com/errata/RHSA-2026:44232
- https://access.redhat.com/security/cve/CVE-2026-12505
- https://bugzilla.redhat.com/show_bug.cgi?id=2489805
- https://git.samba.org/?p=cifs-utils.git;a=commit;h=972c5b5ff95e3e812bc8daa72d0383654ab0dba7
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12505.json
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | redhat |
| CVSS 3.1 | HIGH 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | redhat-SADP |
| CVSS 3.1 | HIGH 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | NVD · secalert@redhat.com (Secondary) |
| CVSS 3.1 | HIGH 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | NVD · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c (Secondary) |
European references
- ENISA EUVD · EUVD-2026-37834
- GCVE · GCVE-0-2026-12505
CERT-FR advisories
- CERTFR-2026-AVI-1094 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0955 — Multiples vulnérabilités dans le noyau Linux de Red Hat · cert.ssi.gouv.fr
Affected products
| Product | Versions |
|---|---|
| Red Hat · Red Hat Enterprise Linux 10 | unaffected 0:7.6-1.el10_2 < * |
| Red Hat · Red Hat Enterprise Linux 8 | unaffected 0:7.0-5.el8_10 < * |
| Red Hat · Red Hat Enterprise Linux 9 | unaffected 0:7.6-2.el9_8 < * |
| Red Hat · Red Hat Enterprise Linux 9 | unaffected 0:7.6-2.el9_8 < * |
| Red Hat · Red Hat OpenShift Container Platform 4.22 | unaffected 4.22.9.8.202607220526-0 < * |
| Red Hat · Red Hat Enterprise Linux 6 | |
| Red Hat · Red Hat Enterprise Linux 7 | |
| Red Hat · Red Hat OpenShift Container Platform 4 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |