CVE-2026-11837

A local privilege escalation vulnerability was found in the ansible.posix authorized_key module. The module's keyfile() function uses os.chown() instead of os.lchown() and opens files without O_NOFOLLOW when managing SSH authorized keys. An unprivileged local user can pre-stage symbolic links in their ~/.ssh directory to redirect file ownership changes to arbitrary system paths when an operator runs the authorized_key task as root, leading to local privilege escalation.

CVSS v3 7.3 HIGH

7.3^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.3 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://access.redhat.com/errata/RHSA-2026:42946
https://access.redhat.com/errata/RHSA-2026:79112
https://access.redhat.com/errata/RHSA-2026:80508
https://access.redhat.com/errata/RHSA-2026:82339
https://access.redhat.com/security/cve/CVE-2026-11837
https://bugzilla.redhat.com/show_bug.cgi?id=2487424
https://access.redhat.com/security/cve/CVE-2026-11837
https://bugzilla.redhat.com/show_bug.cgi?id=2487424
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-11837.json

Configurations

No configuration.

History

29 Oct 2026, 14:17

Type	Values Removed	Values Added
References		() https://access.redhat.com/errata/RHSA-2026:42946 -

13 Oct 2026, 21:17

Type	Values Removed	Values Added
References		() https://access.redhat.com/errata/RHSA-2026:82339 -

12 Oct 2026, 08:17

Type	Values Removed	Values Added
References		() https://access.redhat.com/errata/RHSA-2026:80508 -

08 Oct 2026, 22:17

Type	Values Removed	Values Added
References		() https://access.redhat.com/errata/RHSA-2026:79112 -

Information

Published : 2026-06-10 05:16

Updated : 2026-10-29 14:17

NVD link : CVE-2026-11837

Mitre link : CVE-2026-11837

CVE.ORG link : CVE-2026-11837

JSON object : View

Products Affected

No product.

CWE

CWE-59

Improper Link Resolution Before File Access ('Link Following')

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"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-11837.json", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "secalert@redhat.com", "description": [{"lang": "en", "value": "CWE-59"}]}, {"type": "Secondary", "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "description": [{"lang": "en", "value": "CWE-59"}]}], "descriptions": [{"lang": "en", "value": "A local privilege escalation vulnerability was found in the ansible.posix authorized_key module. The module's keyfile() function uses os.chown() instead of os.lchown() and opens files without O_NOFOLLOW when managing SSH authorized keys. An unprivileged local user can pre-stage symbolic links in their ~/.ssh directory to redirect file ownership changes to arbitrary system paths when an operator runs the authorized_key task as root, leading to local privilege escalation."}, {"lang": "es", "value": "Una vulnerabilidad de escalada de privilegios local fue encontrada en el m\u00f3dulo ansible.posix authorized_key. La funci\u00f3n keyfile() del m\u00f3dulo utiliza os.chown() en lugar de os.lchown() y abre archivos sin O_NOFOLLOW al gestionar claves SSH autorizadas. Un usuario local sin privilegios puede preconfigurar enlaces simb\u00f3licos en su directorio ~/.ssh para redirigir los cambios de propiedad de archivos a rutas de sistema arbitrarias cuando un operador ejecuta la tarea authorized_key como root, lo que lleva a una escalada de privilegios local."}], "lastModified": "2026-10-29T14:17:53.743", "sourceIdentifier": "secalert@redhat.com"}