Vulnerability-Lookup

UBUNTU-CVE-2026-11837 (CVE-2026-11837)

Vulnerability from osv_ubuntu – Published: 2026-06-10 05:16 – Updated: 2026-06-10 05:16 – Source website

Details

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.

Severity

7.3 (High)


                    
                      CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-11837	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-11837	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2487424	REPORT
	https://access.redhat.com/security/cve/CVE-2026-11837	REPORT

JSON

To clipboard

{
  "affected": [
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          {
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  ],
  "aliases": [],
  "details": "A local privilege escalation vulnerability was found in the ansible.posix authorized_key module. The module\u0027s 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.",
  "id": "UBUNTU-CVE-2026-11837",
  "modified": "2026-06-10T05:16:00Z",
  "published": "2026-06-10T05:16:00Z",
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  "related": [],
  "schema_version": "1.7.0",
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}

CVE-2026-11837 (GCVE-0-2026-11837)

Vulnerability from cvelistv5 – Published: 2026-06-10 05:03 – Updated: 2026-09-09 12:04

Title

Ansible-collection-ansible-posix: ansible.posix authorized_key: local privilege escalation via symlink-following chown

Summary

Severity

7.3 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-10 13:57 UTC

CWE

CWE-59 - Improper Link Resolution Before File Access ('Link Following')

Assigner

redhat redhat root

References

3 references

URL	Tags
https://access.redhat.com/security/cve/CVE-2026-11837	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2487424	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex

Impacted products

5 products

Vendor	Product	Version
Red Hat	Red Hat Enterprise Linux 10	cpe:/o:redhat:enterprise_linux:10
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9
Red Hat	Red Hat OpenStack Platform 17.1	cpe:/a:redhat:openstack:17.1
Red Hat	Red Hat OpenStack Platform 18.0	cpe:/a:redhat:openstack:18.0

Date Public

2026-06-10 00:00

Credits

Red Hat would like to thank Valentino Paulon for reporting this issue.

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

UBUNTU-CVE-2026-11837 (CVE-2026-11837)

CVE-2026-11837 (GCVE-0-2026-11837)

Tags

Sightings

Nomenclature

Related by attack behaviour