MSRC_CVE-2026-26148

Vulnerability from csaf_microsoft - Published: 2026-03-10 07:00 - Updated: 2026-03-11 07:00
Summary
Microsoft Azure AD SSH Login extension for Linux Elevation of Privilege Vulnerability

Notes

Additional Resources
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
Disclaimer
The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.
Customer Action
Required. The vulnerability documented by this CVE requires customer action to resolve.
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{
  "document": {
    "acknowledgments": [
      {
        "names": [
          "\u003ca href=\"https://x.com/sagitz_\"\u003eSagi Tzadik\u003c/a\u003e with \u003ca href=\"https://www.wiz.io/\"\u003eWiz\u003c/a\u003e"
        ]
      }
    ],
    "aggregate_severity": {
      "namespace": "https://www.microsoft.com/en-us/msrc/security-update-severity-rating-system",
      "text": "Important"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      },
      {
        "category": "general",
        "text": "Required. The vulnerability documented by this CVE requires customer action to resolve.",
        "title": "Customer Action"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2026-26148 Microsoft Azure AD SSH Login extension for Linux Elevation of Privilege Vulnerability - HTML",
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26148"
      },
      {
        "category": "self",
        "summary": "CVE-2026-26148 Microsoft Azure AD SSH Login extension for Linux Elevation of Privilege Vulnerability - CSAF",
        "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-26148.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Exploitability Index",
        "url": "https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "Microsoft Azure AD SSH Login extension for Linux Elevation of Privilege Vulnerability",
    "tracking": {
      "current_release_date": "2026-03-11T07:00:00.000Z",
      "generator": {
        "date": "2026-03-11T21:06:18.275Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-26148",
      "initial_release_date": "2026-03-10T07:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-03-10T07:00:00.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        },
        {
          "date": "2026-03-11T07:00:00.000Z",
          "legacy_version": "1.1",
          "number": "2",
          "summary": "Acknowledgement Updated"
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c1.0.033370002",
            "product": {
              "name": "Microsoft Azure AD SSH Login extension for Linux \u003c1.0.033370002",
              "product_id": "1"
            }
          },
          {
            "category": "product_version",
            "name": "1.0.033370002",
            "product": {
              "name": "Microsoft Azure AD SSH Login extension for Linux 1.0.033370002",
              "product_id": "21024"
            }
          }
        ],
        "category": "product_name",
        "name": "Microsoft Azure AD SSH Login extension for Linux"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-26148",
      "cwe": {
        "id": "CWE-454",
        "name": "External Initialization of Trusted Variables or Data Stores"
      },
      "notes": [
        {
          "category": "general",
          "text": "Microsoft",
          "title": "Assigning CNA"
        },
        {
          "category": "faq",
          "text": "Successful exploitation of this vulnerability requires an attacker to prepare the target environment to improve exploit reliability.",
          "title": "According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?"
        },
        {
          "category": "faq",
          "text": "An unprivileged local user on an affected Azure Linux VM can obtain root privileges.",
          "title": "How could an attacker exploit this vulnerability?"
        },
        {
          "category": "faq",
          "text": "Customers update the Azure AD SSH Login extension by using their Linux distribution\u2019s package manager to install the latest version of the aadsshlogin package. Systems with the extension already installed have packages.microsoft.com configured automatically, so no additional setup is required. Depending on the Linux distribution, customers should run one of the following commands:\nUbuntu or Debian: sudo apt update aadsshlogin, RHEL-based distributions (RHEL, CentOS, Rocky Linux, AlmaLinux, Oracle Linux): sudo dnf update aadsshlogin, SUSE-based distributions (SLES, openSUSE): sudo zypper update aadsshlogin",
          "title": "How can customers update the Microsoft Azure AD SSH Login extension for Linux?"
        }
      ],
      "product_status": {
        "fixed": [
          "21024"
        ],
        "known_affected": [
          "1"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-26148 Microsoft Azure AD SSH Login extension for Linux Elevation of Privilege Vulnerability - HTML",
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26148"
        },
        {
          "category": "self",
          "summary": "CVE-2026-26148 Microsoft Azure AD SSH Login extension for Linux Elevation of Privilege Vulnerability - CSAF",
          "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-26148.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-03-10T07:00:00.000Z",
          "details": "1.0.033370002:Security Update:https://packages.microsoft.com/",
          "product_ids": [
            "1"
          ],
          "url": "https://packages.microsoft.com/"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "environmentalsScore": 0.0,
            "exploitCodeMaturity": "PROOF_OF_CONCEPT",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "remediationLevel": "OFFICIAL_FIX",
            "reportConfidence": "CONFIRMED",
            "scope": "CHANGED",
            "temporalScore": 7.3,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
            "1"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Elevation of Privilege"
        },
        {
          "category": "exploit_status",
          "details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Unlikely"
        }
      ],
      "title": "Microsoft Azure AD SSH Login extension for Linux Elevation of Privilege Vulnerability"
    }
  ]
}


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Sightings

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  • 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.



Detection rules are retrieved from Rulezet.