We use optional cookies to improve your experience on our websites, such as through social media connections, and to display personalized advertising based on your online activity. If you reject optional cookies, only cookies necessary to provide you the services will be used. You may change your selection by clicking “Manage Cookies” at the bottom of the page. Privacy Statement Third-Party Cookies Accept Reject Manage cookies MSRC  Customer Guidance  Security Update Guide  Vulnerabilities  CVE-2026-4878 Libcap: libcap: privilege escalation via toctou race condition in cap_set_file() NewRecently updated On this page  CVE-2026-4878  Subscribe RSS PowerShell  API  CSAF Security Vulnerability Released: Apr 11, 2026 Last updated: Apr 14, 2026 Assigning CNA redhat CVE.org link CVE-2026-4878  Weakness CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition CVSS Source redhat Vector String CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H Metrics CVSS:3.1 6.7 / 6.7  Base score metrics: 6.7 / Temporal score metrics: 6.7  Expand all  Collapse all Metric Value   Base score metrics(8) Attack Vector Local Attack Complexity High Privileges Required Low User Interaction Required Scope Unchanged Confidentiality High Integrity High Availability High Please see Common Vulnerability Scoring System for more information on the definition of these metrics. Acknowledgements Microsoft recognizes the efforts of those in the security community who help us protect customers through coordinated vulnerability disclosure. See Acknowledgements for more information. Security Updates To determine the support lifecycle for your software, see the Microsoft Support Lifecycle. Release date Descending  Edit columns  Download  Filters  Product Family  Max Severity  Impact  Platform   Clear Release date  Product Platform Impact Max Severity Article Download Build Number Assigning CNA Customer Action Required Loading... 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. Revisions version revisionDate description 3.0 Apr 14, 2026 Information published. 2.0 Apr 13, 2026 Information published. 1.0 Apr 11, 2026 Information published.  How satisfied are you with the MSRC Security Update Guide? Rating  Broken  Bad  Below average  Average  Great!  Your Privacy Choices Consumer Health Privacy