Improper Handling of Insufficient Permissions or Privileges Affecting samba package, versions [,4.24.3)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published28 May 2026
- disclosed27 May 2026
- creditPavel Kohout
Introduced: 27 May 2026
CVE-2026-2340 (opens in a new tab)How to fix?
Upgrade samba to version 4.24.3 or higher.
Overview
Affected versions of this package are vulnerable to Improper Handling of Insufficient Permissions or Privileges due to insufficient validation during rename operations in the vfs_worm process. An attacker can overwrite protected files by renaming a newly created file over an existing protected file.
Workaround
This vulnerability can be mitigated by setting read-only permissions on protected files at the underlying filesystem level or by configuring worm:grace_period = 0 in smb.conf to eliminate the writable grace period.