Bug 2442767 (CVE-2026-25959)

Summary: CVE-2026-25959 freerdp: FreeRDP: Denial of Service via heap use-after-free in clipboard handling
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in FreeRDP, a free implementation of the Remote Desktop Protocol. A remote attacker could exploit a race condition in the clipboard handling feature. This vulnerability, known as a heap use-after-free, occurs when the system attempts to use memory that has already been released. Successful exploitation could lead to a denial of service, making the system unavailable.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2442809, 2442813, 2442818, 2442838, 2442825    
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Description OSIDB Bzimport 2026-02-25 21:05:26 UTC 
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.23.0, `xf_cliprdr_provide_data_` passes freed `pDstData` to `XChangeProperty` because the cliprdr channel thread calls `xf_cliprdr_server_format_data_response` which converts and uses the clipboard data without holding any lock, while the X11 event thread concurrently calls `xf_cliprdr_clear_cached_data` → `HashTable_Clear` which frees the same data via `xf_cached_data_free`, triggering a heap use after free. Version 3.23.0 fixes the issue.