Bug 2442757 (CVE-2026-25953)

Summary: CVE-2026-25953 freerdp: FreeRDP: Denial of Service due to use-after-free vulnerability in window 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. This use-after-free vulnerability occurs in the `xf_AppUpdateWindowFromSurface` function where a bare pointer to a window is obtained without proper lifetime protection. A remote attacker could exploit this by concurrently deleting the window while it is being accessed, leading to a read from freed memory. This could result in a denial of service (DoS) for the affected system.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2442822, 2442827, 2442848, 2442824, 2442841    
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Description OSIDB Bzimport 2026-02-25 21:04:04 UTC 
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.23.0, `xf_AppUpdateWindowFromSurface` reads from a freed `xfAppWindow` because the RDPGFX DVC thread obtains a bare pointer via `xf_rail_get_window` without any lifetime protection, while the main thread can concurrently delete the window through a fastpath window-delete order. Version 3.23.0 fixes the issue.