Local memory disclosure via unchecked XFIXES request length
Published Jun 17, 2025 · Updated Jun 30, 2026
Information disclosure in X.Org Xwayland before 24.1.7 allows local users to read prior X client request memory through XFIXES. The XFixesSetClientDisconnectMode handler accepts an undersized request without validating its protocol length, then reads bytes left by an earlier request. Access to an authorized X client connection is required; exposed data belongs to the server process, and no memory write is reported.
Summary
What happened
Information disclosure in X.Org Xwayland before 24.1.7 allows local users to read prior X client request memory through XFIXES. The XFixesSetClientDisconnectMode handler accepts an undersized request without validating its protocol length, then reads bytes left by an earlier request. Access to an authorized X client connection is required; exposed data belongs to the server process, and no memory write is reported.
The record
- CVE
- CVE-2025-49177
- Published
- Jun 17, 2025
- Updated
- Jun 30, 2026
- Vendor
- 389 Directory Server
- Product
- Red Hat Enterprise Linux 6
- Classifications
- CWE-200, T1005
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 17, 2025CVE publishedPublication date reported by the CVE source.
- Jun 30, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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