Sensitive information disclosure via integer-overflowed request length
Published Dec 13, 2023 · Updated Jun 23, 2026
Information disclosure in Red Hat xorg-server before 21.1.10 allows remote authenticated users to read sensitive memory via crafted RRChangeProviderProperty or RRChangeOutputProperty requests. The request-length calculation clips nUnits to 32 bits, allowing REQUEST_FIXED_SIZE validation to pass before an out-of-bounds read. The attack requires access to the X server protocol; the documented impact is memory disclosure without demonstrated integrity or availability compromise.
Summary
What happened
Information disclosure in Red Hat xorg-server before 21.1.10 allows remote authenticated users to read sensitive memory via crafted RRChangeProviderProperty or RRChangeOutputProperty requests. The request-length calculation clips nUnits to 32 bits, allowing REQUEST_FIXED_SIZE validation to pass before an out-of-bounds read. The attack requires access to the X server protocol; the documented impact is memory disclosure without demonstrated integrity or availability compromise.
The record
- CVE
- CVE-2023-6478
- Published
- Dec 13, 2023
- Updated
- Jun 23, 2026
- Vendor
- Red Hat
- Product
- Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
- Classifications
- CWE-190, CWE-125, T1203
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Dec 13, 2023CVE publishedPublication date reported by the CVE source.
- Jun 23, 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?
Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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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