Compiler crash via TreeRemove out-of-bounds write
Published Jun 26, 2026 · Updated Jun 26, 2026
Out-of-bounds write in Graphics DDK's libusc allows attackers to crash GPU shader compilation via crafted WebGPU shader input. TreeRemove computes an out-of-range pointer offset from an edge-case small shader value, writes beyond the intended buffer, and faults the compiler process. The documented result is a segmentation-fault crash; the vendor does not specify the additional exploitation possible when the compiler has system privileges.
Summary
What happened
Out-of-bounds write in Graphics DDK's libusc allows attackers to crash GPU shader compilation via crafted WebGPU shader input. TreeRemove computes an out-of-range pointer offset from an edge-case small shader value, writes beyond the intended buffer, and faults the compiler process. The documented result is a segmentation-fault crash; the vendor does not specify the additional exploitation possible when the compiler has system privileges.
The record
- CVE
- CVE-2026-21734
- Published
- Jun 26, 2026
- Updated
- Jun 26, 2026
- Vendor
- Imagination Technologies
- Product
- Graphics DDK
- Classifications
- CWE-823, CAPEC-113, T1203
- Attack vector
- Unavailable
- Privileges
- Unavailable
Timeline
How it unfolded
- Jun 26, 2026CVE publishedPublication date reported by the CVE source.
- Jun 26, 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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- Affected versionversion=1.18 RTM
- Affected versionversion=23.2 RTM
- Affected versionversion=24.1 RTM <=24.2 RTM
- Affected versionversion=25.1 RTM <=25.3 RTM
What conditions does exploitation require?
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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