Kernel-memory disclosure and crash via unchecked IB indexing
Published May 28, 2026 · Updated May 28, 2026
Out-of-bounds reads in the AMDGPU VCN4 IB parser allow local users to disclose kernel memory or crash Linux Kernel systems. The parser directly indexes attacker-controlled IB contents for decode-buffer fields and loop words without confirming that idx+6 through idx+8 remain within the buffer object. Access to a DRM render node and DRM_IOCTL_AMDGPU_CS is required; the flaw performs no out-of-bounds write, but crossing an unmapped page produces a kernel oops.
Summary
What happened
Out-of-bounds reads in the AMDGPU VCN4 IB parser allow local users to disclose kernel memory or crash Linux Kernel systems. The parser directly indexes attacker-controlled IB contents for decode-buffer fields and loop words without confirming that idx+6 through idx+8 remain within the buffer object. Access to a DRM render node and DRM_IOCTL_AMDGPU_CS is required; the flaw performs no out-of-bounds write, but crossing an unmapped page produces a kernel oops.
The record
- CVE
- CVE-2026-46204
- Published
- May 28, 2026
- Updated
- May 28, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-125, T1499.004
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- May 28, 2026CVE publishedPublication date reported by the CVE source.
- May 28, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <6.12.90
- Affected versionversion=0 <6.18.32
- Affected versionversion=0 <6.6.140
- Affected versionversion=0 <7.0.9
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1dc005775fb5b3f86464406452b17364f85581d3
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2444eb0ec8283f4a3845eb7febad378476e1ba3c
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5c3e8ebad0c9e2354ddfa8f2148dc4f70a3b4bd1
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a6d5563ba1f03a049561cd347574613167294e8d
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d0802a8877d730260d4af4dd4e0b6cde7e0e593f
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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Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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