Local privilege escalation via wrapped surface allocations
Published Aug 12, 2026 · Updated Aug 12, 2026
Integer overflow in Linux kernel vmwgfx allows local users to corrupt kernel memory through crafted surface-create ioctls. The handlers trust userspace array_size, mip_levels, and base_size values, letting 32-bit size calculations wrap and allocate undersized backing and dirty-tracking buffers. Access to a VMware guest render node is required; out-of-bounds reads and writes allow data disclosure, privilege escalation, or a guest-kernel crash.
Summary
What happened
Integer overflow in Linux kernel vmwgfx allows local users to corrupt kernel memory through crafted surface-create ioctls. The handlers trust userspace array_size, mip_levels, and base_size values, letting 32-bit size calculations wrap and allocate undersized backing and dirty-tracking buffers. Access to a VMware guest render node is required; out-of-bounds reads and writes allow data disclosure, privilege escalation, or a guest-kernel crash.
The record
- CVE
- CVE-2026-68446
- Published
- Aug 12, 2026
- Updated
- Aug 12, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 12, 2026CVE publishedPublication date reported by the CVE source.
- Aug 12, 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=504901dbb0b565fcbe466b0c56f3131586df5afd <5ff94e1279176b539d451e3e754fdcbd1a8d520a
- Affected versionversion=504901dbb0b565fcbe466b0c56f3131586df5afd <6910ccaf41678f7761ba2e57d72b77d056320b4d
- Affected versionversion=504901dbb0b565fcbe466b0c56f3131586df5afd <71779fe8bf403a9b3e28dc59229fa556db32d35d
- Affected versionversion=504901dbb0b565fcbe466b0c56f3131586df5afd <a4f55260f7f7d4dc4d0ee55063dfb0c457b77991
- Affected versionversion=504901dbb0b565fcbe466b0c56f3131586df5afd <b1379f0c42b88cb60b9f3757eb5d1e73ad460ed8
- Affected versionversion=5.7
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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