GPU job interruption via wrong CCCB space check
Published Aug 12, 2026 · Updated Aug 12, 2026
Command-buffer validation in Linux allows local users to interrupt PowerVR GPU jobs through paired geometry and fragment submissions. pvr_queue_prepare_job checks space in the geometry CCCB rather than the paired fragment job's CCCB, allowing run_job to proceed and return before writing the full fragment command sequence. Reachability requires an Imagination PowerVR GPU and local submission of paired jobs; the bounded result is kernel warnings and GPU job timeouts.
Summary
What happened
Command-buffer validation in Linux allows local users to interrupt PowerVR GPU jobs through paired geometry and fragment submissions. pvr_queue_prepare_job checks space in the geometry CCCB rather than the paired fragment job's CCCB, allowing run_job to proceed and return before writing the full fragment command sequence. Reachability requires an Imagination PowerVR GPU and local submission of paired jobs; the bounded result is kernel warnings and GPU job timeouts.
The record
- CVE
- CVE-2026-68437
- Published
- Aug 12, 2026
- Updated
- Aug 12, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-1285, T1499
- 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
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- Affected versionversion=6.8
- Affected versionversion=eaf01ee5ba28b97f96a3d3eec4c5fbfb37ee4cde <15a9863929206911a08b6f62de9c5da6931dbc9e
- Affected versionversion=eaf01ee5ba28b97f96a3d3eec4c5fbfb37ee4cde <4baf9e70cb756d78dd56419f8baee2978a72d0c3
- Affected versionversion=eaf01ee5ba28b97f96a3d3eec4c5fbfb37ee4cde <4ddf82c18ee4b3d14ec7fa002c4039b46c961abc
- Affected versionversion=eaf01ee5ba28b97f96a3d3eec4c5fbfb37ee4cde <e2c29d51c0f65459ae5bbf7ccc302df4c359c473
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Attacks
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