Kernel crash via unbounded NVMe PRP list
Published Sep 16, 2026 · Updated Sep 16, 2026
Out-of-bounds write in the Linux 6.17 megaraid_sas driver allows local users to crash the kernel through large NVMe I/O requests. The megasas_make_prp_nvme() loop writes PRP entries into cmd->sg_frame without checking instance->max_chain_frame_sz, so a 4 MiB transfer can overrun the DMA-pool buffer by one page. Reachability requires an NVMe device behind a MegaRAID controller whose firmware reports a large MDTS; a mapped following page can instead corrupt another in-flight command's PRP list.
Summary
What happened
Out-of-bounds write in the Linux 6.17 megaraid_sas driver allows local users to crash the kernel through large NVMe I/O requests. The megasas_make_prp_nvme() loop writes PRP entries into cmd->sg_frame without checking instance->max_chain_frame_sz, so a 4 MiB transfer can overrun the DMA-pool buffer by one page. Reachability requires an NVMe device behind a MegaRAID controller whose firmware reports a large MDTS; a mapped following page can instead corrupt another in-flight command's PRP list.
The record
- CVE
- CVE-2026-90008
- Published
- Sep 16, 2026
- Updated
- Sep 16, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1499.004
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 16, 2026CVE publishedPublication date reported by the CVE source.
- Sep 16, 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=6.17
- Affected versionversion=9b8b84879d4adc506b0d3944e20b28d9f3f6994b <4bb34769ef44ab3770b89e4055de6af4a458bec9
- Affected versionversion=9b8b84879d4adc506b0d3944e20b28d9f3f6994b <4dd118d06dec9efe5065ac7897bdc18f404a3af4
- Affected versionversion=9b8b84879d4adc506b0d3944e20b28d9f3f6994b <af8c27375733fb6a6df9fa484cda77cc3dd0cb80
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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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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