Kernel panic via REPORT ZONES size truncation
Published Aug 15, 2026 · Updated Aug 15, 2026
Out-of-bounds writing in the Linux kernel scsi_debug driver allows local users to crash 32-bit systems through a crafted REPORT ZONES command. In resp_report_zones(), ALIGN() rounds certain allocation lengths to 4 GB; 32-bit size_t truncation makes kzalloc(0) return a pointer that passes the null check before descriptor writes. Reachability requires a 32-bit kernel with scsi_debug configured for zoned operation and access to its SG_IO or BSG device node; the reported direct consequence is kernel heap corruption and panic.
Summary
What happened
Out-of-bounds writing in the Linux kernel scsi_debug driver allows local users to crash 32-bit systems through a crafted REPORT ZONES command. In resp_report_zones(), ALIGN() rounds certain allocation lengths to 4 GB; 32-bit size_t truncation makes kzalloc(0) return a pointer that passes the null check before descriptor writes. Reachability requires a 32-bit kernel with scsi_debug configured for zoned operation and access to its SG_IO or BSG device node; the reported direct consequence is kernel heap corruption and panic.
The record
- CVE
- CVE-2026-74470
- Published
- Aug 15, 2026
- Updated
- Aug 15, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 15, 2026CVE publishedPublication date reported by the CVE source.
- Aug 15, 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=5.10.85 <5.11
- Affected versionversion=5.15.8 <5.16
- Affected versionversion=5.16
- Affected versionversion=7db0e0c8190a086ef92ce5bb960836cde49540aa <2047ed09bf13453b7d6f9431b112ec07984dd69b
- Affected versionversion=7db0e0c8190a086ef92ce5bb960836cde49540aa <495058429ca55ab7fcc21977b63b92907ad68066
- Affected versionversion=7db0e0c8190a086ef92ce5bb960836cde49540aa <49e5b25a0b74dbac595f122e5608fdce2918cc4e
- Affected versionversion=7db0e0c8190a086ef92ce5bb960836cde49540aa <93dde0bf2f39a0f9f57fd610aa3201ce5b753433
- Affected versionversion=7db0e0c8190a086ef92ce5bb960836cde49540aa <d6e6da6bc3b53231fac77ffab428da8173ee729c
- Affected versionversion=c4d2d7c935a4ad20e8e726ca10499cefe4537103
- Affected versionversion=ebacb44cb2042b90951140eda806bedad23ef554
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What is affected?
Published CVSS scores
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Attacks
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