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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-74470 Detail

Description

In the Linux kernel, the following vulnerability has been resolved: scsi: scsi_debug: Fix REPORT ZONES alloc_len underflow OOB write resp_report_zones() sizes the reply buffer from the CDB allocation length. The v3 fix rounds alloc_len up with ALIGN() before deriving the descriptor count: rep_max_zones = (ALIGN((u64)alloc_len, RZONES_DESC_HD) - RZONES_DESC_HD) >> ilog2(RZONES_DESC_HD); arr_len = (u64)RZONES_DESC_HD * (rep_max_zones + 1); For alloc_len in 0xFFFFFFC1..0xFFFFFFFF, ALIGN() rounds up to 0x100000000, so arr_len is 4 GB. On 32-bit, kzalloc()'s size_t is 32-bit and truncates 0x100000000 to 0; kzalloc(0) returns ZERO_SIZE_PTR, which passes the !arr check, and desc = arr + 64 is then dereferenced in the loop -> out-of-bounds write / panic. Clamp rep_max_zones to devip->nr_zones. The loop already stops at sdebug_capacity (after nr_zones zones), so a report can never hold more than nr_zones descriptors; the clamp does not change the report, it only bounds arr_len to (nr_zones + 1) * RZONES_DESC_HD, a real device property that can never reach 0x100000000.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/2047ed09bf13453b7d6f9431b112ec07984dd69b kernel.org
https://git.kernel.org/stable/c/495058429ca55ab7fcc21977b63b92907ad68066 kernel.org
https://git.kernel.org/stable/c/49e5b25a0b74dbac595f122e5608fdce2918cc4e kernel.org
https://git.kernel.org/stable/c/5d3e1d006bbb543259f9e31824caadbfff6a5465 kernel.org
https://git.kernel.org/stable/c/7b615fc139e35c81077046df44725c532f7e2404 kernel.org
https://git.kernel.org/stable/c/93dde0bf2f39a0f9f57fd610aa3201ce5b753433 kernel.org
https://git.kernel.org/stable/c/d6e6da6bc3b53231fac77ffab428da8173ee729c kernel.org

Weakness Enumeration

CWE-ID CWE Name Source

Change History

4 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-74470
NVD Published Date:
08/15/2026
NVD Last Modified:
08/23/2026
Source:
kernel.org