scsi: scsi_debug: Fix REPORT ZONES alloc_len underflow OOB write

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74470
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 13:17:51 UTC
Updated2026-08-19 17:21:04 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001290000 probability, percentile 0.029440000 (date 2026-08-19)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 7db0e0c8190a086ef92ce5bb960836cde49540aa 5d3e1d006bbb543259f9e31824caadbfff6a5465 git Not specified
CNA Linux Linux affected 7db0e0c8190a086ef92ce5bb960836cde49540aa 49e5b25a0b74dbac595f122e5608fdce2918cc4e git Not specified
CNA Linux Linux affected 7db0e0c8190a086ef92ce5bb960836cde49540aa 495058429ca55ab7fcc21977b63b92907ad68066 git Not specified
CNA Linux Linux affected 7db0e0c8190a086ef92ce5bb960836cde49540aa 2047ed09bf13453b7d6f9431b112ec07984dd69b git Not specified
CNA Linux Linux affected 7db0e0c8190a086ef92ce5bb960836cde49540aa d6e6da6bc3b53231fac77ffab428da8173ee729c git Not specified
CNA Linux Linux affected 7db0e0c8190a086ef92ce5bb960836cde49540aa 93dde0bf2f39a0f9f57fd610aa3201ce5b753433 git Not specified
CNA Linux Linux affected c4d2d7c935a4ad20e8e726ca10499cefe4537103 git Not specified
CNA Linux Linux affected ebacb44cb2042b90951140eda806bedad23ef554 git Not specified
CNA Linux Linux affected 5.10.85 5.11 semver Not specified
CNA Linux Linux affected 5.15.8 5.16 semver Not specified
CNA Linux Linux affected 5.16 Not specified
CNA Linux Linux unaffected 5.16 semver Not specified
CNA Linux Linux unaffected 6.1.183 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.151 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.103 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/d6e6da6bc3b53231fac77ffab428da8173ee729c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/495058429ca55ab7fcc21977b63b92907ad68066 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/49e5b25a0b74dbac595f122e5608fdce2918cc4e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2047ed09bf13453b7d6f9431b112ec07984dd69b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5d3e1d006bbb543259f9e31824caadbfff6a5465 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/93dde0bf2f39a0f9f57fd610aa3201ce5b753433 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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