scsi: scsi_debug: Fix REPORT ZONES alloc_len underflow OOB write
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.
CVE-2026-74470
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-74470
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "ebacb44cb2042b90951140eda806bedad23ef554",
"lessThan": "7b615fc139e35c81077046df44725c532f7e2404",
"versionType": "git"
},
{
"status": "affected",
"version": "7db0e0c8190a086ef92ce5bb960836cde49540aa",
"lessThan": "5d3e1d006bbb543259f9e31824caadbfff6a5465",
"versionType": "git"
},
{
"status": "affected",
"version": "7db0e0c8190a086ef92ce5bb960836cde49540aa",
"lessThan": "49e5b25a0b74dbac595f122e5608fdce2918cc4e",
"versionType": "git"
},
{
"status": "affected",
"version": "7db0e0c8190a086ef92ce5bb960836cde49540aa",
"lessThan": "495058429ca55ab7fcc21977b63b92907ad68066",
"versionType": "git"
},
{
"status": "affected",
"version": "7db0e0c8190a086ef92ce5bb960836cde49540aa",
"lessThan": "2047ed09bf13453b7d6f9431b112ec07984dd69b",
"versionType": "git"
},
{
"status": "affected",
"version": "7db0e0c8190a086ef92ce5bb960836cde49540aa",
"lessThan": "d6e6da6bc3b53231fac77ffab428da8173ee729c",
"versionType": "git"
},
{
"status": "affected",
"version": "7db0e0c8190a086ef92ce5bb960836cde49540aa",
"lessThan": "93dde0bf2f39a0f9f57fd610aa3201ce5b753433",
"versionType": "git"
},
{
"status": "affected",
"version": "c4d2d7c935a4ad20e8e726ca10499cefe4537103",
"versionType": "git"
},
{
"status": "affected",
"version": "5.15.8",
"lessThan": "5.15.217",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.10.85",
"lessThan": "5.11",
"versionType": "semver"
}
],
"programFiles": [
"drivers/scsi/scsi_debug.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.16"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.16",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.15.217",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.151",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.103",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.44",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.8",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/scsi/scsi_debug.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74470
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #33165 · Revision 1
- Added to Heist Feed
- Publisher date