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scsi: scsi_debug: Fix REPORT ZONES alloc_len underflow OOB write

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

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
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Prerequisites
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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
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Publisher date
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