CVE-2026-74470 (GCVE-0-2026-74470)
Vulnerability from cvelistv5
Published
2026-08-15 12:27
Modified
2026-10-16 19:05
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: ebacb44cb2042b90951140eda806bedad23ef554
Version: 7db0e0c8190a086ef92ce5bb960836cde49540aa
Version: 7db0e0c8190a086ef92ce5bb960836cde49540aa
Version: 7db0e0c8190a086ef92ce5bb960836cde49540aa
Version: 7db0e0c8190a086ef92ce5bb960836cde49540aa
Version: 7db0e0c8190a086ef92ce5bb960836cde49540aa
Version: 7db0e0c8190a086ef92ce5bb960836cde49540aa
Version: c4d2d7c935a4ad20e8e726ca10499cefe4537103
Version: 5.15.8   ≤
Version: 5.10.85   ≤
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    "datePublished": "2026-08-15T12:27:07.504Z",
    "dateReserved": "2026-08-15T05:44:03.902Z",
    "dateUpdated": "2026-10-16T19:05:47.666Z",
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Attacker-controlled REPORT ZONES allocation length drives rep_max_zones and causes repeated 64-byte descriptor writes far beyond the allocated buffer, providing a kernel heap out-of-bounds write suitable for control-data corruption and privilege escalation.\\nA:H - Writing zone descriptors from arr+64 when the buffer is smaller than 64 bytes immediately corrupts out-of-bounds kernel memory and commonly triggers KASAN faults, kernel oops, or panic, satisfying High availability impact.\"}]}], \"affected\": [{\"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\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/7b615fc139e35c81077046df44725c532f7e2404\"}, {\"url\": \"https://git.kernel.org/stable/c/5d3e1d006bbb543259f9e31824caadbfff6a5465\"}, {\"url\": \"https://git.kernel.org/stable/c/49e5b25a0b74dbac595f122e5608fdce2918cc4e\"}, {\"url\": \"https://git.kernel.org/stable/c/495058429ca55ab7fcc21977b63b92907ad68066\"}, {\"url\": \"https://git.kernel.org/stable/c/2047ed09bf13453b7d6f9431b112ec07984dd69b\"}, {\"url\": \"https://git.kernel.org/stable/c/d6e6da6bc3b53231fac77ffab428da8173ee729c\"}, {\"url\": \"https://git.kernel.org/stable/c/93dde0bf2f39a0f9f57fd610aa3201ce5b753433\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nscsi: scsi_debug: Fix REPORT ZONES alloc_len underflow OOB write\\n\\nresp_report_zones() sizes the reply buffer from the CDB allocation\\nlength. The v3 fix rounds alloc_len up with ALIGN() before deriving the\\ndescriptor count:\\n\\n\\trep_max_zones = (ALIGN((u64)alloc_len, RZONES_DESC_HD) -\\n\\t\\t\\t RZONES_DESC_HD) \u003e\u003e ilog2(RZONES_DESC_HD);\\n\\tarr_len = (u64)RZONES_DESC_HD * (rep_max_zones + 1);\\n\\nFor alloc_len in 0xFFFFFFC1..0xFFFFFFFF, ALIGN() rounds up to\\n0x100000000, so arr_len is 4 GB. On 32-bit, kzalloc()\u0027s size_t is 32-bit\\nand truncates 0x100000000 to 0; kzalloc(0) returns ZERO_SIZE_PTR, which\\npasses the !arr check, and desc = arr + 64 is then dereferenced in the\\nloop -\u003e out-of-bounds write / panic.\\n\\nClamp rep_max_zones to devip-\u003enr_zones. The loop already stops at\\nsdebug_capacity (after nr_zones zones), so a report can never hold more\\nthan nr_zones descriptors; the clamp does not change the report, it only\\nbounds arr_len to (nr_zones + 1) * RZONES_DESC_HD, a real device\\nproperty that can never reach 0x100000000.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.217\", \"versionStartIncluding\": \"5.15.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.183\", \"versionStartIncluding\": \"5.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.151\", \"versionStartIncluding\": \"5.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.103\", \"versionStartIncluding\": \"5.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.44\", \"versionStartIncluding\": \"5.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.8\", \"versionStartIncluding\": \"5.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"5.16\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.10.85\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-23T12:47:20.125Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-74470\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-16T19:05:47.666Z\", \"dateReserved\": \"2026-08-15T05:44:03.902Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-15T12:27:07.504Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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