CVE-2026-74470 (GCVE-0-2026-74470)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-23 12:47
VLAI
Title
scsi: scsi_debug: Fix REPORT ZONES alloc_len underflow OOB write
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ebacb44cb2042b90951140eda806bedad23ef554 , < 7b615fc139e35c81077046df44725c532f7e2404 (git)
Affected: 7db0e0c8190a086ef92ce5bb960836cde49540aa , < 5d3e1d006bbb543259f9e31824caadbfff6a5465 (git)
Affected: 7db0e0c8190a086ef92ce5bb960836cde49540aa , < 49e5b25a0b74dbac595f122e5608fdce2918cc4e (git)
Affected: 7db0e0c8190a086ef92ce5bb960836cde49540aa , < 495058429ca55ab7fcc21977b63b92907ad68066 (git)
Affected: 7db0e0c8190a086ef92ce5bb960836cde49540aa , < 2047ed09bf13453b7d6f9431b112ec07984dd69b (git)
Affected: 7db0e0c8190a086ef92ce5bb960836cde49540aa , < d6e6da6bc3b53231fac77ffab428da8173ee729c (git)
Affected: 7db0e0c8190a086ef92ce5bb960836cde49540aa , < 93dde0bf2f39a0f9f57fd610aa3201ce5b753433 (git)
Affected: c4d2d7c935a4ad20e8e726ca10499cefe4537103 (git)
Affected: 5.15.8 , < 5.15.217 (semver)
Affected: 5.10.85 , < 5.11 (semver)
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Linux Linux Affected: 5.16
Unaffected: 0 , < 5.16 (semver)
Unaffected: 5.15.217 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.151 , ≤ 6.6.* (semver)
Unaffected: 6.12.103 , ≤ 6.12.* (semver)
Unaffected: 6.18.44 , ≤ 6.18.* (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "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."
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            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "value": "AV:L - The bug is reached by sending a crafted ZONE IN REPORT ZONES SCSI CDB through local SG_IO/BSG ioctl on a scsi_debug zoned LUN; scsi_debug is a pseudo host simulator with no native network protocol handler.\nAC:L - Once scsi_debug is loaded in host-managed zoned mode, a single REPORT ZONES command with ALLOCATION LENGTH 1-63 reliably underflows rep_max_zones and forces heap writes past a tiny kzalloc buffer; no races or victim-dependent timing are required.\nPR:L - ZBC_IN is whitelisted in scsi_cmd_allowed() without CAP_SYS_RAWIO, so any local user who can open the scsi_debug /dev/sg or BSG node (e.g., disk group) can issue the malicious CDB; module load and zoned setup are environmental, not exploit-time privileges.\nUI:N - Exploitation requires only the attacker issuing SG_IO/BSG with a malicious REPORT ZONES CDB; no separate victim interaction such as mounting media or clicking a prompt is needed.\nS:U - The out-of-bounds write corrupts kernel heap memory in the same host kernel security authority; it is not a VM escape, IOMMU bypass, or other cross-boundary compromise.\nC:H - The kmalloc heap out-of-bounds write can corrupt adjacent slab objects and be groomed into arbitrary kernel memory disclosure primitives; per kernel guidance, exploitable out-of-bounds writes warrant High confidentiality impact.\nI:H - 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."
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      "title": "scsi: scsi_debug: Fix REPORT ZONES alloc_len underflow OOB write",
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    "datePublished": "2026-08-15T12:27:07.504Z",
    "dateReserved": "2026-08-15T05:44:03.902Z",
    "dateUpdated": "2026-08-23T12:47:20.125Z",
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/scsi/scsi_debug.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"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\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/scsi/scsi_debug.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.16\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.16\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.217\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.151\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.103\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.44\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.8\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2047ed09bf13453b7d6f9431b112ec07984dd69b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/495058429ca55ab7fcc21977b63b92907ad68066\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/49e5b25a0b74dbac595f122e5608fdce2918cc4e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5d3e1d006bbb543259f9e31824caadbfff6a5465\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7b615fc139e35c81077046df44725c532f7e2404\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/93dde0bf2f39a0f9f57fd610aa3201ce5b753433\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d6e6da6bc3b53231fac77ffab428da8173ee729c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T14:55:35+00:00",
      "cve": "CVE-2026-74470",
      "id": "CVE-2026-74470",
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      "product_status:known_affected": "246",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: scsi: scsi_debug: Fix REPORT ZONES alloc_len underflow OOB write",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74470.json",
      "version": "3"
    },
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      "aggregate_severity": "important",
      "current_release_date": "2026-08-17T16:26:48Z",
      "cve": "CVE-2026-74470",
      "id": "CVE-2026-74470",
      "initial_release_date": "2026-08-15T23:52:21Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74470",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74470.json",
      "version": "3"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.