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CVE-2023-54234 (GCVE-0-2023-54234)

Vulnerability from cvelistv5 – Published: 2025-12-30 12:11 – Updated: 2026-08-05 09:18
VLAI
Title
scsi: mpi3mr: Fix missing mrioc->evtack_cmds initialization
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: mpi3mr: Fix missing mrioc->evtack_cmds initialization Commit c1af985d27da ("scsi: mpi3mr: Add Event acknowledgment logic") introduced an array mrioc->evtack_cmds but initialization of the array elements was missed. They are just zero cleared. The function mpi3mr_complete_evt_ack() refers host_tag field of the elements. Due to the zero value of the host_tag field, the function calls clear_bit() for mrico->evtack_cmds_bitmap with wrong bit index. This results in memory access to invalid address and "BUG: KASAN: use-after-free". This BUG was observed at eHBA-9600 firmware update to version 8.3.1.0. To fix it, add the missing initialization of mrioc->evtack_cmds.
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: c1af985d27da2d530c22604644e9025810f57d7c , < 4e0dfdb48a824deac3dfbc67fb856ef2aee13529 (git)
Affected: c1af985d27da2d530c22604644e9025810f57d7c , < 67989091e11a974003ddf2ec39bc613df8eadd83 (git)
Affected: c1af985d27da2d530c22604644e9025810f57d7c , < e39ea831ebad4ab15c4748cb62a397a8abcca36e (git)
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Linux Linux Affected: 5.17
Unaffected: 0 , < 5.17 (semver)
Unaffected: 6.1.16 , ≤ 6.1.* (semver)
Unaffected: 6.2.3 , ≤ 6.2.* (semver)
Unaffected: 6.3 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/scsi/mpi3mr/mpi3mr_os.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
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              "status": "affected",
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              "versionType": "git"
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          "versions": [
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              "versionType": "semver"
            },
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              ],
              "negate": false,
              "operator": "OR"
            }
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: mpi3mr: Fix missing mrioc-\u003eevtack_cmds initialization\n\nCommit c1af985d27da (\"scsi: mpi3mr: Add Event acknowledgment logic\")\nintroduced an array mrioc-\u003eevtack_cmds but initialization of the array\nelements was missed. They are just zero cleared. The function\nmpi3mr_complete_evt_ack() refers host_tag field of the elements. Due to the\nzero value of the host_tag field, the function calls clear_bit() for\nmrico-\u003eevtack_cmds_bitmap with wrong bit index. This results in memory\naccess to invalid address and \"BUG: KASAN: use-after-free\". This BUG was\nobserved at eHBA-9600 firmware update to version 8.3.1.0. To fix it, add\nthe missing initialization of mrioc-\u003eevtack_cmds."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerability is in a Broadcom MPI3 SAS/NVMe HBA driver and is reached through local controller reset/error-recovery paths and the local BSG management interface; there is no network-facing protocol handler involved.\nAC:L - Once a PREPARE_FOR_RESET event with ACK_REQUIRED has left evtack_cmds[0] permanently PENDING, the very next controller reset deterministically executes clear_bit() at fixed index 65512, with no race to win and no memory-layout precondition; the reporter reproduced it reliably on firmware update.\nPR:L - An unprivileged local user with ordinary I/O access to storage behind the HBA can drive the controller into the timeout/fault reset paths (MPI3MR_RESET_FROM_FIRMWARE, mpi3mr_fw.c:2468-2513) that call mpi3mr_flush_drv_cmds(); no capability check guards those escalation paths, so real root is not required.\nUI:N - The corrupting code runs entirely inside driver reset handling and the admin reply/interrupt path; no victim action such as mounting a filesystem or opening a file is needed.\nS:U - The out-of-bounds write corrupts kernel slab memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - A wild out-of-bounds bit write 8184 bytes past an 8-byte allocation corrupts an unrelated kernel object; clearing a bit in adjacent slab state (flags, length fields, pointer bits) can be groomed into an information-disclosure primitive, and KASAN classified the access as use-after-free.\nI:H - clear_bit() performs a read-modify-write far outside the bitmap allocation, giving an out-of-bounds write into arbitrary neighbouring slab memory \u2014 per guidance an OOB write is High, and with heap grooming the corrupted victim object can yield control over kernel data.\nA:H - The out-of-bounds write silently corrupts an unrelated freed/live slab object, producing the observed KASAN use-after-free splat and leading to kernel oops or panic during controller reset."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T09:18:14.409Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4e0dfdb48a824deac3dfbc67fb856ef2aee13529"
        },
        {
          "url": "https://git.kernel.org/stable/c/67989091e11a974003ddf2ec39bc613df8eadd83"
        },
        {
          "url": "https://git.kernel.org/stable/c/e39ea831ebad4ab15c4748cb62a397a8abcca36e"
        }
      ],
      "title": "scsi: mpi3mr: Fix missing mrioc-\u003eevtack_cmds initialization",
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        "engine": "bippy-1.2.0"
      }
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-54234",
    "datePublished": "2025-12-30T12:11:25.021Z",
    "dateReserved": "2025-12-30T12:06:44.507Z",
    "dateUpdated": "2026-08-05T09:18:14.409Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2023-54234",
      "date": "2026-09-16",
      "epss": "0.00144",
      "percentile": "0.04032"
    },
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-04T22:54:13+00:00",
      "cve": "CVE-2023-54234",
      "id": "CVE-2023-54234",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:fixed": "120",
      "product_status:known_affected": "124",
      "product_status:known_not_affected": "118",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: scsi: mpi3mr: Fix missing mrioc-\u003eevtack_cmds initialization",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-54234.json",
      "version": "3"
    },
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      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-31T00:52:57Z",
      "cve": "CVE-2023-54234",
      "id": "CVE-2023-54234",
      "initial_release_date": "2025-12-31T00:27:53Z",
      "product_status:known_affected": "374",
      "product_status:known_not_affected": "493",
      "product_status:recommended": "136",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2023-54234",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-54234.json",
      "version": "21"
    }
  }
}



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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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