CVE-2023-54104 (GCVE-0-2023-54104)
Vulnerability from cvelistv5
Published
2025-12-24 13:06
Modified
2026-08-05 09:17
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: mtd: rawnand: fsl_upm: Fix an off-by one test in fun_exec_op() 'op-cs' is copied in 'fun->mchip_number' which is used to access the 'mchip_offsets' and the 'rnb_gpio' arrays. These arrays have NAND_MAX_CHIPS elements, so the index must be below this limit. Fix the sanity check in order to avoid the NAND_MAX_CHIPS value. This would lead to out-of-bound accesses.
References
Impacted products
Vendor Product Version
Linux Linux Version: 54309d65776755bcdb9dcf3744cd764fc1e254ea
Version: 54309d65776755bcdb9dcf3744cd764fc1e254ea
Version: 54309d65776755bcdb9dcf3744cd764fc1e254ea
Version: 54309d65776755bcdb9dcf3744cd764fc1e254ea
Version: 54309d65776755bcdb9dcf3744cd764fc1e254ea
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/mtd/nand/raw/fsl_upm.c"
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          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.9"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.10.190",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.126",
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            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.45",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.4.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.5",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "5.9",
                  "vulnerable": true
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                {
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                  "versionEndExcluding": "5.15.126",
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                  "vulnerable": true
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                {
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                  "vulnerable": true
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                  "vulnerable": true
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmtd: rawnand: fsl_upm: Fix an off-by one test in fun_exec_op()\n\n\u0027op-cs\u0027 is copied in \u0027fun-\u003emchip_number\u0027 which is used to access the\n\u0027mchip_offsets\u0027 and the \u0027rnb_gpio\u0027 arrays.\nThese arrays have NAND_MAX_CHIPS elements, so the index must be below this\nlimit.\n\nFix the sanity check in order to avoid the NAND_MAX_CHIPS value. This\nwould lead to out-of-bound accesses."
        }
      ],
      "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 fsl_upm NAND controller is reached only through the local MTD stack \u2014 /dev/mtdX ioctls or file I/O on a NAND-backed JFFS2/UBIFS volume. There is no network or remote-peer input into this driver.\nAC:L - There is no race, no memory-layout requirement, and no timing window; the faulty bounds check is the only guard on the index, and NAND operations can be driven repeatedly and deterministically by ordinary filesystem traffic.\nPR:L - An unprivileged local user reading or writing files on a mounted NAND-backed filesystem drives nand_exec_op() and thus fun_exec_op(); direct /dev/mtdX access is not required, so real root is not needed.\nUI:N - The code path executes as part of routine NAND I/O initiated by the attacker; no action by any other user or administrator is required.\nS:U - The out-of-bounds accesses stay within the kernel\u0027s own security authority \u2014 corrupted state and the wild pointer belong to the same kernel, with no VM, IOMMU, or sandbox boundary crossed.\nC:H - The out-of-bounds index yields an unintended reg_offs, so in_8() reads localbus MMIO outside the intended chip window straight into the caller\u0027s data buffer, and the adjacent struct field is read as a pointer \u2014 an out-of-bounds read that can disclose kernel and device state.\nI:H - The same bogus reg_offs is used by out_8() in the NAND_OP_DATA_OUT path, producing attacker-influenced writes to localbus registers outside the intended window; out-of-bounds writes are scored High.\nA:H - fun-\u003ernb_gpio[NAND_MAX_CHIPS] reads adjacent struct data as a struct gpio_desc pointer and dereferences it in gpiod_get_value_cansleep(), and the bogus MMIO offset can hit unmapped localbus space \u2014 either results in a kernel oops."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T09:17:18.597Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1f09d67d390647f83f8f9d26382b0daa43756e6f"
        },
        {
          "url": "https://git.kernel.org/stable/c/eb7a5e4d14c8659cb97db6863316280e15f67209"
        },
        {
          "url": "https://git.kernel.org/stable/c/f4b700c71802c81e6f9dce362ee7a0312c8377ba"
        },
        {
          "url": "https://git.kernel.org/stable/c/49e57caf967a969f6b955c88805f2d160910aa12"
        },
        {
          "url": "https://git.kernel.org/stable/c/c6abce60338aa2080973cd95be0aedad528bb41f"
        }
      ],
      "title": "mtd: rawnand: fsl_upm: Fix an off-by one test in fun_exec_op()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-54104",
    "datePublished": "2025-12-24T13:06:29.354Z",
    "dateReserved": "2025-12-24T13:02:52.517Z",
    "dateUpdated": "2026-08-05T09:17:18.597Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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