CVE-2025-38538 (GCVE-0-2025-38538)
Vulnerability from cvelistv5
Published
2025-08-16 11:12
Modified
2025-08-16 11:12
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: dmaengine: nbpfaxi: Fix memory corruption in probe() The nbpf->chan[] array is allocated earlier in the nbpf_probe() function and it has "num_channels" elements. These three loops iterate one element farther than they should and corrupt memory. The changes to the second loop are more involved. In this case, we're copying data from the irqbuf[] array into the nbpf->chan[] array. If the data in irqbuf[i] is the error IRQ then we skip it, so the iterators are not in sync. I added a check to ensure that we don't go beyond the end of the irqbuf[] array. I'm pretty sure this can't happen, but it seemed harmless to add a check. On the other hand, after the loop has ended there is a check to ensure that the "chan" iterator is where we expect it to be. In the original code we went one element beyond the end of the array so the iterator wasn't in the correct place and it would always return -EINVAL. However, now it will always be in the correct place. I deleted the check since we know the result.
References
Impacted products
Vendor Product Version
Linux Linux Version: b45b262cefd5b8eb2ba88d20e5bd295881293894
Version: b45b262cefd5b8eb2ba88d20e5bd295881293894
Version: b45b262cefd5b8eb2ba88d20e5bd295881293894
Version: b45b262cefd5b8eb2ba88d20e5bd295881293894
Version: b45b262cefd5b8eb2ba88d20e5bd295881293894
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/dma/nbpfaxi.c"
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          "vendor": "Linux",
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              "status": "unaffected",
              "version": "6.6.100",
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              "status": "unaffected",
              "version": "6.12.40",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.15.8",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix"
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        }
      ],
      "cpeApplicability": [
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          "nodes": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: nbpfaxi: Fix memory corruption in probe()\n\nThe nbpf-\u003echan[] array is allocated earlier in the nbpf_probe() function\nand it has \"num_channels\" elements.  These three loops iterate one\nelement farther than they should and corrupt memory.\n\nThe changes to the second loop are more involved.  In this case, we\u0027re\ncopying data from the irqbuf[] array into the nbpf-\u003echan[] array.  If\nthe data in irqbuf[i] is the error IRQ then we skip it, so the iterators\nare not in sync.  I added a check to ensure that we don\u0027t go beyond the\nend of the irqbuf[] array.  I\u0027m pretty sure this can\u0027t happen, but it\nseemed harmless to add a check.\n\nOn the other hand, after the loop has ended there is a check to ensure\nthat the \"chan\" iterator is where we expect it to be.  In the original\ncode we went one element beyond the end of the array so the iterator\nwasn\u0027t in the correct place and it would always return -EINVAL.  However,\nnow it will always be in the correct place.  I deleted the check since\nwe know the result."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-08-16T11:12:30.878Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f366b36c5e3ce29c9a3c8eed3d1631908e4fc8bb"
        },
        {
          "url": "https://git.kernel.org/stable/c/4bb016438335ec02b01f96bf1367378c2bfe03e5"
        },
        {
          "url": "https://git.kernel.org/stable/c/122160289adf8ebf15060f1cbf6265b55a914948"
        },
        {
          "url": "https://git.kernel.org/stable/c/d6bbd67ab5de37a74ac85c83c5a26664b62034dd"
        },
        {
          "url": "https://git.kernel.org/stable/c/188c6ba1dd925849c5d94885c8bbdeb0b3dcf510"
        }
      ],
      "title": "dmaengine: nbpfaxi: Fix memory corruption in probe()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38538",
    "datePublished": "2025-08-16T11:12:30.878Z",
    "dateReserved": "2025-04-16T04:51:24.024Z",
    "dateUpdated": "2025-08-16T11:12:30.878Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38538\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-08-16T12:15:29.593\",\"lastModified\":\"2025-08-16T12:15:29.593\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndmaengine: nbpfaxi: Fix memory corruption in probe()\\n\\nThe nbpf-\u003echan[] array is allocated earlier in the nbpf_probe() function\\nand it has \\\"num_channels\\\" elements.  These three loops iterate one\\nelement farther than they should and corrupt memory.\\n\\nThe changes to the second loop are more involved.  In this case, we\u0027re\\ncopying data from the irqbuf[] array into the nbpf-\u003echan[] array.  If\\nthe data in irqbuf[i] is the error IRQ then we skip it, so the iterators\\nare not in sync.  I added a check to ensure that we don\u0027t go beyond the\\nend of the irqbuf[] array.  I\u0027m pretty sure this can\u0027t happen, but it\\nseemed harmless to add a check.\\n\\nOn the other hand, after the loop has ended there is a check to ensure\\nthat the \\\"chan\\\" iterator is where we expect it to be.  In the original\\ncode we went one element beyond the end of the array so the iterator\\nwasn\u0027t in the correct place and it would always return -EINVAL.  However,\\nnow it will always be in the correct place.  I deleted the check since\\nwe know the result.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/122160289adf8ebf15060f1cbf6265b55a914948\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/188c6ba1dd925849c5d94885c8bbdeb0b3dcf510\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4bb016438335ec02b01f96bf1367378c2bfe03e5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d6bbd67ab5de37a74ac85c83c5a26664b62034dd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f366b36c5e3ce29c9a3c8eed3d1631908e4fc8bb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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