Vulnerability-Lookup

GHSA-P577-8XFH-JM39

Vulnerability from github – Published: 2025-07-28 12:30 – Updated: 2025-11-19 18:31

Details

In the Linux kernel, the following vulnerability has been resolved:

iio: backend: fix out-of-bound write

The buffer is set to 80 character. If a caller write more characters, count is truncated to the max available space in "simple_write_to_buffer". But afterwards a string terminator is written to the buffer at offset count without boundary check. The zero termination is written OUT-OF-BOUND.

Add a check that the given buffer is smaller then the buffer to prevent.

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2025-38484"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-787"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-07-28T12:15:30Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\niio: backend: fix out-of-bound write\n\nThe buffer is set to 80 character. If a caller write more characters,\ncount is truncated to the max available space in \"simple_write_to_buffer\".\nBut afterwards a string terminator is written to the buffer at offset count\nwithout boundary check. The zero termination is written OUT-OF-BOUND.\n\nAdd a check that the given buffer is smaller then the buffer to prevent.",
  "id": "GHSA-p577-8xfh-jm39",
  "modified": "2025-11-19T18:31:17Z",
  "published": "2025-07-28T12:30:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38484"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/01e941aa7f5175125df4ac5d3aab099961525602"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6eea9f7648ddb9e4903735a1f77cf196c957aa38"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/da9374819eb3885636934c1006d450c3cb1a02ed"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2025-38484 (GCVE-0-2025-38484)

Vulnerability from cvelistv5 – Published: 2025-07-28 11:21 – Updated: 2026-08-05 12:02

Title

iio: backend: fix out-of-bound write

Summary

In the Linux kernel, the following vulnerability has been resolved: iio: backend: fix out-of-bound write The buffer is set to 80 character. If a caller write more characters, count is truncated to the max available space in "simple_write_to_buffer". But afterwards a string terminator is written to the buffer at offset count without boundary check. The zero termination is written OUT-OF-BOUND. Add a check that the given buffer is smaller then the buffer to prevent.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root Scorecard

References

3 references

URL	Tags
https://git.kernel.org/stable/c/6eea9f7648ddb9e49…
https://git.kernel.org/stable/c/01e941aa7f5175125…
https://git.kernel.org/stable/c/da9374819eb388563…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: df3892e5e861c43d5612728ed259634675b8a71f , < 6eea9f7648ddb9e4903735a1f77cf196c957aa38 (git) Affected: 035b4989211dc1c8626e186d655ae8ca5141bb73 , < 01e941aa7f5175125df4ac5d3aab099961525602 (git) Affected: 035b4989211dc1c8626e186d655ae8ca5141bb73 , < da9374819eb3885636934c1006d450c3cb1a02ed (git) Affected: 04271a4d2740f98bbe36f82cd3d74677a839d1eb (git) Affected: fd791c81f410ab1c554686a6f486dc7a176dfe35 (git) Affected: 6.12.23 , < 6.12.40 (semver) Affected: 6.13.11 , < 6.14 (semver) Affected: 6.14.2 , < 6.15 (semver)
Linux	Linux	Affected: 6.15 Unaffected: 0 , < 6.15 (semver) Unaffected: 6.12.40 , ≤ 6.12.* (semver) Unaffected: 6.15.8 , ≤ 6.15.* (semver) Unaffected: 6.16 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/iio/industrialio-backend.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6eea9f7648ddb9e4903735a1f77cf196c957aa38",
              "status": "affected",
              "version": "df3892e5e861c43d5612728ed259634675b8a71f",
              "versionType": "git"
            },
            {
              "lessThan": "01e941aa7f5175125df4ac5d3aab099961525602",
              "status": "affected",
              "version": "035b4989211dc1c8626e186d655ae8ca5141bb73",
              "versionType": "git"
            },
            {
              "lessThan": "da9374819eb3885636934c1006d450c3cb1a02ed",
              "status": "affected",
              "version": "035b4989211dc1c8626e186d655ae8ca5141bb73",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "04271a4d2740f98bbe36f82cd3d74677a839d1eb",
              "versionType": "git"
            },
            {
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              "version": "fd791c81f410ab1c554686a6f486dc7a176dfe35",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "6.12.23",
              "versionType": "semver"
            },
            {
              "lessThan": "6.14",
              "status": "affected",
              "version": "6.13.11",
              "versionType": "semver"
            },
            {
              "lessThan": "6.15",
              "status": "affected",
              "version": "6.14.2",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/iio/industrialio-backend.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "6.15"
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            {
              "lessThan": "6.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.15.*",
              "status": "unaffected",
              "version": "6.15.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.40",
                  "versionStartIncluding": "6.12.23",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.15.8",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16",
                  "versionStartIncluding": "6.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.13.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.14.2",
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                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niio: backend: fix out-of-bound write\n\nThe buffer is set to 80 character. If a caller write more characters,\ncount is truncated to the max available space in \"simple_write_to_buffer\".\nBut afterwards a string terminator is written to the buffer at offset count\nwithout boundary check. The zero termination is written OUT-OF-BOUND.\n\nAdd a check that the given buffer is smaller then the buffer to prevent."
        }
      ],
      "metrics": [
        {
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            "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 vulnerable code is reached only by a local `write(2)`/`pwrite(2)` on the debugfs file `/sys/kernel/debug/iio/iio:deviceN/backendM/direct_reg_access`. There is no network or remote data path into `iio_backend_debugfs_write_reg()`.\nAC:L - A single `write()` with any length \u2265 80 deterministically executes `buf[count] = \u0027\\0\u0027` out of bounds, and the attacker directly chooses the corruption offset via the syscall length. No race, no memory-layout precondition, and no unpredictable state is involved.\nPR:L - The debugfs node is created 0600, but debugfs on industrial/embedded IIO deployments is routinely mounted and permission-relaxed for instrumentation tooling, making the write reachable by an unprivileged local account; consistent with this CNA\u0027s scoring of comparable debugfs memory-corruption bugs (CVE-2026-43380, CVE-2026-46190). Choosing the higher-severity option where reachability depends on deployment configuration.\nUI:N - The attacker triggers the bug entirely on their own with one write syscall against an already-present device node. No action by any other user or administrator is required.\nS:U - The out-of-bounds write corrupts kernel memory within the same kernel security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - Attacker-controlled stack corruption at a chosen offset can truncate saved pointers and length/size fields, which is readily leveraged into kernel memory disclosure, and full kernel compromise implies unrestricted read of system memory.\nI:H - This is a direct out-of-bounds write with an attacker-chosen offset spanning the kernel stack (return addresses, saved registers, stack canary) and, on non-VMAP_STACK builds, adjacent lowmem \u2014 a NUL-byte poisoning primitive usable for control-flow hijack and privilege escalation.\nA:H - Overwriting the stack canary, a return address, or hitting the VMAP_STACK guard page with a large offset causes an immediate kernel panic/oops, and the write can be repeated at will."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:02:16.576Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        {
          "url": "https://git.kernel.org/stable/c/01e941aa7f5175125df4ac5d3aab099961525602"
        },
        {
          "url": "https://git.kernel.org/stable/c/da9374819eb3885636934c1006d450c3cb1a02ed"
        }
      ],
      "title": "iio: backend: fix out-of-bound write",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38484",
    "datePublished": "2025-07-28T11:21:48.690Z",
    "dateReserved": "2025-04-16T04:51:24.021Z",
    "dateUpdated": "2026-08-05T12:02:16.576Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GHSA-P577-8XFH-JM39

CVE-2025-38484 (GCVE-0-2025-38484)

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