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GHSA-9XCF-HCJX-RJFR

Vulnerability from github – Published: 2026-08-22 18:30 – Updated: 2026-08-25 06:31

Details

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

ptp: ocp: Fix board ID over-read

The EEPROM board ID is a fixed 13-byte field and is not guaranteed to contain a NUL terminator. Passing it directly to devlink_info_version_fixed_put() treats it as a C string and may read beyond the field.

Format at most OCP_BOARD_ID_LEN bytes into the existing local buffer before reporting the ID. Use a precision limit because the snprintf() output size alone does not bound the source string scan.

Severity

7.1 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74603"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-22T16:16:32Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nptp: ocp: Fix board ID over-read\n\nThe EEPROM board ID is a fixed 13-byte field and is not guaranteed to\ncontain a NUL terminator. Passing it directly to\ndevlink_info_version_fixed_put() treats it as a C string and may read\nbeyond the field.\n\nFormat at most OCP_BOARD_ID_LEN bytes into the existing local buffer\nbefore reporting the ID. Use a precision limit because the snprintf()\noutput size alone does not bound the source string scan.",
  "id": "GHSA-9xcf-hcjx-rjfr",
  "modified": "2026-08-25T06:31:21Z",
  "published": "2026-08-22T18:30:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74603"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3d965811be78473654e6e8cc8e4fb7b6b87aa6c1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5fd91dd4a143479b0575fb1f202ec1c501e71fd5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6b69f2ef10cdb018c0b127a7cab88e590bbddba4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/72ef3ce80078199bfad32f98d055f44ba7cd0c3d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f8d7e5751267637190eff887c971d5b468106213"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f92558bbe78d6284fedd053900f82a70f0aa8707"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-74603 (GCVE-0-2026-74603)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:31 – Updated: 2026-08-25 05:40

Title

ptp: ocp: Fix board ID over-read

Summary

In the Linux kernel, the following vulnerability has been resolved: ptp: ocp: Fix board ID over-read The EEPROM board ID is a fixed 13-byte field and is not guaranteed to contain a NUL terminator. Passing it directly to devlink_info_version_fixed_put() treats it as a C string and may read beyond the field. Format at most OCP_BOARD_ID_LEN bytes into the existing local buffer before reporting the ID. Use a precision limit because the snprintf() output size alone does not bound the source string scan.

Severity

7.1 (High)


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

Assigner

Linux mitre root

References

6 references

URL	Tags
https://git.kernel.org/stable/c/72ef3ce80078199bf…
https://git.kernel.org/stable/c/3d965811be7847365…
https://git.kernel.org/stable/c/f92558bbe78d6284f…
https://git.kernel.org/stable/c/5fd91dd4a143479b0…
https://git.kernel.org/stable/c/f8d7e575126763719…
https://git.kernel.org/stable/c/6b69f2ef10cdb018c…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 0cfcdd1ebcfe1a9b262f6ad8419580720dc843c4 , < 72ef3ce80078199bfad32f98d055f44ba7cd0c3d (git) Affected: 0cfcdd1ebcfe1a9b262f6ad8419580720dc843c4 , < 3d965811be78473654e6e8cc8e4fb7b6b87aa6c1 (git) Affected: 0cfcdd1ebcfe1a9b262f6ad8419580720dc843c4 , < f92558bbe78d6284fedd053900f82a70f0aa8707 (git) Affected: 0cfcdd1ebcfe1a9b262f6ad8419580720dc843c4 , < 5fd91dd4a143479b0575fb1f202ec1c501e71fd5 (git) Affected: 0cfcdd1ebcfe1a9b262f6ad8419580720dc843c4 , < f8d7e5751267637190eff887c971d5b468106213 (git) Affected: 0cfcdd1ebcfe1a9b262f6ad8419580720dc843c4 , < 6b69f2ef10cdb018c0b127a7cab88e590bbddba4 (git)
Linux	Linux	Affected: 5.18 Unaffected: 0 , < 5.18 (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.152 , ≤ 6.6.* (semver) Unaffected: 6.12.104 , ≤ 6.12.* (semver) Unaffected: 6.18.45 , ≤ 6.18.* (semver) Unaffected: 7.1.9 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/ptp/ptp_ocp.c"
          ],
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            {
              "lessThan": "72ef3ce80078199bfad32f98d055f44ba7cd0c3d",
              "status": "affected",
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              "versionType": "git"
            }
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
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            },
            {
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              "status": "unaffected",
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              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
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            {
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              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
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                  "versionStartIncluding": "5.18",
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                {
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                {
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                }
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nptp: ocp: Fix board ID over-read\n\nThe EEPROM board ID is a fixed 13-byte field and is not guaranteed to\ncontain a NUL terminator. Passing it directly to\ndevlink_info_version_fixed_put() treats it as a C string and may read\nbeyond the field.\n\nFormat at most OCP_BOARD_ID_LEN bytes into the existing local buffer\nbefore reporting the ID. Use a precision limit because the snprintf()\noutput size alone does not bound the source string scan."
        }
      ],
      "metrics": [
        {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
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          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable code is reached only through the devlink generic-netlink interface (DEVLINK_CMD_INFO_GET) via a local socket; ptp_ocp is a PCI PTP timecard driver with no network, Bluetooth, or physical-device input path to ptp_ocp_devlink_info_get().\nAC:L - On a system with a probed OCP timecard, issuing devlink info deterministically calls ptp_ocp_devlink_info_get() and passes the 13-byte EEPROM board_id that is not guaranteed to be NUL-terminated, so the over-read is reliably triggered without races or attacker-uncontrollable layout.\nPR:L - DEVLINK_CMD_INFO_GET is registered with only GENL_CMD_CAP_DO/GENL_CMD_CAP_DUMP and no GENL_ADMIN_PERM, and devlink_nl_pre_doit() adds no capability check, so any unprivileged local user with generic netlink access can invoke the vulnerable handler.\nUI:N - Exploitation requires only the attacker issuing a devlink info netlink request; no administrator or other user action is needed beyond the attacker having local access to the host.\nS:U - Kernel memory disclosure and any resulting crash are confined to the same host kernel; the bug does not cross VM, IOMMU, or sandbox security boundaries.\nC:H - Passing the non-NUL-terminated board_id to devlink_info_version_fixed_put() makes devlink_info_version_put() and nla_put_string() use strlen(), reading past the 13-byte field through adjacent ptp_ocp/devlink private memory and returning leaked bytes in the netlink reply to the caller.\nI:N - The defect is purely an out-of-bounds kernel read with no write, heap corruption, or control-flow hijack primitive; only kernel memory is scanned and copied into the netlink response.\nA:H - strlen() on the unterminated board_id can walk through subsequent kmalloc-backed struct fields and potentially past the devlink private allocation, touching unmapped pages and oopsing/panicking the kernel; an unprivileged user can repeat the devlink info query to retrigger it."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-25T05:40:27.399Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/5fd91dd4a143479b0575fb1f202ec1c501e71fd5"
        },
        {
          "url": "https://git.kernel.org/stable/c/f8d7e5751267637190eff887c971d5b468106213"
        },
        {
          "url": "https://git.kernel.org/stable/c/6b69f2ef10cdb018c0b127a7cab88e590bbddba4"
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      ],
      "title": "ptp: ocp: Fix board ID over-read",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74603",
    "datePublished": "2026-08-22T15:31:51.544Z",
    "dateReserved": "2026-08-15T05:44:03.919Z",
    "dateUpdated": "2026-08-25T05:40:27.399Z",
    "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.

Detection rules are retrieved from Rulezet.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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