Vulnerability-Lookup

GHSA-3CW8-5H35-W527

Vulnerability from github – Published: 2025-12-24 12:30 – Updated: 2026-07-30 06:32

Details

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

spi: ch341: fix out-of-bounds memory access in ch341_transfer_one

Discovered by Atuin - Automated Vulnerability Discovery Engine.

The 'len' variable is calculated as 'min(32, trans->len + 1)', which includes the 1-byte command header.

When copying data from 'trans->tx_buf' to 'ch341->tx_buf + 1', using 'len' as the length is incorrect because:

It causes an out-of-bounds read from 'trans->tx_buf' (which has size 'trans->len', i.e., 'len - 1' in this context).
It can cause an out-of-bounds write to 'ch341->tx_buf' if 'len' is CH341_PACKET_LENGTH (32). Writing 32 bytes to ch341->tx_buf + 1 overflows the buffer.

Fix this by copying 'len - 1' bytes.

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-2025-68352"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-24T11:15:58Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nspi: ch341: fix out-of-bounds memory access in ch341_transfer_one\n\nDiscovered by Atuin - Automated Vulnerability Discovery Engine.\n\nThe \u0027len\u0027 variable is calculated as \u0027min(32, trans-\u003elen + 1)\u0027,\nwhich includes the 1-byte command header.\n\nWhen copying data from \u0027trans-\u003etx_buf\u0027 to \u0027ch341-\u003etx_buf + 1\u0027, using \u0027len\u0027\nas the length is incorrect because:\n\n1. It causes an out-of-bounds read from \u0027trans-\u003etx_buf\u0027 (which has size\n   \u0027trans-\u003elen\u0027, i.e., \u0027len - 1\u0027 in this context).\n2. It can cause an out-of-bounds write to \u0027ch341-\u003etx_buf\u0027 if \u0027len\u0027 is\n   CH341_PACKET_LENGTH (32). Writing 32 bytes to ch341-\u003etx_buf + 1\n   overflows the buffer.\n\nFix this by copying \u0027len - 1\u0027 bytes.",
  "id": "GHSA-3cw8-5h35-w527",
  "modified": "2026-07-30T06:32:25Z",
  "published": "2025-12-24T12:30:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-68352"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/545d1287e40a55242f6ab68bcc1ba3b74088b1bc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/81841da1f30f66a850cc8796d99ba330aad9d696"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cad6c0fd6f3c0e76a1f75df4bce3b08a13f08974"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ea1e43966cd03098fcd5f0d72e6c2901d45fa08d"
    }
  ],
  "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-2025-68352 (GCVE-0-2025-68352)

Vulnerability from cvelistv5 – Published: 2025-12-24 10:32 – Updated: 2026-08-05 12:11

Title

spi: ch341: fix out-of-bounds memory access in ch341_transfer_one

Summary

In the Linux kernel, the following vulnerability has been resolved: spi: ch341: fix out-of-bounds memory access in ch341_transfer_one Discovered by Atuin - Automated Vulnerability Discovery Engine. The 'len' variable is calculated as 'min(32, trans->len + 1)', which includes the 1-byte command header. When copying data from 'trans->tx_buf' to 'ch341->tx_buf + 1', using 'len' as the length is incorrect because: 1. It causes an out-of-bounds read from 'trans->tx_buf' (which has size 'trans->len', i.e., 'len - 1' in this context). 2. It can cause an out-of-bounds write to 'ch341->tx_buf' if 'len' is CH341_PACKET_LENGTH (32). Writing 32 bytes to ch341->tx_buf + 1 overflows the buffer. Fix this by copying 'len - 1' bytes.

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

References

4 references

URL	Tags
https://git.kernel.org/stable/c/cad6c0fd6f3c0e76a…
https://git.kernel.org/stable/c/ea1e43966cd03098f…
https://git.kernel.org/stable/c/81841da1f30f66a85…
https://git.kernel.org/stable/c/545d1287e40a55242…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 8846739f52afa07e63395c80227dc544f54bd7b1 , < cad6c0fd6f3c0e76a1f75df4bce3b08a13f08974 (git) Affected: 8846739f52afa07e63395c80227dc544f54bd7b1 , < ea1e43966cd03098fcd5f0d72e6c2901d45fa08d (git) Affected: 8846739f52afa07e63395c80227dc544f54bd7b1 , < 81841da1f30f66a850cc8796d99ba330aad9d696 (git) Affected: 8846739f52afa07e63395c80227dc544f54bd7b1 , < 545d1287e40a55242f6ab68bcc1ba3b74088b1bc (git)
Linux	Linux	Affected: 6.11 Unaffected: 0 , < 6.11 (semver) Unaffected: 6.12.63 , ≤ 6.12.* (semver) Unaffected: 6.17.13 , ≤ 6.17.* (semver) Unaffected: 6.18.2 , ≤ 6.18.* (semver) Unaffected: 6.19 , ≤ * (original_commit_for_fix)

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{
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      "affected": [
        {
          "defaultStatus": "unaffected",
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          "programFiles": [
            "drivers/spi/spi-ch341.c"
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          "vendor": "Linux",
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "6.11"
            },
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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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              "version": "6.18.2",
              "versionType": "semver"
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          "nodes": [
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                  "versionEndExcluding": "6.12.63",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
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                },
                {
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              "operator": "OR"
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nspi: ch341: fix out-of-bounds memory access in ch341_transfer_one\n\nDiscovered by Atuin - Automated Vulnerability Discovery Engine.\n\nThe \u0027len\u0027 variable is calculated as \u0027min(32, trans-\u003elen + 1)\u0027,\nwhich includes the 1-byte command header.\n\nWhen copying data from \u0027trans-\u003etx_buf\u0027 to \u0027ch341-\u003etx_buf + 1\u0027, using \u0027len\u0027\nas the length is incorrect because:\n\n1. It causes an out-of-bounds read from \u0027trans-\u003etx_buf\u0027 (which has size\n   \u0027trans-\u003elen\u0027, i.e., \u0027len - 1\u0027 in this context).\n2. It can cause an out-of-bounds write to \u0027ch341-\u003etx_buf\u0027 if \u0027len\u0027 is\n   CH341_PACKET_LENGTH (32). Writing 32 bytes to ch341-\u003etx_buf + 1\n   overflows the buffer.\n\nFix this by copying \u0027len - 1\u0027 bytes."
        }
      ],
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            "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 function is reached through local write or SPI_IOC_MESSAGE operations on a provisioned spidev device. A malicious USB peripheral alone cannot trigger the faulty copy.\nAC:L - A transfer of at least 32 attacker-controlled bytes deterministically produces the one-byte overflow without a race. The attacker controls the overflowing byte and can repeat requests or perform heap grooming.\nPR:L - Binding spidev normally requires administrator provisioning, but the transfer path has no capability check. Once device-node access is granted, an ordinary unprivileged local user can trigger the bug.\nUI:N - The attacker directly opens the device and submits the transfer; no action by another user is required.\nS:U - The vulnerable SPI driver and the affected kernel memory share the same kernel security authority. This is a conventional local kernel privilege-escalation condition rather than a VM or IOMMU boundary escape.\nC:H - The out-of-bounds access can corrupt an adjacent slab object, potentially enabling control-flow hijacking and arbitrary kernel-memory disclosure. Under the required higher-severity treatment of exploitable memory corruption, confidentiality impact is high.\nI:H - For transfers of at least 32 bytes, the attacker controls the byte written beyond ch341-\u003etx_buf. Corruption of adjacent allocator metadata or kernel objects can plausibly yield arbitrary writes or kernel code execution.\nA:H - The adjacent-object corruption can damage allocator metadata or devres list pointers, causing a kernel oops or panic. The triggering transfer can be submitted repeatedly."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:11:00.772Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/ea1e43966cd03098fcd5f0d72e6c2901d45fa08d"
        },
        {
          "url": "https://git.kernel.org/stable/c/81841da1f30f66a850cc8796d99ba330aad9d696"
        },
        {
          "url": "https://git.kernel.org/stable/c/545d1287e40a55242f6ab68bcc1ba3b74088b1bc"
        }
      ],
      "title": "spi: ch341: fix out-of-bounds memory access in ch341_transfer_one",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68352",
    "datePublished": "2025-12-24T10:32:43.366Z",
    "dateReserved": "2025-12-16T14:48:05.300Z",
    "dateUpdated": "2026-08-05T12:11:00.772Z",
    "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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