Vulnerability-Lookup

GHSA-PXPQ-P89V-XX8G

Vulnerability from github – Published: 2026-01-13 18:31 – Updated: 2026-07-30 06:32

Details

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

caif: fix integer underflow in cffrml_receive()

The cffrml_receive() function extracts a length field from the packet header and, when FCS is disabled, subtracts 2 from this length without validating that len >= 2.

If an attacker sends a malicious packet with a length field of 0 or 1 to an interface with FCS disabled, the subtraction causes an integer underflow.

This can lead to memory exhaustion and kernel instability, potential information disclosure if padding contains uninitialized kernel memory.

Fix this by validating that len >= 2 before performing the subtraction.

Severity

8.1 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2025-68799"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-01-13T16:16:01Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncaif: fix integer underflow in cffrml_receive()\n\nThe cffrml_receive() function extracts a length field from the packet\nheader and, when FCS is disabled, subtracts 2 from this length without\nvalidating that len \u003e= 2.\n\nIf an attacker sends a malicious packet with a length field of 0 or 1\nto an interface with FCS disabled, the subtraction causes an integer\nunderflow.\n\nThis can lead to memory exhaustion and kernel instability, potential\ninformation disclosure if padding contains uninitialized kernel memory.\n\nFix this by validating that len \u003e= 2 before performing the subtraction.",
  "id": "GHSA-pxpq-p89v-xx8g",
  "modified": "2026-07-30T06:32:28Z",
  "published": "2026-01-13T18:31:04Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-68799"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/21fdcc00656a60af3c7aae2dea8dd96abd35519c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4ec29714aa4e0601ea29d2f02b461fc0ac92c2c3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/785c7be6361630070790f6235b696da156ac71b3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8a11ff0948b5ad09b71896b7ccc850625f9878d1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c54091eec6fed19e94182aa05dd6846600a642f7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f407f1c9f45bbf5c99fd80b3f3f4a94fdbe35691"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f818cd472565f8b0c2c409b040e0121c5cf8592c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2025-68799 (GCVE-0-2025-68799)

Vulnerability from cvelistv5 – Published: 2026-01-13 15:29 – Updated: 2026-08-05 12:11

Title

caif: fix integer underflow in cffrml_receive()

Summary

In the Linux kernel, the following vulnerability has been resolved: caif: fix integer underflow in cffrml_receive() The cffrml_receive() function extracts a length field from the packet header and, when FCS is disabled, subtracts 2 from this length without validating that len >= 2. If an attacker sends a malicious packet with a length field of 0 or 1 to an interface with FCS disabled, the subtraction causes an integer underflow. This can lead to memory exhaustion and kernel instability, potential information disclosure if padding contains uninitialized kernel memory. Fix this by validating that len >= 2 before performing the subtraction.

Severity

8.1 (High)


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

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7018 records in the last 180 days details

References

7 references

URL	Tags
https://git.kernel.org/stable/c/f407f1c9f45bbf5c9…
https://git.kernel.org/stable/c/c54091eec6fed19e9…
https://git.kernel.org/stable/c/785c7be6361630070…
https://git.kernel.org/stable/c/f818cd472565f8b0c…
https://git.kernel.org/stable/c/4ec29714aa4e0601e…
https://git.kernel.org/stable/c/21fdcc00656a60af3…
https://git.kernel.org/stable/c/8a11ff0948b5ad09b…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: b482cd2053e3b90a7b33a78c63cdb6badf2ec383 , < f407f1c9f45bbf5c99fd80b3f3f4a94fdbe35691 (git) Affected: b482cd2053e3b90a7b33a78c63cdb6badf2ec383 , < c54091eec6fed19e94182aa05dd6846600a642f7 (git) Affected: b482cd2053e3b90a7b33a78c63cdb6badf2ec383 , < 785c7be6361630070790f6235b696da156ac71b3 (git) Affected: b482cd2053e3b90a7b33a78c63cdb6badf2ec383 , < f818cd472565f8b0c2c409b040e0121c5cf8592c (git) Affected: b482cd2053e3b90a7b33a78c63cdb6badf2ec383 , < 4ec29714aa4e0601ea29d2f02b461fc0ac92c2c3 (git) Affected: b482cd2053e3b90a7b33a78c63cdb6badf2ec383 , < 21fdcc00656a60af3c7aae2dea8dd96abd35519c (git) Affected: b482cd2053e3b90a7b33a78c63cdb6badf2ec383 , < 8a11ff0948b5ad09b71896b7ccc850625f9878d1 (git)
Linux	Linux	Affected: 2.6.35 Unaffected: 0 , < 2.6.35 (semver) Unaffected: 5.10.248 , ≤ 5.10.* (semver) Unaffected: 5.15.198 , ≤ 5.15.* (semver) Unaffected: 6.1.160 , ≤ 6.1.* (semver) Unaffected: 6.6.120 , ≤ 6.6.* (semver) Unaffected: 6.12.64 , ≤ 6.12.* (semver) Unaffected: 6.18.3 , ≤ 6.18.* (semver) Unaffected: 6.19 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/caif/cffrml.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "f407f1c9f45bbf5c99fd80b3f3f4a94fdbe35691",
              "status": "affected",
              "version": "b482cd2053e3b90a7b33a78c63cdb6badf2ec383",
              "versionType": "git"
            },
            {
              "lessThan": "c54091eec6fed19e94182aa05dd6846600a642f7",
              "status": "affected",
              "version": "b482cd2053e3b90a7b33a78c63cdb6badf2ec383",
              "versionType": "git"
            },
            {
              "lessThan": "785c7be6361630070790f6235b696da156ac71b3",
              "status": "affected",
              "version": "b482cd2053e3b90a7b33a78c63cdb6badf2ec383",
              "versionType": "git"
            },
            {
              "lessThan": "f818cd472565f8b0c2c409b040e0121c5cf8592c",
              "status": "affected",
              "version": "b482cd2053e3b90a7b33a78c63cdb6badf2ec383",
              "versionType": "git"
            },
            {
              "lessThan": "4ec29714aa4e0601ea29d2f02b461fc0ac92c2c3",
              "status": "affected",
              "version": "b482cd2053e3b90a7b33a78c63cdb6badf2ec383",
              "versionType": "git"
            },
            {
              "lessThan": "21fdcc00656a60af3c7aae2dea8dd96abd35519c",
              "status": "affected",
              "version": "b482cd2053e3b90a7b33a78c63cdb6badf2ec383",
              "versionType": "git"
            },
            {
              "lessThan": "8a11ff0948b5ad09b71896b7ccc850625f9878d1",
              "status": "affected",
              "version": "b482cd2053e3b90a7b33a78c63cdb6badf2ec383",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/caif/cffrml.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.35"
            },
            {
              "lessThan": "2.6.35",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.248",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.198",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.120",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.64",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.248",
                  "versionStartIncluding": "2.6.35",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.198",
                  "versionStartIncluding": "2.6.35",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.160",
                  "versionStartIncluding": "2.6.35",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.120",
                  "versionStartIncluding": "2.6.35",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.64",
                  "versionStartIncluding": "2.6.35",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.3",
                  "versionStartIncluding": "2.6.35",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19",
                  "versionStartIncluding": "2.6.35",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncaif: fix integer underflow in cffrml_receive()\n\nThe cffrml_receive() function extracts a length field from the packet\nheader and, when FCS is disabled, subtracts 2 from this length without\nvalidating that len \u003e= 2.\n\nIf an attacker sends a malicious packet with a length field of 0 or 1\nto an interface with FCS disabled, the subtraction causes an integer\nunderflow.\n\nThis can lead to memory exhaustion and kernel instability, potential\ninformation disclosure if padding contains uninitialized kernel memory.\n\nFix this by validating that len \u003e= 2 before performing the subtraction."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - The malicious CAIF frame originates from a directly connected modem or remote processor over a non-routable USB or virtio link. This makes the attacker logically adjacent rather than an arbitrary Internet host.\nAC:L - A length field of 0 or 1 deterministically triggers the underflow on FCS-disabled USB and virtio interfaces. No race, timing, or uncontrolled memory-layout condition is required.\nPR:N - The framing header is parsed before CAIF channel demultiplexing, authentication, or service-level checks. A malicious CAIF peer requires no Linux credentials or capabilities.\nUI:N - Once the CAIF interface is active, the peer can trigger the vulnerability merely by supplying a malformed frame. No victim action is required.\nS:U - The vulnerable framing code and the affected kernel memory and availability remain within the same kernel security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The underflow can expose approximately 64 KiB of newly allocated, uninitialized kernel heap as skb data, and the fix identifies possible disclosure of this padding. Conservatively, this constitutes a substantial kernel-memory disclosure.\nI:N - The skb helpers allocate sufficient capacity before extending the packet, so the bug does not create an out-of-bounds write, use-after-free, or attacker-controlled overwrite. No integrity impact is established.\nA:H - Each tiny malicious frame can force an approximately 64 KiB atomic skb expansion and unratelimited error logging. Repeated frames can cause memory exhaustion, severe resource pressure, and kernel instability."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:11:33.021Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f407f1c9f45bbf5c99fd80b3f3f4a94fdbe35691"
        },
        {
          "url": "https://git.kernel.org/stable/c/c54091eec6fed19e94182aa05dd6846600a642f7"
        },
        {
          "url": "https://git.kernel.org/stable/c/785c7be6361630070790f6235b696da156ac71b3"
        },
        {
          "url": "https://git.kernel.org/stable/c/f818cd472565f8b0c2c409b040e0121c5cf8592c"
        },
        {
          "url": "https://git.kernel.org/stable/c/4ec29714aa4e0601ea29d2f02b461fc0ac92c2c3"
        },
        {
          "url": "https://git.kernel.org/stable/c/21fdcc00656a60af3c7aae2dea8dd96abd35519c"
        },
        {
          "url": "https://git.kernel.org/stable/c/8a11ff0948b5ad09b71896b7ccc850625f9878d1"
        }
      ],
      "title": "caif: fix integer underflow in cffrml_receive()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68799",
    "datePublished": "2026-01-13T15:29:09.012Z",
    "dateReserved": "2025-12-24T10:30:51.042Z",
    "dateUpdated": "2026-08-05T12:11:33.021Z",
    "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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

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.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted