Vulnerability-Lookup

GHSA-85CH-F4P7-JJ7H

Vulnerability from github – Published: 2025-12-07 00:30 – Updated: 2025-12-07 00:30

Details

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

net: sched: act_connmark: initialize struct tc_ife to fix kernel leak

In tcf_connmark_dump(), the variable 'opt' was partially initialized using a designatied initializer. While the padding bytes are reamined uninitialized. nla_put() copies the entire structure into a netlink message, these uninitialized bytes leaked to userspace.

Initialize the structure with memset before assigning its fields to ensure all members and padding are cleared prior to beign copied.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-40279"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-06T22:15:55Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: sched: act_connmark: initialize struct tc_ife to fix kernel leak\n\nIn tcf_connmark_dump(), the variable \u0027opt\u0027 was partially initialized using a\ndesignatied initializer. While the padding bytes are reamined\nuninitialized. nla_put() copies the entire structure into a\nnetlink message, these uninitialized bytes leaked to userspace.\n\nInitialize the structure with memset before assigning its fields\nto ensure all members and padding are cleared prior to beign copied.",
  "id": "GHSA-85ch-f4p7-jj7h",
  "modified": "2025-12-07T00:30:56Z",
  "published": "2025-12-07T00:30:56Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40279"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/218b67c8c8246d47a2a7910eae80abe4861fe2b7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/25837889ec062f2b7618142cd80253dff3da5343"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/31e4aa93e2e5b5647fc235b0f6ee329646878f9e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/51cb05d4fd632596816ba44e882e84db9fb28a7e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/62b656e43eaeae445a39cd8021a4f47065af4389"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/73cc56c608c209d3d666cc571293b090a471da70"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2025-40279 (GCVE-0-2025-40279)

Vulnerability from cvelistv5 – Published: 2025-12-06 21:51 – Updated: 2026-05-11 21:46

Title

net: sched: act_connmark: initialize struct tc_ife to fix kernel leak

Summary

In the Linux kernel, the following vulnerability has been resolved: net: sched: act_connmark: initialize struct tc_ife to fix kernel leak In tcf_connmark_dump(), the variable 'opt' was partially initialized using a designatied initializer. While the padding bytes are reamined uninitialized. nla_put() copies the entire structure into a netlink message, these uninitialized bytes leaked to userspace. Initialize the structure with memset before assigning its fields to ensure all members and padding are cleared prior to beign copied.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

6 references

URL	Tags
https://git.kernel.org/stable/c/218b67c8c8246d47a…
https://git.kernel.org/stable/c/73cc56c608c209d3d…
https://git.kernel.org/stable/c/31e4aa93e2e5b5647…
https://git.kernel.org/stable/c/51cb05d4fd6325968…
https://git.kernel.org/stable/c/25837889ec062f2b7…
https://git.kernel.org/stable/c/62b656e43eaeae445…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 22a5dc0e5e3e8fef804230cd73ed7b0afd4c7bae , < 218b67c8c8246d47a2a7910eae80abe4861fe2b7 (git) Affected: 22a5dc0e5e3e8fef804230cd73ed7b0afd4c7bae , < 73cc56c608c209d3d666cc571293b090a471da70 (git) Affected: 22a5dc0e5e3e8fef804230cd73ed7b0afd4c7bae , < 31e4aa93e2e5b5647fc235b0f6ee329646878f9e (git) Affected: 22a5dc0e5e3e8fef804230cd73ed7b0afd4c7bae , < 51cb05d4fd632596816ba44e882e84db9fb28a7e (git) Affected: 22a5dc0e5e3e8fef804230cd73ed7b0afd4c7bae , < 25837889ec062f2b7618142cd80253dff3da5343 (git) Affected: 22a5dc0e5e3e8fef804230cd73ed7b0afd4c7bae , < 62b656e43eaeae445a39cd8021a4f47065af4389 (git)
Linux	Linux	Affected: 4.0 Unaffected: 0 , < 4.0 (semver) Unaffected: 5.15.197 , ≤ 5.15.* (semver) Unaffected: 6.1.159 , ≤ 6.1.* (semver) Unaffected: 6.6.117 , ≤ 6.6.* (semver) Unaffected: 6.12.59 , ≤ 6.12.* (semver) Unaffected: 6.17.9 , ≤ 6.17.* (semver) Unaffected: 6.18 , ≤ * (original_commit_for_fix)

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{
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        {
          "defaultStatus": "unaffected",
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          "programFiles": [
            "net/sched/act_connmark.c"
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          "versions": [
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              "version": "4.0"
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              "version": "0",
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              "versionType": "semver"
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              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.117",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.59",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
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          "nodes": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: sched: act_connmark: initialize struct tc_ife to fix kernel leak\n\nIn tcf_connmark_dump(), the variable \u0027opt\u0027 was partially initialized using a\ndesignatied initializer. While the padding bytes are reamined\nuninitialized. nla_put() copies the entire structure into a\nnetlink message, these uninitialized bytes leaked to userspace.\n\nInitialize the structure with memset before assigning its fields\nto ensure all members and padding are cleared prior to beign copied."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:46:16.602Z",
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          "url": "https://git.kernel.org/stable/c/73cc56c608c209d3d666cc571293b090a471da70"
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        },
        {
          "url": "https://git.kernel.org/stable/c/62b656e43eaeae445a39cd8021a4f47065af4389"
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    "cveId": "CVE-2025-40279",
    "datePublished": "2025-12-06T21:51:03.010Z",
    "dateReserved": "2025-04-16T07:20:57.184Z",
    "dateUpdated": "2026-05-11T21:46:16.602Z",
    "state": "PUBLISHED"
  },
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  "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.

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.