Vulnerability-Lookup

GHSA-F9WM-PPG2-PC92

Vulnerability from github – Published: 2025-10-01 09:30 – Updated: 2025-12-11 18:30

Details

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

genetlink: fix genl_bind() invoking bind() after -EPERM

Per family bind/unbind callbacks were introduced to allow families to track multicast group consumer presence, e.g. to start or stop producing events depending on listeners.

However, in genl_bind() the bind() callback was invoked even if capability checks failed and ret was set to -EPERM. This means that callbacks could run on behalf of unauthorized callers while the syscall still returned failure to user space.

Fix this by only invoking bind() after "if (ret) break;" check i.e. after permission checks have succeeded.

Severity

5.5 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2025-39926"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-10-01T08:15:35Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ngenetlink: fix genl_bind() invoking bind() after -EPERM\n\nPer family bind/unbind callbacks were introduced to allow families\nto track multicast group consumer presence, e.g. to start or stop\nproducing events depending on listeners.\n\nHowever, in genl_bind() the bind() callback was invoked even if\ncapability checks failed and ret was set to -EPERM. This means that\ncallbacks could run on behalf of unauthorized callers while the\nsyscall still returned failure to user space.\n\nFix this by only invoking bind() after \"if (ret) break;\" check\ni.e. after permission checks have succeeded.",
  "id": "GHSA-f9wm-ppg2-pc92",
  "modified": "2025-12-11T18:30:35Z",
  "published": "2025-10-01T09:30:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39926"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1dbfb0363224f6da56f6655d596dc5097308d6f5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8858c1e9405906c09589d7c336f04058ea198207"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/98c9d884047a3051c203708914a874dece3cbe54"
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  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2025-39926 (GCVE-0-2025-39926)

Vulnerability from cvelistv5 – Published: 2025-10-01 08:07 – Updated: 2026-05-11 21:39

Title

genetlink: fix genl_bind() invoking bind() after -EPERM

Summary

In the Linux kernel, the following vulnerability has been resolved: genetlink: fix genl_bind() invoking bind() after -EPERM Per family bind/unbind callbacks were introduced to allow families to track multicast group consumer presence, e.g. to start or stop producing events depending on listeners. However, in genl_bind() the bind() callback was invoked even if capability checks failed and ret was set to -EPERM. This means that callbacks could run on behalf of unauthorized callers while the syscall still returned failure to user space. Fix this by only invoking bind() after "if (ret) break;" check i.e. after permission checks have succeeded.

Severity

5.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-01-14 17:39 UTC

CWE

CWE-noinfo Not enough information

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/98c9d884047a3051c…
https://git.kernel.org/stable/c/8858c1e9405906c09…
https://git.kernel.org/stable/c/1dbfb0363224f6da5…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 3de21a8990d3c2cc507e9cc4ed00f36358d5b93e , < 98c9d884047a3051c203708914a874dece3cbe54 (git) Affected: 3de21a8990d3c2cc507e9cc4ed00f36358d5b93e , < 8858c1e9405906c09589d7c336f04058ea198207 (git) Affected: 3de21a8990d3c2cc507e9cc4ed00f36358d5b93e , < 1dbfb0363224f6da56f6655d596dc5097308d6f5 (git)
Linux	Linux	Affected: 6.9 Unaffected: 0 , < 6.9 (semver) Unaffected: 6.12.48 , ≤ 6.12.* (semver) Unaffected: 6.16.8 , ≤ 6.16.* (semver) Unaffected: 6.17 , ≤ * (original_commit_for_fix)

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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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