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

Vulnerability from cvelistv5 – Published: 2025-10-01 08:07 – Updated: 2026-05-11 21:39
VLAI
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
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6665 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3de21a8990d3c2cc507e9cc4ed00f36358d5b93e , < 98c9d884047a3051c203708914a874dece3cbe54 (git)
Affected: 3de21a8990d3c2cc507e9cc4ed00f36358d5b93e , < 8858c1e9405906c09589d7c336f04058ea198207 (git)
Affected: 3de21a8990d3c2cc507e9cc4ed00f36358d5b93e , < 1dbfb0363224f6da56f6655d596dc5097308d6f5 (git)
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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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Show details on NVD website
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              "value": "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."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2025-10-01T08:07:13.883Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/98c9d884047a3051c203708914a874dece3cbe54"
            },
            {
              "url": "https://git.kernel.org/stable/c/8858c1e9405906c09589d7c336f04058ea198207"
            },
            {
              "url": "https://git.kernel.org/stable/c/1dbfb0363224f6da56f6655d596dc5097308d6f5"
            }
          ],
          "title": "genetlink: fix genl_bind() invoking bind() after -EPERM",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2025-39926",
        "datePublished": "2025-10-01T08:07:13.883Z",
        "dateReserved": "2025-04-16T07:20:57.147Z",
        "dateUpdated": "2026-01-14T17:42:45.424Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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