CVE-2024-40921 (GCVE-0-2024-40921)

Vulnerability from cvelistv5 – Published: 2024-07-12 12:25 – Updated: 2026-05-23 15:51
VLAI
Title
net: bridge: mst: pass vlan group directly to br_mst_vlan_set_state
Summary
In the Linux kernel, the following vulnerability has been resolved: net: bridge: mst: pass vlan group directly to br_mst_vlan_set_state Pass the already obtained vlan group pointer to br_mst_vlan_set_state() instead of dereferencing it again. Each caller has already correctly dereferenced it for their context. This change is required for the following suspicious RCU dereference fix. No functional changes intended.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 17:05 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6638 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8ca9a750fc711911ef616ceb627d07357b04545e , < 09f4337c27f5bdeb8646a6db91488cc2f7d537ff (git)
Affected: 4488617e5e995a09abe4d81add5fb165674edb59 , < a6cc9e9a651b9861efa068c164ee62dfba68c6ca (git)
Affected: e43dd2b1ec746e105b7db5f9ad6ef14685a615a4 , < d2dc02775fc0c4eacaee833a0637e5958884a8e5 (git)
Affected: 3a7c1661ae1383364cd6092d851f5e5da64d476b , < 36c92936e868601fa1f43da6758cf55805043509 (git)
Affected: a2b01e65d9ba8af2bb086d3b7288ca53a07249ac (git)
Affected: 6.8.12 , < 6.9 (semver)
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Linux Linux Affected: 6.1.93 , < 6.1.95 (semver)
Affected: 6.6.33 , < 6.6.35 (semver)
Affected: 6.9.3 , < 6.9.6 (semver)
guessed Create a notification for this product.
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "09f4337c27f5bdeb8646a6db91488cc2f7d537ff",
                  "status": "affected",
                  "version": "8ca9a750fc711911ef616ceb627d07357b04545e",
                  "versionType": "git"
                },
                {
                  "lessThan": "a6cc9e9a651b9861efa068c164ee62dfba68c6ca",
                  "status": "affected",
                  "version": "4488617e5e995a09abe4d81add5fb165674edb59",
                  "versionType": "git"
                },
                {
                  "lessThan": "d2dc02775fc0c4eacaee833a0637e5958884a8e5",
                  "status": "affected",
                  "version": "e43dd2b1ec746e105b7db5f9ad6ef14685a615a4",
                  "versionType": "git"
                },
                {
                  "lessThan": "36c92936e868601fa1f43da6758cf55805043509",
                  "status": "affected",
                  "version": "3a7c1661ae1383364cd6092d851f5e5da64d476b",
                  "versionType": "git"
                },
                {
                  "status": "affected",
                  "version": "a2b01e65d9ba8af2bb086d3b7288ca53a07249ac",
                  "versionType": "git"
                },
                {
                  "lessThan": "6.9",
                  "status": "affected",
                  "version": "6.8.12",
                  "versionType": "semver"
                }
              ]
            },
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "net/bridge/br_mst.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "6.1.95",
                  "status": "affected",
                  "version": "6.1.93",
                  "versionType": "semver"
                },
                {
                  "lessThan": "6.6.35",
                  "status": "affected",
                  "version": "6.6.33",
                  "versionType": "semver"
                },
                {
                  "lessThan": "6.9.6",
                  "status": "affected",
                  "version": "6.9.3",
                  "versionType": "semver"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.95",
                      "versionStartIncluding": "6.1.93",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.35",
                      "versionStartIncluding": "6.6.33",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.9.6",
                      "versionStartIncluding": "6.9.3",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionStartIncluding": "6.8.12",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bridge: mst: pass vlan group directly to br_mst_vlan_set_state\n\nPass the already obtained vlan group pointer to br_mst_vlan_set_state()\ninstead of dereferencing it again. Each caller has already correctly\ndereferenced it for their context. This change is required for the\nfollowing suspicious RCU dereference fix. No functional changes\nintended."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-05-23T15:51:04.404Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/09f4337c27f5bdeb8646a6db91488cc2f7d537ff"
            },
            {
              "url": "https://git.kernel.org/stable/c/a6cc9e9a651b9861efa068c164ee62dfba68c6ca"
            },
            {
              "url": "https://git.kernel.org/stable/c/d2dc02775fc0c4eacaee833a0637e5958884a8e5"
            },
            {
              "url": "https://git.kernel.org/stable/c/36c92936e868601fa1f43da6758cf55805043509"
            }
          ],
          "title": "net: bridge: mst: pass vlan group directly to br_mst_vlan_set_state",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-40921",
        "datePublished": "2024-07-12T12:25:02.907Z",
        "dateReserved": "2024-07-12T12:17:45.582Z",
        "dateUpdated": "2026-05-23T15:51:04.404Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Sightings

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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

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    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.