CVE-2026-97436 (GCVE-0-2026-97436)

Vulnerability from cvelistv5 – Published: 2026-09-24 16:03 – Updated: 2026-09-25 12:44
VLAI
Title
dpaa2-switch: rework FDB management on the bridge leave path
Summary
In the Linux kernel, the following vulnerability has been resolved: dpaa2-switch: rework FDB management on the bridge leave path On bridge leave, the dpaa2_switch_port_set_fdb() function always allocates a new FDB for the port which is becoming standalone. In case no FDB is found, then the port leaving a bridge will continue to use the current one. The above logic does not cover the case in which there are multiple bridges which have ports from the same DPSW instance. In this case, when the last port leaves bridge #1, it finds an unused FDB to switch to, but the old FDB is not marked as unused. Since the number of FDBs is equal to the number of DPSW interfaces, this will eventually lead to multiple ports sharing the same FDB. Fix this by changing how we are managing the FDBs on the leave path. Instead of directly allocating a new FDB, first verify if the current port is the last one to leave a bridge. If this is the case, then continue to use the current FDB and only allocate another FDB if there are other ports remaining in the bridge.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 539dda3c5d190c5088b5e57944b1b482fcb464de , < abea361a11e4e48695ea149652ef5d3f308b6a49 (git)
Affected: 539dda3c5d190c5088b5e57944b1b482fcb464de , < 5adbc4d02d7df8bd7aa02c21874f7a582a576b55 (git)
Affected: 539dda3c5d190c5088b5e57944b1b482fcb464de , < efc1d92eacf03afa6f4d53bf7120e059b6f961f2 (git)
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Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 6.12.111 , ≤ 6.12.* (semver)
Unaffected: 6.18.53 , ≤ 6.18.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c"
          ],
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              "versionType": "semver"
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                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndpaa2-switch: rework FDB management on the bridge leave path\n\nOn bridge leave, the dpaa2_switch_port_set_fdb() function always\nallocates a new FDB for the port which is becoming standalone. In case\nno FDB is found, then the port leaving a bridge will continue to use the\ncurrent one.\n\nThe above logic does not cover the case in which there are multiple\nbridges which have ports from the same DPSW instance. In this case, when\nthe last port leaves bridge #1, it finds an unused FDB to switch to, but\nthe old FDB is not marked as unused. Since the number of FDBs is equal\nto the number of DPSW interfaces, this will eventually lead to multiple\nports sharing the same FDB.\n\nFix this by changing how we are managing the FDBs on the leave path.\nInstead of directly allocating a new FDB, first verify if the current\nport is the last one to leave a bridge. If this is the case, then\ncontinue to use the current FDB and only allocate another FDB if there\nare other ports remaining in the bridge."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-25T12:44:13.262Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/abea361a11e4e48695ea149652ef5d3f308b6a49"
        },
        {
          "url": "https://git.kernel.org/stable/c/5adbc4d02d7df8bd7aa02c21874f7a582a576b55"
        },
        {
          "url": "https://git.kernel.org/stable/c/efc1d92eacf03afa6f4d53bf7120e059b6f961f2"
        }
      ],
      "title": "dpaa2-switch: rework FDB management on the bridge leave path",
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-97436",
    "datePublished": "2026-09-24T16:03:49.183Z",
    "dateReserved": "2026-09-24T14:53:16.869Z",
    "dateUpdated": "2026-09-25T12:44:13.262Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-09-25",
      "epss": "0.00166",
      "percentile": "0.0519"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
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                ],
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                "vendor": "Linux",
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                  },
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                    "versionType": "semver"
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                    "status": "unaffected",
                    "version": "6.18.53",
                    "versionType": "semver"
                  },
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                ]
              }
            ],
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          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndpaa2-switch: rework FDB management on the bridge leave path\n\nOn bridge leave, the dpaa2_switch_port_set_fdb() function always\nallocates a new FDB for the port which is becoming standalone. In case\nno FDB is found, then the port leaving a bridge will continue to use the\ncurrent one.\n\nThe above logic does not cover the case in which there are multiple\nbridges which have ports from the same DPSW instance. In this case, when\nthe last port leaves bridge #1, it finds an unused FDB to switch to, but\nthe old FDB is not marked as unused. Since the number of FDBs is equal\nto the number of DPSW interfaces, this will eventually lead to multiple\nports sharing the same FDB.\n\nFix this by changing how we are managing the FDBs on the leave path.\nInstead of directly allocating a new FDB, first verify if the current\nport is the last one to leave a bridge. If this is the case, then\ncontinue to use the current FDB and only allocate another FDB if there\nare other ports remaining in the bridge."
          }
        ],
        "id": "CVE-2026-97436",
        "lastModified": "2026-09-25T13:17:27.210",
        "metrics": {},
        "published": "2026-09-24T17:17:21.697",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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            "url": "https://git.kernel.org/stable/c/efc1d92eacf03afa6f4d53bf7120e059b6f961f2"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-09-24T23:46:05Z",
      "cve": "CVE-2026-97436",
      "id": "CVE-2026-97436",
      "initial_release_date": "2026-09-24T23:46:05Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-97436",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-97436.json",
      "version": "2"
    }
  }
}



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