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

Vulnerability from cvelistv5 – Published: 2026-09-24 16:03 – Updated: 2026-10-03 10:58
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
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 539dda3c5d190c5088b5e57944b1b482fcb464de , < ec41bfd281a8bc8027a42d2674eac5b74947ff7a (git)
Affected: 539dda3c5d190c5088b5e57944b1b482fcb464de , < e07ff2338f45adbf572850335d761c2f97545935 (git)
Affected: 539dda3c5d190c5088b5e57944b1b482fcb464de , < dc626f2abb3052881911b6166a9425739ce80085 (git)
Affected: 539dda3c5d190c5088b5e57944b1b482fcb464de , < abea361a11e4e48695ea149652ef5d3f308b6a49 (git)
Affected: 539dda3c5d190c5088b5e57944b1b482fcb464de , < 5adbc4d02d7df8bd7aa02c21874f7a582a576b55 (git)
Affected: 539dda3c5d190c5088b5e57944b1b482fcb464de , < efc1d92eacf03afa6f4d53bf7120e059b6f961f2 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 5.15.222 , ≤ 5.15.* (semver)
Unaffected: 6.1.189 , ≤ 6.1.* (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.111 , ≤ 6.12.* (semver)
Unaffected: 6.18.53 , ≤ 6.18.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "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": [
            {
              "lessThan": "ec41bfd281a8bc8027a42d2674eac5b74947ff7a",
              "status": "affected",
              "version": "539dda3c5d190c5088b5e57944b1b482fcb464de",
              "versionType": "git"
            },
            {
              "lessThan": "e07ff2338f45adbf572850335d761c2f97545935",
              "status": "affected",
              "version": "539dda3c5d190c5088b5e57944b1b482fcb464de",
              "versionType": "git"
            },
            {
              "lessThan": "dc626f2abb3052881911b6166a9425739ce80085",
              "status": "affected",
              "version": "539dda3c5d190c5088b5e57944b1b482fcb464de",
              "versionType": "git"
            },
            {
              "lessThan": "abea361a11e4e48695ea149652ef5d3f308b6a49",
              "status": "affected",
              "version": "539dda3c5d190c5088b5e57944b1b482fcb464de",
              "versionType": "git"
            },
            {
              "lessThan": "5adbc4d02d7df8bd7aa02c21874f7a582a576b55",
              "status": "affected",
              "version": "539dda3c5d190c5088b5e57944b1b482fcb464de",
              "versionType": "git"
            },
            {
              "lessThan": "efc1d92eacf03afa6f4d53bf7120e059b6f961f2",
              "status": "affected",
              "version": "539dda3c5d190c5088b5e57944b1b482fcb464de",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "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": [
            {
              "status": "affected",
              "version": "5.13"
            },
            {
              "lessThan": "5.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.222",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.189",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.158",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.111",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.53",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
                }
              ],
              "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": "2026-10-03T10:58:20.945Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ec41bfd281a8bc8027a42d2674eac5b74947ff7a"
        },
        {
          "url": "https://git.kernel.org/stable/c/e07ff2338f45adbf572850335d761c2f97545935"
        },
        {
          "url": "https://git.kernel.org/stable/c/dc626f2abb3052881911b6166a9425739ce80085"
        },
        {
          "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",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "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": "2026-10-03T10:58:20.945Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-97436",
      "date": "2026-11-13",
      "epss": "0.00173",
      "percentile": "0.06768"
    },
    "microsoft_vex": {
      "current_release_date": "2026-10-22T01:12:29.000Z",
      "cve": "CVE-2026-97436",
      "id": "msrc_CVE-2026-97436",
      "initial_release_date": "2026-09-28T00:35:10.000Z",
      "product_status:known_not_affected": "1",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "dpaa2-switch: rework FDB management on the bridge leave path",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-97436.json",
      "version": "3"
    },
    "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": [
                  {
                    "lessThan": "ec41bfd281a8bc8027a42d2674eac5b74947ff7a",
                    "status": "affected",
                    "version": "539dda3c5d190c5088b5e57944b1b482fcb464de",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "e07ff2338f45adbf572850335d761c2f97545935",
                    "status": "affected",
                    "version": "539dda3c5d190c5088b5e57944b1b482fcb464de",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "dc626f2abb3052881911b6166a9425739ce80085",
                    "status": "affected",
                    "version": "539dda3c5d190c5088b5e57944b1b482fcb464de",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "abea361a11e4e48695ea149652ef5d3f308b6a49",
                    "status": "affected",
                    "version": "539dda3c5d190c5088b5e57944b1b482fcb464de",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "5adbc4d02d7df8bd7aa02c21874f7a582a576b55",
                    "status": "affected",
                    "version": "539dda3c5d190c5088b5e57944b1b482fcb464de",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "efc1d92eacf03afa6f4d53bf7120e059b6f961f2",
                    "status": "affected",
                    "version": "539dda3c5d190c5088b5e57944b1b482fcb464de",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "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": [
                  {
                    "status": "affected",
                    "version": "5.13"
                  },
                  {
                    "lessThan": "5.13",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.15.*",
                    "status": "unaffected",
                    "version": "5.15.222",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.1.*",
                    "status": "unaffected",
                    "version": "6.1.189",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.6.*",
                    "status": "unaffected",
                    "version": "6.6.158",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.12.*",
                    "status": "unaffected",
                    "version": "6.12.111",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.18.*",
                    "status": "unaffected",
                    "version": "6.18.53",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "7.2",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "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": "2026-10-03T11:17:55.083",
        "metrics": {},
        "published": "2026-09-24T17:17:21.697",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/5adbc4d02d7df8bd7aa02c21874f7a582a576b55"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/abea361a11e4e48695ea149652ef5d3f308b6a49"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/dc626f2abb3052881911b6166a9425739ce80085"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e07ff2338f45adbf572850335d761c2f97545935"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/ec41bfd281a8bc8027a42d2674eac5b74947ff7a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/efc1d92eacf03afa6f4d53bf7120e059b6f961f2"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-11-07T11:29:06+00:00",
      "cve": "CVE-2026-97436",
      "id": "CVE-2026-97436",
      "initial_release_date": "2026-09-24T00:00:00+00:00",
      "product_status:known_affected": "1",
      "product_status:known_not_affected": "202",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: dpaa2-switch: rework FDB management on the bridge leave path",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97436.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "low",
      "current_release_date": "2026-10-27T18:09:08Z",
      "cve": "CVE-2026-97436",
      "id": "CVE-2026-97436",
      "initial_release_date": "2026-09-24T23:46:05Z",
      "product_status:known_affected": "163",
      "product_status:known_not_affected": "185",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-97436",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-97436.json",
      "version": "5"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.
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.

Loading timeline…




    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.