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CVE-2021-47199 (GCVE-0-2021-47199)

Vulnerability from cvelistv5 – Published: 2024-04-10 18:56 – Updated: 2026-05-11 13:49
VLAI
Title
net/mlx5e: CT, Fix multiple allocations and memleak of mod acts
Summary
In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: CT, Fix multiple allocations and memleak of mod acts CT clear action offload adds additional mod hdr actions to the flow's original mod actions in order to clear the registers which hold ct_state. When such flow also includes encap action, a neigh update event can cause the driver to unoffload the flow and then reoffload it. Each time this happens, the ct clear handling adds that same set of mod hdr actions to reset ct_state until the max of mod hdr actions is reached. Also the driver never releases the allocated mod hdr actions and causing a memleak. Fix above two issues by moving CT clear mod acts allocation into the parsing actions phase and only use it when offloading the rule. The release of mod acts will be done in the normal flow_put(). backtrace: [<000000007316e2f3>] krealloc+0x83/0xd0 [<00000000ef157de1>] mlx5e_mod_hdr_alloc+0x147/0x300 [mlx5_core] [<00000000970ce4ae>] mlx5e_tc_match_to_reg_set_and_get_id+0xd7/0x240 [mlx5_core] [<0000000067c5fa17>] mlx5e_tc_match_to_reg_set+0xa/0x20 [mlx5_core] [<00000000d032eb98>] mlx5_tc_ct_entry_set_registers.isra.0+0x36/0xc0 [mlx5_core] [<00000000fd23b869>] mlx5_tc_ct_flow_offload+0x272/0x1f10 [mlx5_core] [<000000004fc24acc>] mlx5e_tc_offload_fdb_rules.part.0+0x150/0x620 [mlx5_core] [<00000000dc741c17>] mlx5e_tc_encap_flows_add+0x489/0x690 [mlx5_core] [<00000000e92e49d7>] mlx5e_rep_update_flows+0x6e4/0x9b0 [mlx5_core] [<00000000f60f5602>] mlx5e_rep_neigh_update+0x39a/0x5d0 [mlx5_core]
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 15:50 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1ef3018f5af3da6376fae546e4dfc3f05f063815 , < 486e8de6e233ff2999493533c6259d1cb538653b (git)
Affected: 1ef3018f5af3da6376fae546e4dfc3f05f063815 , < 806401c20a0f9c51b6c8fd7035671e6ca841f6c2 (git)
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Linux Linux Affected: 5.7
Unaffected: 0 , < 5.7 (semver)
Unaffected: 5.15.5 , ≤ 5.15.* (semver)
Unaffected: 5.16 , ≤ * (original_commit_for_fix)
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            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/mlx5e: CT, corrige asignaciones m\u00faltiples y fuga de memoria de actos mod La descarga de la acci\u00f3n CT clear agrega acciones mod hdr adicionales a las acciones mod originales del flujo para borrar los registros que contienen ct_state. Cuando dicho flujo tambi\u00e9n incluye la acci\u00f3n encap, un evento de actualizaci\u00f3n vecinal puede hacer que el controlador descargue el flujo y luego lo vuelva a descargar. Cada vez que esto sucede, el manejo de ct clear agrega ese mismo conjunto de acciones mod hdr para restablecer ct_state hasta que se alcanza el m\u00e1ximo de acciones mod hdr. Adem\u00e1s, el controlador nunca libera las acciones mod hdr asignadas y causa una fuga de memoria. Corrija los dos problemas anteriores moviendo la asignaci\u00f3n de actos mod de CT clear a la fase de acciones de an\u00e1lisis y solo \u00faselo al descargar la regla. La liberaci\u00f3n de actos mod se realizar\u00e1 en el flow_put() normal. seguimiento inverso: [\u0026lt;000000007316e2f3\u0026gt;] krealloc+0x83/0xd0 [\u0026lt;00000000ef157de1\u0026gt;] mlx5e_mod_hdr_alloc+0x147/0x300 [mlx5_core] [\u0026lt;00000000970ce4ae\u0026gt;] mlx5e_tc_match_to_reg_set_and_get_id+0xd7/0x240 [mlx5_core] [\u0026lt;0000000067c5fa17\u0026gt;] mlx5e_tc_match_to_reg_set+0xa/0x20 [mlx5_core] [\u0026lt;00000000d032eb98\u0026gt;] mlx5_tc_ct_entry_set_registers.isra.0+0x36/0xc0 [mlx5_core] [\u0026lt;00000000fd23b869\u0026gt;] mlx5_tc_ct_flow_offload+0x272/0x1f10 [mlx5_core] [\u0026lt;000000004fc24acc\u0026gt;] mlx5e_tc_offload_fdb_rules.part.0+0x150/0x620 [mlx5_core] [\u0026lt;00000000dc741c17\u0026gt;] mlx5e_tc_encap_flows_add+0x489/0x690 [mlx5_core] [\u0026lt;00000000e92e49d7\u0026gt;] mlx5e_rep_actualizaci\u00f3n_flujos+0x6e4/0x9b0 [mlx5_core] [\u0026lt;00000000f60f5602\u0026gt;] mlx5e_rep_neigh_actualizaci\u00f3n+0x39a/0x5d0 [mlx5_core]"
          }
        ],
        "id": "CVE-2021-47199",
        "lastModified": "2026-06-17T04:16:53.560",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2021-47199",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T15:50:01.719714Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2024-04-10T19:15:48.037",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/486e8de6e233ff2999493533c6259d1cb538653b"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
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            "url": "https://git.kernel.org/stable/c/806401c20a0f9c51b6c8fd7035671e6ca841f6c2"
          },
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            "tags": [
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          },
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            "url": "https://git.kernel.org/stable/c/806401c20a0f9c51b6c8fd7035671e6ca841f6c2"
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        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-401"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2025-11-21T14:02:32+00:00",
      "cve": "CVE-2021-47199",
      "id": "CVE-2021-47199",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/mlx5e: CT, Fix multiple allocations and memleak of mod acts",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47199.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-04T00:43:27Z",
      "cve": "CVE-2021-47199",
      "id": "CVE-2021-47199",
      "initial_release_date": "2024-04-15T23:20:43Z",
      "product_status:known_affected": "311",
      "product_status:known_not_affected": "247",
      "product_status:recommended": "462",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-47199",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47199.json",
      "version": "47"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "providerMetadata": {
              "dateUpdated": "2024-08-04T05:32:07.447Z",
              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
              "shortName": "CVE"
            },
            "references": [
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://git.kernel.org/stable/c/486e8de6e233ff2999493533c6259d1cb538653b"
              },
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://git.kernel.org/stable/c/806401c20a0f9c51b6c8fd7035671e6ca841f6c2"
              }
            ],
            "title": "CVE Program Container"
          },
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2021-47199",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2024-09-10T15:50:01.719714Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
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              }
            ],
            "providerMetadata": {
              "dateUpdated": "2024-09-11T12:42:17.754Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.c",
                "drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.h",
                "drivers/net/ethernet/mellanox/mlx5/core/en_tc.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "486e8de6e233ff2999493533c6259d1cb538653b",
                  "status": "affected",
                  "version": "1ef3018f5af3da6376fae546e4dfc3f05f063815",
                  "versionType": "git"
                },
                {
                  "lessThan": "806401c20a0f9c51b6c8fd7035671e6ca841f6c2",
                  "status": "affected",
                  "version": "1ef3018f5af3da6376fae546e4dfc3f05f063815",
                  "versionType": "git"
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              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.c",
                "drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.h",
                "drivers/net/ethernet/mellanox/mlx5/core/en_tc.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "5.7"
                },
                {
                  "lessThan": "5.7",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.5",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "5.16",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.5",
                      "versionStartIncluding": "5.7",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.16",
                      "versionStartIncluding": "5.7",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: CT, Fix multiple allocations and memleak of mod acts\n\nCT clear action offload adds additional mod hdr actions to the\nflow\u0027s original mod actions in order to clear the registers which\nhold ct_state.\nWhen such flow also includes encap action, a neigh update event\ncan cause the driver to unoffload the flow and then reoffload it.\n\nEach time this happens, the ct clear handling adds that same set\nof mod hdr actions to reset ct_state until the max of mod hdr\nactions is reached.\n\nAlso the driver never releases the allocated mod hdr actions and\ncausing a memleak.\n\nFix above two issues by moving CT clear mod acts allocation\ninto the parsing actions phase and only use it when offloading the rule.\nThe release of mod acts will be done in the normal flow_put().\n\n backtrace:\n    [\u003c000000007316e2f3\u003e] krealloc+0x83/0xd0\n    [\u003c00000000ef157de1\u003e] mlx5e_mod_hdr_alloc+0x147/0x300 [mlx5_core]\n    [\u003c00000000970ce4ae\u003e] mlx5e_tc_match_to_reg_set_and_get_id+0xd7/0x240 [mlx5_core]\n    [\u003c0000000067c5fa17\u003e] mlx5e_tc_match_to_reg_set+0xa/0x20 [mlx5_core]\n    [\u003c00000000d032eb98\u003e] mlx5_tc_ct_entry_set_registers.isra.0+0x36/0xc0 [mlx5_core]\n    [\u003c00000000fd23b869\u003e] mlx5_tc_ct_flow_offload+0x272/0x1f10 [mlx5_core]\n    [\u003c000000004fc24acc\u003e] mlx5e_tc_offload_fdb_rules.part.0+0x150/0x620 [mlx5_core]\n    [\u003c00000000dc741c17\u003e] mlx5e_tc_encap_flows_add+0x489/0x690 [mlx5_core]\n    [\u003c00000000e92e49d7\u003e] mlx5e_rep_update_flows+0x6e4/0x9b0 [mlx5_core]\n    [\u003c00000000f60f5602\u003e] mlx5e_rep_neigh_update+0x39a/0x5d0 [mlx5_core]"
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2025-05-04T07:06:14.321Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/486e8de6e233ff2999493533c6259d1cb538653b"
            },
            {
              "url": "https://git.kernel.org/stable/c/806401c20a0f9c51b6c8fd7035671e6ca841f6c2"
            }
          ],
          "title": "net/mlx5e: CT, Fix multiple allocations and memleak of mod acts",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2021-47199",
        "datePublished": "2024-04-10T18:56:34.529Z",
        "dateReserved": "2024-03-25T09:12:14.117Z",
        "dateUpdated": "2025-05-04T07:06:14.321Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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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

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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.


Detection rules are retrieved from Rulezet.


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