CVE-2026-23440 (GCVE-0-2026-23440)

Vulnerability from cvelistv5 – Published: 2026-04-03 15:15 – Updated: 2026-08-05 12:21
VLAI
Title
net/mlx5e: Fix race condition during IPSec ESN update
Summary
In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: Fix race condition during IPSec ESN update In IPSec full offload mode, the device reports an ESN (Extended Sequence Number) wrap event to the driver. The driver validates this event by querying the IPSec ASO and checking that the esn_event_arm field is 0x0, which indicates an event has occurred. After handling the event, the driver must re-arm the context by setting esn_event_arm back to 0x1. A race condition exists in this handling path. After validating the event, the driver calls mlx5_accel_esp_modify_xfrm() to update the kernel's xfrm state. This function temporarily releases and re-acquires the xfrm state lock. So, need to acknowledge the event first by setting esn_event_arm to 0x1. This prevents the driver from reprocessing the same ESN update if the hardware sends events for other reason. Since the next ESN update only occurs after nearly 2^31 packets are received, there's no risk of missing an update, as it will happen long after this handling has finished. Processing the event twice causes the ESN high-order bits (esn_msb) to be incremented incorrectly. The driver then programs the hardware with this invalid ESN state, which leads to anti-replay failures and a complete halt of IPSec traffic. Fix this by re-arming the ESN event immediately after it is validated, before calling mlx5_accel_esp_modify_xfrm(). This ensures that any spurious, duplicate events are correctly ignored, closing the race window.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: fef06678931ff67b158d337b581e5cf5ca40a3a3 , < 3dffc083292e6872787bd7e34b957627622f9af4 (git)
Affected: fef06678931ff67b158d337b581e5cf5ca40a3a3 , < 2051c709dce92da3550040aa7949cd5a9c89b14e (git)
Affected: fef06678931ff67b158d337b581e5cf5ca40a3a3 , < 96c9c25b74686ac2de15921c9ad30c5ef13af8cd (git)
Affected: fef06678931ff67b158d337b581e5cf5ca40a3a3 , < 8d625c15471fb8780125eaef682983a96af77bdc (git)
Affected: fef06678931ff67b158d337b581e5cf5ca40a3a3 , < beb6e2e5976a128b0cccf10d158124422210c5ef (git)
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Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.78 , ≤ 6.12.* (semver)
Unaffected: 6.18.20 , ≤ 6.18.* (semver)
Unaffected: 6.19.10 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet/mlx5e: Corrige condici\u00f3n de carrera durante la actualizaci\u00f3n de ESN de IPSec\n\nEn modo de descarga completa de IPSec, el dispositivo informa un evento de envoltura de ESN (N\u00famero de Secuencia Extendido) al controlador. El controlador valida este evento consultando el ASO de IPSec y verificando que el campo esn_event_arm sea 0x0, lo que indica que ha ocurrido un evento. Despu\u00e9s de manejar el evento, el controlador debe rearmar el contexto estableciendo esn_event_arm de nuevo a 0x1.\n\nExiste una condici\u00f3n de carrera en esta ruta de manejo. Despu\u00e9s de validar el evento, el controlador llama a mlx5_accel_esp_modify_xfrm() para actualizar el estado xfrm del kernel. Esta funci\u00f3n libera temporalmente y vuelve a adquirir el bloqueo de estado xfrm.\n\nPor lo tanto, es necesario reconocer el evento primero estableciendo esn_event_arm en 0x1. Esto evita que el controlador reprocese la misma actualizaci\u00f3n de ESN si el hardware env\u00eda eventos por otra raz\u00f3n. Dado que la pr\u00f3xima actualizaci\u00f3n de ESN solo ocurre despu\u00e9s de que se reciben casi 2^31 paquetes, no hay riesgo de perder una actualizaci\u00f3n, ya que ocurrir\u00e1 mucho despu\u00e9s de que este manejo haya terminado.\n\nProcesar el evento dos veces hace que los bits de orden superior de ESN (esn_msb) se incrementen incorrectamente. El controlador luego programa el hardware con este estado ESN inv\u00e1lido, lo que lleva a fallos de anti-replay y una detenci\u00f3n completa del tr\u00e1fico IPSec.\n\nSolucione esto rearmando el evento ESN inmediatamente despu\u00e9s de que sea validado, antes de llamar a mlx5_accel_esp_modify_xfrm(). Esto asegura que cualquier evento espurio o duplicado sea correctamente ignorado, cerrando la ventana de carrera."
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        "id": "CVE-2026-23440",
        "lastModified": "2026-07-24T21:10:00.143",
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                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.0,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2026-04-03T16:16:26.020",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/2051c709dce92da3550040aa7949cd5a9c89b14e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/3dffc083292e6872787bd7e34b957627622f9af4"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/8d625c15471fb8780125eaef682983a96af77bdc"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/96c9c25b74686ac2de15921c9ad30c5ef13af8cd"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/beb6e2e5976a128b0cccf10d158124422210c5ef"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-362"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T11:45:53+00:00",
      "cve": "CVE-2026-23440",
      "id": "CVE-2026-23440",
      "initial_release_date": "2026-04-03T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/mlx5e: Fix race condition during IPSec ESN update",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23440.json",
      "version": "3"
    }
  }
}



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Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.


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.