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CVE-2022-49539

Estado: AnalizadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

rtw89: ser: fix CAM leaks occurring in L2 reset

The CAM, meaning address CAM and bssid CAM here, will get leaks during SER (system error recover) L2 reset process and ieee80211_restart_hw() which is called by L2 reset process eventually.

The normal flow would be like -> add interface (acquire 1) -> enter ips (release 1) -> leave ips (acquire 1) -> connection (occupy 1) <(A) 1 leak after L2 reset if non-sec connection>

The ieee80211_restart_hw() flow (under connection) -> ieee80211 reconfig -> add interface (acquire 1) -> leave ips (acquire 1) -> connection (occupy (A) + 2) <(B) 1 more leak>

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Originally, CAM is released before HW restart only if connection is under security. Now, release CAM whatever connection it is to fix leak in (A). OTOH, check if CAM is already valid to avoid acquiring multiple times to fix (B).

Besides, if AP mode, release address CAM of all stations before HW restart.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2022-49539",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "e3ec7017f6a20d12ddd9fe23d345ebb7b8c104dd",
              "lessThan": "f6aff772c9978844529618d86aafb53e5d3ae161",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e3ec7017f6a20d12ddd9fe23d345ebb7b8c104dd",
              "lessThan": "b169f877f001a474fb89939842c390518160bcc5",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/net/wireless/realtek/rtw89/cam.c",
            "drivers/net/wireless/realtek/rtw89/ser.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.16"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.16",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.18.3",
              "versionType": "semver",
              "lessThanOrEqual": "5.18.*"
            },
            {
              "status": "unaffected",
              "version": "5.19",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/net/wireless/realtek/rtw89/cam.c",
            "drivers/net/wireless/realtek/rtw89/ser.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-02-26T07:01:29.857",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/b169f877f001a474fb89939842c390518160bcc5",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f6aff772c9978844529618d86aafb53e5d3ae161",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-401"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrtw89: ser: fix CAM leaks occurring in L2 reset\n\nThe CAM, meaning address CAM and bssid CAM here, will get leaks during\nSER (system error recover) L2 reset process and ieee80211_restart_hw()\nwhich is called by L2 reset process eventually.\n\nThe normal flow would be like\n-> add interface (acquire 1)\n-> enter ips (release 1)\n-> leave ips (acquire 1)\n-> connection (occupy 1) <(A) 1 leak after L2 reset if non-sec connection>\n\nThe ieee80211_restart_hw() flow (under connection)\n-> ieee80211 reconfig\n-> add interface (acquire 1)\n-> leave ips (acquire 1)\n-> connection (occupy (A) + 2) <(B) 1 more leak>\n\nOriginally, CAM is released before HW restart only if connection is under\nsecurity. Now, release CAM whatever connection it is to fix leak in (A).\nOTOH, check if CAM is already valid to avoid acquiring multiple times to\nfix (B).\n\nBesides, if AP mode, release address CAM of all stations before HW restart."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: rtw89: ser: corrige las fugas de CAM que ocurren en el reinicio de L2 El CAM, es decir, la dirección CAM y el bssid CAM aquí, tendrán fugas durante el proceso de reinicio de L2 de SER (recuperación de error del sistema) y ieee80211_restart_hw() que es llamado por el proceso de reinicio de L2 eventualmente. El flujo normal sería como -&gt; agregar interfaz (adquirir 1) -&gt; ingresar ips (liberar 1) -&gt; dejar ips (adquirir 1) -&gt; conexión (ocupar 1) &lt;(A) 1 fuga después del reinicio de L2 si la conexión no es segura&gt; El flujo ieee80211_restart_hw() (bajo conexión) -&gt; ieee80211 reconfig -&gt; agregar interfaz (adquirir 1) -&gt; dejar ips (adquirir 1) -&gt; conexión (ocupar (A) + 2) &lt;(B) 1 fuga más&gt; Originalmente, CAM se libera antes del reinicio de HW solo si la conexión está bajo seguridad. Ahora, libere la CAM de cualquier conexión para reparar la fuga en (A). Por otra parte, verifique si la CAM ya es válida para evitar realizar múltiples adquisiciones para reparar (B). Además, si está en modo AP, libere la dirección CAM de todas las estaciones antes de reiniciar el hardware."
    }
  ],
  "lastModified": "2026-06-17T05:18:23.243",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "98CD047E-3CA9-4A90-93B0-040784FAD016",
              "versionEndExcluding": "5.18.3",
              "versionStartIncluding": "5.16"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}