FKIE_CVE-2026-74650

Vulnerability from fkie_nvd - Published: 2026-08-22 16:16 - Updated: 2026-10-14 13:10
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: staging: rtl8723bs: fix OOB read in WMM_param_handler() WMM_param_handler() copies a fixed-size WMM parameter element out of a received information element without checking that the element is long enough, causing an out-of-bounds read for a short WMM IE. The handler reads sizeof(struct WMM_para_element) (18) bytes at pIE->data + 6, so it requires pIE->length to be at least 24 (WLAN_WMM_LEN), but it never validates the length. Two of its three callers reach it after matching only the WMM OUI: OnAssocRsp() in rtw_mlme_ext.c matches a 6-byte OUI, and join_cmd_hdl() matches a 4-byte OUI, before calling the handler. A vendor-specific IE carrying the WMM OUI but a length between 6 and 23, placed in an association response or in the IE blob handed to join_cmd_hdl(), passes the OUI check and then makes the memcmp() and memcpy() at pIE->data + 6 read past the end of the element. OnAssocRsp() parses a frame received from the AP, so this is reachable from a remote peer. The remaining caller in rtw_wlan_util.c already guards the handler with "pIE->length == WLAN_WMM_LEN". Move the equivalent check into the handler itself so every caller is covered; the sibling IE handlers in the same parsing loop (HT_caps_handler(), HT_info_handler(), ERP_IE_handler()) likewise bound their accesses by pIE->length.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1158b9931207392d6dd136aa0c4be18893b50fa1
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2bee6f7a0f0125238951e31da2e96d06fe359043
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5df2fd06567df5f178c8faae0bdaefd203618d21
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6cdca4c8b64c15a3ab9ad7a85f482e9519eadf93
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ae21407350151bddfd4fea7aa39bd0643c0ca9d3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ce2399717de242344880044b91a20a712644fdfb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e429c6dfd5d2324cd866daaf4c29d5cfe4dea0e4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e5b7610008f4e6a80c8b071aa77ddbd5e17ea472
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/staging/rtl8723bs/core/rtw_wlan_util.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "5df2fd06567df5f178c8faae0bdaefd203618d21",
              "status": "affected",
              "version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b",
              "versionType": "git"
            },
            {
              "lessThan": "6cdca4c8b64c15a3ab9ad7a85f482e9519eadf93",
              "status": "affected",
              "version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b",
              "versionType": "git"
            },
            {
              "lessThan": "2bee6f7a0f0125238951e31da2e96d06fe359043",
              "status": "affected",
              "version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b",
              "versionType": "git"
            },
            {
              "lessThan": "1158b9931207392d6dd136aa0c4be18893b50fa1",
              "status": "affected",
              "version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b",
              "versionType": "git"
            },
            {
              "lessThan": "ce2399717de242344880044b91a20a712644fdfb",
              "status": "affected",
              "version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b",
              "versionType": "git"
            },
            {
              "lessThan": "e5b7610008f4e6a80c8b071aa77ddbd5e17ea472",
              "status": "affected",
              "version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b",
              "versionType": "git"
            },
            {
              "lessThan": "e429c6dfd5d2324cd866daaf4c29d5cfe4dea0e4",
              "status": "affected",
              "version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b",
              "versionType": "git"
            },
            {
              "lessThan": "ae21407350151bddfd4fea7aa39bd0643c0ca9d3",
              "status": "affected",
              "version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/staging/rtl8723bs/core/rtw_wlan_util.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.12"
            },
            {
              "lessThan": "4.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.267",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "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\nstaging: rtl8723bs: fix OOB read in WMM_param_handler()\n\nWMM_param_handler() copies a fixed-size WMM parameter element out of a\nreceived information element without checking that the element is long\nenough, causing an out-of-bounds read for a short WMM IE.\n\nThe handler reads sizeof(struct WMM_para_element) (18) bytes at\npIE-\u003edata + 6, so it requires pIE-\u003elength to be at least 24\n(WLAN_WMM_LEN), but it never validates the length. Two of its three\ncallers reach it after matching only the WMM OUI: OnAssocRsp() in\nrtw_mlme_ext.c matches a 6-byte OUI, and join_cmd_hdl() matches a\n4-byte OUI, before calling the handler. A vendor-specific IE carrying\nthe WMM OUI but a length between 6 and 23, placed in an association\nresponse or in the IE blob handed to join_cmd_hdl(), passes the OUI\ncheck and then makes the memcmp() and memcpy() at pIE-\u003edata + 6 read\npast the end of the element. OnAssocRsp() parses a frame received from\nthe AP, so this is reachable from a remote peer.\n\nThe remaining caller in rtw_wlan_util.c already guards the handler with\n\"pIE-\u003elength == WLAN_WMM_LEN\". Move the equivalent check into the\nhandler itself so every caller is covered; the sibling IE handlers in\nthe same parsing loop (HT_caps_handler(), HT_info_handler(),\nERP_IE_handler()) likewise bound their accesses by pIE-\u003elength."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nstaging: rtl8723bs: correcci\u00f3n de lectura fuera de l\u00edmites en WMM_param_handler()\n\nWMM_param_handler() copia un elemento de par\u00e1metro WMM de tama\u00f1o fijo de un elemento de informaci\u00f3n recibido sin verificar que el elemento sea lo suficientemente largo, causando una lectura fuera de l\u00edmites para un IE WMM corto.\n\nEl gestor lee sizeof(struct WMM_para_element) (18) bytes en pIE -\u003e data + 6, por lo que requiere que pIE -\u003e length sea al menos 24 (WLAN_WMM_LEN), pero nunca valida la longitud. Dos de sus tres llamadores lo alcanzan despu\u00e9s de coincidir solo con el OUI WMM: OnAssocRsp() en rtw_mlme_ext.c coincide con un OUI de 6 bytes, y join_cmd_hdl() coincide con un OUI de 4 bytes, antes de llamar al gestor. Un IE espec\u00edfico del proveedor que lleva el OUI WMM pero una longitud entre 6 y 23, colocado en una respuesta de asociaci\u00f3n o en el blob de IE entregado a join_cmd_hdl(), pasa la verificaci\u00f3n del OUI y luego hace que memcmp() y memcpy() en pIE -\u003e data + 6 lean m\u00e1s all\u00e1 del final del elemento. OnAssocRsp() analiza una trama recibida del AP, por lo que esto es alcanzable desde un par remoto.\n\nEl llamador restante en rtw_wlan_util.c ya protege al gestor con \u0027pIE -\u003e length == WLAN_WMM_LEN\u0027. Mover la verificaci\u00f3n equivalente al propio gestor para que cada llamador est\u00e9 cubierto; los gestores de IE hermanos en el mismo bucle de an\u00e1lisis (HT_caps_handler(), HT_info_handler(), ERP_IE_handler()) de manera similar limitan sus accesos por pIE -\u003e length."
    }
  ],
  "id": "CVE-2026-74650",
  "lastModified": "2026-10-14T13:10:00.187",
  "metrics": {},
  "published": "2026-08-22T16:16:38.413",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1158b9931207392d6dd136aa0c4be18893b50fa1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2bee6f7a0f0125238951e31da2e96d06fe359043"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5df2fd06567df5f178c8faae0bdaefd203618d21"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6cdca4c8b64c15a3ab9ad7a85f482e9519eadf93"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ae21407350151bddfd4fea7aa39bd0643c0ca9d3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ce2399717de242344880044b91a20a712644fdfb"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e429c6dfd5d2324cd866daaf4c29d5cfe4dea0e4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e5b7610008f4e6a80c8b071aa77ddbd5e17ea472"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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