CVE-2026-74650 (GCVE-0-2026-74650)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:32 – Updated: 2026-08-27 12:39
VLAI
Title
staging: rtl8723bs: fix OOB read in WMM_param_handler()
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6666 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 554c0a3abf216c991c5ebddcdb2c08689ecd290b , < 5df2fd06567df5f178c8faae0bdaefd203618d21 (git)
Affected: 554c0a3abf216c991c5ebddcdb2c08689ecd290b , < 6cdca4c8b64c15a3ab9ad7a85f482e9519eadf93 (git)
Affected: 554c0a3abf216c991c5ebddcdb2c08689ecd290b , < 2bee6f7a0f0125238951e31da2e96d06fe359043 (git)
Affected: 554c0a3abf216c991c5ebddcdb2c08689ecd290b , < 1158b9931207392d6dd136aa0c4be18893b50fa1 (git)
Affected: 554c0a3abf216c991c5ebddcdb2c08689ecd290b , < ce2399717de242344880044b91a20a712644fdfb (git)
Affected: 554c0a3abf216c991c5ebddcdb2c08689ecd290b , < e5b7610008f4e6a80c8b071aa77ddbd5e17ea472 (git)
Affected: 554c0a3abf216c991c5ebddcdb2c08689ecd290b , < e429c6dfd5d2324cd866daaf4c29d5cfe4dea0e4 (git)
Affected: 554c0a3abf216c991c5ebddcdb2c08689ecd290b , < ae21407350151bddfd4fea7aa39bd0643c0ca9d3 (git)
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Linux Linux Affected: 4.12
Unaffected: 0 , < 4.12 (semver)
Unaffected: 5.10.267 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.152 , ≤ 6.6.* (semver)
Unaffected: 6.12.104 , ≤ 6.12.* (semver)
Unaffected: 6.18.45 , ≤ 6.18.* (semver)
Unaffected: 7.1.9 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "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."
        }
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          "url": "https://git.kernel.org/stable/c/2bee6f7a0f0125238951e31da2e96d06fe359043"
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        },
        {
          "url": "https://git.kernel.org/stable/c/ae21407350151bddfd4fea7aa39bd0643c0ca9d3"
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    "cveId": "CVE-2026-74650",
    "datePublished": "2026-08-22T15:32:26.333Z",
    "dateReserved": "2026-08-15T05:44:03.923Z",
    "dateUpdated": "2026-08-27T12:39:54.006Z",
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "staging: rtl8723bs: fix OOB read in WMM_param_handler()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74650.json",
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        "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"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-01T10:37:42+00:00",
      "cve": "CVE-2026-74650",
      "id": "CVE-2026-74650",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: staging: rtl8723bs: fix OOB read in WMM_param_handler()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74650.json",
      "version": "3"
    }
  }
}



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