CVE-2026-90016 (GCVE-0-2026-90016)
Vulnerability from cvelistv5
Published
2026-09-16 10:33
Modified
2026-10-21 12:49
Severity ?
7.1 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: staging: rtl8723bs: fix OOB read in rtw_restruct_wmm_ie() rtw_restruct_wmm_ie() scans in_ie for a WMM IE with: while (i < in_len) { ... if (i + 5 < in_len && in_ie[i] == 0xDD && ...) { ... break; } i += (in_ie[i + 1] + 2); /* to the next IE element */ } When the "i + 5 < in_len" match check fails simply because i is within 5 bytes of the end of the buffer (i.e. no WMM IE was found near the tail of in_ie), execution falls through to "i += (in_ie[i + 1] + 2)", which reads in_ie[i + 1]. If i == in_len - 1 at that point, this is a 1-byte out-of-bounds read of an attacker-influenced IE buffer built from association/scan data. Commit a75281626fc8f ("staging: rtl8723bs: fix potential out-of-bounds read in rtw_restruct_wmm_ie") added the "i + 5 < in_len" guard to the match condition itself, but did not add an equivalent guard before the fallthrough advance, so the same class of OOB read remained reachable through the non-matching path. Add an explicit bounds check before advancing to the next IE.
References
Impacted products
Vendor Product Version
Linux Linux Version: 554c0a3abf216c991c5ebddcdb2c08689ecd290b
Version: 554c0a3abf216c991c5ebddcdb2c08689ecd290b
Version: 554c0a3abf216c991c5ebddcdb2c08689ecd290b
Version: 554c0a3abf216c991c5ebddcdb2c08689ecd290b
Version: 554c0a3abf216c991c5ebddcdb2c08689ecd290b
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
            "drivers/staging/rtl8723bs/core/rtw_mlme.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "4.12"
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              "version": "0",
              "versionType": "semver"
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              "lessThanOrEqual": "6.18.*",
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              "version": "6.18.52",
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              "version": "7.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.160",
                  "versionStartIncluding": "4.12",
                  "vulnerable": true
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                  "versionEndExcluding": "6.12.112",
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                  "vulnerable": true
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              "negate": false,
              "operator": "OR"
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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 rtw_restruct_wmm_ie()\n\nrtw_restruct_wmm_ie() scans in_ie for a WMM IE with:\n\n\twhile (i \u003c in_len) {\n\t\t...\n\t\tif (i + 5 \u003c in_len \u0026\u0026 in_ie[i] == 0xDD \u0026\u0026 ...) {\n\t\t\t...\n\t\t\tbreak;\n\t\t}\n\t\ti += (in_ie[i + 1] + 2); /* to the next IE element */\n\t}\n\nWhen the \"i + 5 \u003c in_len\" match check fails simply because i is\nwithin 5 bytes of the end of the buffer (i.e. no WMM IE was found\nnear the tail of in_ie), execution falls through to\n\"i += (in_ie[i + 1] + 2)\", which reads in_ie[i + 1]. If i == in_len\n- 1 at that point, this is a 1-byte out-of-bounds read of an\nattacker-influenced IE buffer built from association/scan data.\n\nCommit a75281626fc8f (\"staging: rtl8723bs: fix potential\nout-of-bounds read in rtw_restruct_wmm_ie\") added the \"i + 5 \u003c\nin_len\" guard to the match condition itself, but did not add an\nequivalent guard before the fallthrough advance, so the same class\nof OOB read remained reachable through the non-matching path.\n\nAdd an explicit bounds check before advancing to the next IE."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - rtw_restruct_wmm_ie() walks WMM IEs from scanned BSS candidates filled by collect_bss_info() from over-the-air beacon and probe-response frames (OnBeacon/OnProbeRsp). The attacker must be in WiFi radio range; kernel guidance maps WiFi frame injection to Adjacent.\nAC:L - The attacker fully controls beacon/probe IE layout and can place a truncated tail IE so the walker lands at in_len-1, making the unguarded in_ie[i+1] read deterministic. wmm_enable defaults to 1, and no race or attacker-uncontrollable memory layout is required.\nPR:N - Scan and join/roam consume attacker beacon IEs before any authentication with the rogue BSS. No local account, capability, or user-namespace privilege is required.\nUI:N - RTW_ROAM_ON_EXPIRED is enabled by default, so association expiry or an attacker-driven reconnect automatically calls rtw_select_and_join_from_scanned_queue() without a new victim click. An evil-twin BSS matching the desired SSID is selected by RSSI during normal WiFi operation.\nS:U - The out-of-bounds read and any resulting kernel impact remain inside the rtl8723bs driver on the host. This is not a VM escape, IOMMU bypass, or other cross-authority boundary crossing.\nC:L - The fallthrough path reads exactly one byte past the declared IE length (in_ie[i+1] when i==in_len-1). Kernel guidance scores a strictly bounded few-byte out-of-bounds read as Low confidentiality rather than an arbitrary-read primitive.\nI:N - The bug only reads in_ie[i+1] to compute the next IE offset and then exits the loop. It does not write out of bounds or provide a data-modification or control-flow hijack primitive.\nA:H - An out-of-bounds kernel read can oops or panic on hardened, KASAN, or redzone kernels, and an adjacent attacker can retrigger the join/roam path with further crafted management frames to deny availability."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:49:26.409Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/716850842d2f103f915fe7c857ff1a0a036491b4"
        },
        {
          "url": "https://git.kernel.org/stable/c/e63b72c5d7336981dfc05e5cb92becff29dfea00"
        },
        {
          "url": "https://git.kernel.org/stable/c/4420cc71841b50e31a7868ef7acb011c0e08d294"
        },
        {
          "url": "https://git.kernel.org/stable/c/fd19b8895f8a91087e8a62f1e27b128025dabb95"
        },
        {
          "url": "https://git.kernel.org/stable/c/28a289beaf226b30b1e6e7d7b1a2946fe2d6e852"
        }
      ],
      "title": "staging: rtl8723bs: fix OOB read in rtw_restruct_wmm_ie()",
      "x_generator": {
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90016",
    "datePublished": "2026-09-16T10:33:22.148Z",
    "dateReserved": "2026-09-11T19:38:34.781Z",
    "dateUpdated": "2026-10-21T12:49:26.409Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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