CVE-2026-74651 (GCVE-0-2026-74651)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:32 – Updated: 2026-08-25 05:41
VLAI
Title
staging: rtl8723bs: fix OOB read in rtw_get_wpa_ie()
Summary
In the Linux kernel, the following vulnerability has been resolved: staging: rtl8723bs: fix OOB read in rtw_get_wpa_ie() rtw_get_wpa_ie() reads bytes at fixed offsets into a vendor-specific information element without checking that the element is long enough, causing an out-of-bounds read for a short trailing IE. The function locates a vendor-specific IE (EID 221) with rtw_get_ie() and then compares a 4-byte OUI+type at pbuf + 2 and reads a 2-byte version word at pbuf + 6. Those accesses require the IE body to be at least 6 bytes, but rtw_get_ie() only guarantees that the element fits within the buffer; it does not enforce a minimum body length. A vendor-specific IE whose length byte is 0 to 5, placed at the end of the buffer, therefore makes these reads run past the end of the IE and past the end of the buffer itself. The buffer holds information elements taken from received management frames and from the IE blob passed to rtw_cfg80211_set_wpa_ie(), which is kmemdup'd to its exact length, so the read can run off the end of the allocation. The sibling helpers rtw_get_sec_ie(), rtw_get_wapi_ie() and rtw_get_wps_ie() in this file already reject too-short vendor-specific IEs before their OUI memcmp(); rtw_get_wpa_ie() was never brought in line with them, and needs a minimum of 6 rather than 4 bytes because of the version word. Add the missing length check.
Severity
8.1 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 554c0a3abf216c991c5ebddcdb2c08689ecd290b , < 4fc459c5cd8767ca4d9bf2f7becbd562639ba4d9 (git)
Affected: 554c0a3abf216c991c5ebddcdb2c08689ecd290b , < b45be82387bf759931acdd21ca7dfe740f16eb97 (git)
Affected: 554c0a3abf216c991c5ebddcdb2c08689ecd290b , < c9068f82a0906b29c905e8788edb62c3208c7c8a (git)
Affected: 554c0a3abf216c991c5ebddcdb2c08689ecd290b , < 0d19f0600fbb610c42f2a86f95c35706dc04691b (git)
Affected: 554c0a3abf216c991c5ebddcdb2c08689ecd290b , < 42c5a0d454aa5b54fec17162d9a1f8c30f8af45a (git)
Affected: 554c0a3abf216c991c5ebddcdb2c08689ecd290b , < e167a38a8a8f50f137721fef1a1fbba0f4588b5d (git)
Affected: 554c0a3abf216c991c5ebddcdb2c08689ecd290b , < 01ab275f8f3e497a13ebbe4ded44ec0623bccde3 (git)
Affected: 554c0a3abf216c991c5ebddcdb2c08689ecd290b , < 1c3e23e78862493e8cf1adad02b10ffcb8b9921c (git)
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Linux Linux Affected: 4.12
Unaffected: 0 , < 4.12 (semver)
Unaffected: 5.10.265 , ≤ 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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          "product": "Linux",
          "programFiles": [
            "drivers/staging/rtl8723bs/core/rtw_ieee80211.c"
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              "version": "6.6.152",
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              "versionType": "original_commit_for_fix"
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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_get_wpa_ie()\n\nrtw_get_wpa_ie() reads bytes at fixed offsets into a vendor-specific\ninformation element without checking that the element is long enough,\ncausing an out-of-bounds read for a short trailing IE.\n\nThe function locates a vendor-specific IE (EID 221) with rtw_get_ie()\nand then compares a 4-byte OUI+type at pbuf + 2 and reads a 2-byte\nversion word at pbuf + 6. Those accesses require the IE body to be at\nleast 6 bytes, but rtw_get_ie() only guarantees that the element fits\nwithin the buffer; it does not enforce a minimum body length. A\nvendor-specific IE whose length byte is 0 to 5, placed at the end of\nthe buffer, therefore makes these reads run past the end of the IE and\npast the end of the buffer itself.\n\nThe buffer holds information elements taken from received management\nframes and from the IE blob passed to rtw_cfg80211_set_wpa_ie(), which\nis kmemdup\u0027d to its exact length, so the read can run off the end of\nthe allocation.\n\nThe sibling helpers rtw_get_sec_ie(), rtw_get_wapi_ie() and\nrtw_get_wps_ie() in this file already reject too-short vendor-specific\nIEs before their OUI memcmp(); rtw_get_wpa_ie() was never brought in\nline with them, and needs a minimum of 6 rather than 4 bytes because\nof the version word. Add the missing length check."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - rtw_get_wpa_ie() is reached when rtl8723bs parses attacker-controlled 802.11 management IEs from received beacons during client auth/association (OnBeacon\u2192rtw_get_bcn_info/rtw_check_bcn_info); per kernel guidance WiFi frame delivery requires an adjacent wireless attacker.\nAC:L - An adjacent attacker fully controls beacon/probe-response IE layout; placing a trailing vendor-specific IE (EID 221) with length 0\u20135 and a matching WPA OUI reliably triggers the missing minimum-length check without races or uncontrollable victim state.\nPR:N - Exploitation via malicious or spoofed over-the-air beacons requires no account, capabilities, or WPA credentials on the victim; the vulnerable parsing runs on pre-authentication and periodic beacon paths before any verified association secrets.\nUI:N - An evil-twin or rogue AP can deliver malformed beacons matching a victim\u0027s connected BSSID during automatic beacon processing without requiring new user clicks, mounts, or connect actions beyond routine WiFi operation.\nS:U - Impact is confined to kernel memory reads/crashes inside the rtl8723bs WiFi driver on the same host; there is no demonstrated VM escape, container breakout, or IOMMU boundary crossing.\nC:H - The bug performs unchecked memcmp()/memcpy() up to six bytes past the end of a kmemdup\u0027d IE buffer or declared IE length, reading adjacent kernel/heap memory; under the conservative OOB-read rule this is high confidentiality impact.\nI:N - The flaw is a read-only out-of-bounds access with no memory write, structure corruption, or demonstrated control-flow hijack primitive; it cannot modify kernel data or achieve code execution on its own.\nA:H - Reading past a kmemdup allocation or declared IE boundary can fault on unmapped pages or provoke a kernel oops during beacon/auth processing; an adjacent attacker can repeat crafted management frames to deny availability."
            }
          ]
        }
      ],
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        "dateUpdated": "2026-08-25T05:41:09.288Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4fc459c5cd8767ca4d9bf2f7becbd562639ba4d9"
        },
        {
          "url": "https://git.kernel.org/stable/c/b45be82387bf759931acdd21ca7dfe740f16eb97"
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          "url": "https://git.kernel.org/stable/c/c9068f82a0906b29c905e8788edb62c3208c7c8a"
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        },
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          "url": "https://git.kernel.org/stable/c/e167a38a8a8f50f137721fef1a1fbba0f4588b5d"
        },
        {
          "url": "https://git.kernel.org/stable/c/01ab275f8f3e497a13ebbe4ded44ec0623bccde3"
        },
        {
          "url": "https://git.kernel.org/stable/c/1c3e23e78862493e8cf1adad02b10ffcb8b9921c"
        }
      ],
      "title": "staging: rtl8723bs: fix OOB read in rtw_get_wpa_ie()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74651",
    "datePublished": "2026-08-22T15:32:27.073Z",
    "dateReserved": "2026-08-15T05:44:03.923Z",
    "dateUpdated": "2026-08-25T05:41:09.288Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-74651",
      "date": "2026-08-29",
      "epss": "0.00274",
      "percentile": "0.19357"
    },
    "microsoft_vex": {
      "current_release_date": "2026-08-24T14:48:45.000Z",
      "cve": "CVE-2026-74651",
      "id": "msrc_CVE-2026-74651",
      "initial_release_date": "2026-08-24T01:05:40.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "staging: rtl8723bs: fix OOB read in rtw_get_wpa_ie()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74651.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74651\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-22T16:16:38.543\",\"lastModified\":\"2026-08-25T06:18:45.437\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nstaging: rtl8723bs: fix OOB read in rtw_get_wpa_ie()\\n\\nrtw_get_wpa_ie() reads bytes at fixed offsets into a vendor-specific\\ninformation element without checking that the element is long enough,\\ncausing an out-of-bounds read for a short trailing IE.\\n\\nThe function locates a vendor-specific IE (EID 221) with rtw_get_ie()\\nand then compares a 4-byte OUI+type at pbuf + 2 and reads a 2-byte\\nversion word at pbuf + 6. Those accesses require the IE body to be at\\nleast 6 bytes, but rtw_get_ie() only guarantees that the element fits\\nwithin the buffer; it does not enforce a minimum body length. A\\nvendor-specific IE whose length byte is 0 to 5, placed at the end of\\nthe buffer, therefore makes these reads run past the end of the IE and\\npast the end of the buffer itself.\\n\\nThe buffer holds information elements taken from received management\\nframes and from the IE blob passed to rtw_cfg80211_set_wpa_ie(), which\\nis kmemdup\u0027d to its exact length, so the read can run off the end of\\nthe allocation.\\n\\nThe sibling helpers rtw_get_sec_ie(), rtw_get_wapi_ie() and\\nrtw_get_wps_ie() in this file already reject too-short vendor-specific\\nIEs before their OUI memcmp(); rtw_get_wpa_ie() was never brought in\\nline with them, and needs a minimum of 6 rather than 4 bytes because\\nof the version word. Add the missing length check.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/staging/rtl8723bs/core/rtw_ieee80211.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"554c0a3abf216c991c5ebddcdb2c08689ecd290b\",\"lessThan\":\"4fc459c5cd8767ca4d9bf2f7becbd562639ba4d9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"554c0a3abf216c991c5ebddcdb2c08689ecd290b\",\"lessThan\":\"b45be82387bf759931acdd21ca7dfe740f16eb97\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"554c0a3abf216c991c5ebddcdb2c08689ecd290b\",\"lessThan\":\"c9068f82a0906b29c905e8788edb62c3208c7c8a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"554c0a3abf216c991c5ebddcdb2c08689ecd290b\",\"lessThan\":\"0d19f0600fbb610c42f2a86f95c35706dc04691b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"554c0a3abf216c991c5ebddcdb2c08689ecd290b\",\"lessThan\":\"42c5a0d454aa5b54fec17162d9a1f8c30f8af45a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"554c0a3abf216c991c5ebddcdb2c08689ecd290b\",\"lessThan\":\"e167a38a8a8f50f137721fef1a1fbba0f4588b5d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"554c0a3abf216c991c5ebddcdb2c08689ecd290b\",\"lessThan\":\"01ab275f8f3e497a13ebbe4ded44ec0623bccde3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"554c0a3abf216c991c5ebddcdb2c08689ecd290b\",\"lessThan\":\"1c3e23e78862493e8cf1adad02b10ffcb8b9921c\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/staging/rtl8723bs/core/rtw_ieee80211.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.152\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.104\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.45\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.9\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H\",\"baseScore\":8.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":5.2}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/01ab275f8f3e497a13ebbe4ded44ec0623bccde3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0d19f0600fbb610c42f2a86f95c35706dc04691b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1c3e23e78862493e8cf1adad02b10ffcb8b9921c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/42c5a0d454aa5b54fec17162d9a1f8c30f8af45a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4fc459c5cd8767ca4d9bf2f7becbd562639ba4d9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b45be82387bf759931acdd21ca7dfe740f16eb97\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c9068f82a0906b29c905e8788edb62c3208c7c8a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e167a38a8a8f50f137721fef1a1fbba0f4588b5d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-25T08:53:09+00:00",
      "cve": "CVE-2026-74651",
      "id": "CVE-2026-74651",
      "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 rtw_get_wpa_ie()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74651.json",
      "version": "3"
    }
  }
}



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Tags
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.