Vulnerability-Lookup

CVE-2026-64440 (GCVE-0-2026-64440)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-07-25 08:51

Title

staging: rtl8723bs: fix OOB write in HT_caps_handler()

Summary

In the Linux kernel, the following vulnerability has been resolved: staging: rtl8723bs: fix OOB write in HT_caps_handler() HT_caps_handler() iterates pIE->length bytes and writes into HT_caps.u.HT_cap[], which is a fixed 26-byte array (sizeof struct HT_caps_element). Because pIE->length is a raw u8 from an over-the-air 802.11 AssocResponse frame and is never validated, a malicious AP can set it up to 255, causing up to 229 bytes of out-of-bounds writes into adjacent fields of struct mlme_ext_info. Truncate the iteration count to the size of HT_caps.u.HT_cap using umin() so that data from a longer-than-expected IE is silently ignored rather than written out of bounds, preserving interoperability with APs that pad the element. An early return on oversized IEs was considered but rejected: it would bypass the pmlmeinfo->HT_caps_enable = 1 assignment that precedes the loop, silently disabling HT mode for APs that append extra bytes to the HT Capabilities IE.

Severity

No CVSS data available.

Assigner

Linux

References

7 references

URL	Tags
https://git.kernel.org/stable/c/37f642d47c3648a70…
https://git.kernel.org/stable/c/8c872b47c7fc32e95…
https://git.kernel.org/stable/c/bb3b942da4123b55d…
https://git.kernel.org/stable/c/918537a0fbed85aab…
https://git.kernel.org/stable/c/6f91621fc45025ad3…
https://git.kernel.org/stable/c/225b6d3fc7e99ac3d…
https://git.kernel.org/stable/c/f8001e1a516ba3b49…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 554c0a3abf216c991c5ebddcdb2c08689ecd290b , < 37f642d47c3648a707df3ceb092eee1adffbfd28 (git) Affected: 554c0a3abf216c991c5ebddcdb2c08689ecd290b , < 8c872b47c7fc32e95e0da1db7512388794adcd69 (git) Affected: 554c0a3abf216c991c5ebddcdb2c08689ecd290b , < bb3b942da4123b55d1cacf19d1a7d5ba15dbf83a (git) Affected: 554c0a3abf216c991c5ebddcdb2c08689ecd290b , < 918537a0fbed85aab61fa28ad75e6279070610c9 (git) Affected: 554c0a3abf216c991c5ebddcdb2c08689ecd290b , < 6f91621fc45025ad3c0be796b70e6e4cee22fc69 (git) Affected: 554c0a3abf216c991c5ebddcdb2c08689ecd290b , < 225b6d3fc7e99ac3d20b6c861d1e47d24e7ea31d (git) Affected: 554c0a3abf216c991c5ebddcdb2c08689ecd290b , < f8001e1a516ba3b495728c65b61f799cbfad6bd0 (git)
Linux	Linux	Affected: 4.12 Unaffected: 0 , < 4.12 (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc3 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
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          "product": "Linux",
          "programFiles": [
            "drivers/staging/rtl8723bs/core/rtw_wlan_util.c"
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              "version": "4.12"
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              "status": "unaffected",
              "version": "5.15.212",
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            },
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              "status": "unaffected",
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              "versionType": "semver"
            },
            {
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              "status": "unaffected",
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              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.12.96",
              "versionType": "semver"
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc3",
              "versionType": "original_commit_for_fix"
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        }
      ],
      "cpeApplicability": [
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          "nodes": [
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                  "versionStartIncluding": "4.12",
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nstaging: rtl8723bs: fix OOB write in HT_caps_handler()\n\nHT_caps_handler() iterates pIE-\u003elength bytes and writes into\nHT_caps.u.HT_cap[], which is a fixed 26-byte array (sizeof struct\nHT_caps_element). Because pIE-\u003elength is a raw u8 from an over-the-air\n802.11 AssocResponse frame and is never validated, a malicious AP can\nset it up to 255, causing up to 229 bytes of out-of-bounds writes into\nadjacent fields of struct mlme_ext_info.\n\nTruncate the iteration count to the size of HT_caps.u.HT_cap using\numin() so that data from a longer-than-expected IE is silently ignored\nrather than written out of bounds, preserving interoperability with APs\nthat pad the element. An early return on oversized IEs was considered\nbut rejected: it would bypass the pmlmeinfo-\u003eHT_caps_enable = 1\nassignment that precedes the loop, silently disabling HT mode for APs\nthat append extra bytes to the HT Capabilities IE."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-25T08:51:13.138Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/37f642d47c3648a707df3ceb092eee1adffbfd28"
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        },
        {
          "url": "https://git.kernel.org/stable/c/bb3b942da4123b55d1cacf19d1a7d5ba15dbf83a"
        },
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        },
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        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/f8001e1a516ba3b495728c65b61f799cbfad6bd0"
        }
      ],
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64440",
    "datePublished": "2026-07-25T08:51:13.138Z",
    "dateReserved": "2026-07-19T15:36:31.788Z",
    "dateUpdated": "2026-07-25T08:51:13.138Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-07-25",
      "epss": "0.00225",
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  }
}

GHSA-MGM7-8P4Q-P28M

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

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

staging: rtl8723bs: fix OOB write in HT_caps_handler()

HT_caps_handler() iterates pIE->length bytes and writes into HT_caps.u.HT_cap[], which is a fixed 26-byte array (sizeof struct HT_caps_element). Because pIE->length is a raw u8 from an over-the-air 802.11 AssocResponse frame and is never validated, a malicious AP can set it up to 255, causing up to 229 bytes of out-of-bounds writes into adjacent fields of struct mlme_ext_info.

Truncate the iteration count to the size of HT_caps.u.HT_cap using umin() so that data from a longer-than-expected IE is silently ignored rather than written out of bounds, preserving interoperability with APs that pad the element. An early return on oversized IEs was considered but rejected: it would bypass the pmlmeinfo->HT_caps_enable = 1 assignment that precedes the loop, silently disabling HT mode for APs that append extra bytes to the HT Capabilities IE.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-64440"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:28Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nstaging: rtl8723bs: fix OOB write in HT_caps_handler()\n\nHT_caps_handler() iterates pIE-\u003elength bytes and writes into\nHT_caps.u.HT_cap[], which is a fixed 26-byte array (sizeof struct\nHT_caps_element). Because pIE-\u003elength is a raw u8 from an over-the-air\n802.11 AssocResponse frame and is never validated, a malicious AP can\nset it up to 255, causing up to 229 bytes of out-of-bounds writes into\nadjacent fields of struct mlme_ext_info.\n\nTruncate the iteration count to the size of HT_caps.u.HT_cap using\numin() so that data from a longer-than-expected IE is silently ignored\nrather than written out of bounds, preserving interoperability with APs\nthat pad the element. An early return on oversized IEs was considered\nbut rejected: it would bypass the pmlmeinfo-\u003eHT_caps_enable = 1\nassignment that precedes the loop, silently disabling HT mode for APs\nthat append extra bytes to the HT Capabilities IE.",
  "id": "GHSA-mgm7-8p4q-p28m",
  "modified": "2026-07-25T12:31:35Z",
  "published": "2026-07-25T12:31:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64440"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/225b6d3fc7e99ac3d20b6c861d1e47d24e7ea31d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/37f642d47c3648a707df3ceb092eee1adffbfd28"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6f91621fc45025ad3c0be796b70e6e4cee22fc69"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8c872b47c7fc32e95e0da1db7512388794adcd69"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/918537a0fbed85aab61fa28ad75e6279070610c9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bb3b942da4123b55d1cacf19d1a7d5ba15dbf83a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f8001e1a516ba3b495728c65b61f799cbfad6bd0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-64440 (GCVE-0-2026-64440)

GHSA-MGM7-8P4Q-P28M

Tags

Sightings

Nomenclature