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

Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-08-17 04:55
VLAI
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
8.1 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
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)
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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 , ≤ * (original_commit_for_fix)
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          }
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        "id": "CVE-2026-64440",
        "lastModified": "2026-09-03T17:48:45.727",
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                "confidentialityImpact": "NONE",
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                "privilegesRequired": "NONE",
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        "published": "2026-07-25T10:17:28.547",
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          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/6f91621fc45025ad3c0be796b70e6e4cee22fc69"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/8c872b47c7fc32e95e0da1db7512388794adcd69"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/918537a0fbed85aab61fa28ad75e6279070610c9"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/bb3b942da4123b55d1cacf19d1a7d5ba15dbf83a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/f8001e1a516ba3b495728c65b61f799cbfad6bd0"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-787"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-07-29T06:53:08+00:00",
      "cve": "CVE-2026-64440",
      "id": "CVE-2026-64440",
      "initial_release_date": "2026-07-25T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: staging: rtl8723bs: fix OOB write in HT_caps_handler()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64440.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-10-03T00:44:20Z",
      "cve": "CVE-2026-64440",
      "id": "CVE-2026-64440",
      "initial_release_date": "2026-07-25T15:59:18Z",
      "product_status:known_affected": "677",
      "product_status:known_not_affected": "75",
      "product_status:recommended": "256",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64440",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64440.json",
      "version": "13"
    }
  }
}



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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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.