{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "554c0a3abf216c991c5ebddcdb2c08689ecd290b"
            },
            {
              "fixed": "37f642d47c3648a707df3ceb092eee1adffbfd28"
            },
            {
              "fixed": "8c872b47c7fc32e95e0da1db7512388794adcd69"
            },
            {
              "fixed": "bb3b942da4123b55d1cacf19d1a7d5ba15dbf83a"
            },
            {
              "fixed": "918537a0fbed85aab61fa28ad75e6279070610c9"
            },
            {
              "fixed": "6f91621fc45025ad3c0be796b70e6e4cee22fc69"
            },
            {
              "fixed": "225b6d3fc7e99ac3d20b6c861d1e47d24e7ea31d"
            },
            {
              "fixed": "f8001e1a516ba3b495728c65b61f799cbfad6bd0"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.12.0"
            },
            {
              "fixed": "5.15.212"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.178"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.96"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.39"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64440.json"
  },
  "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": "CVE-2026-64440",
  "modified": "2026-07-27T03:56:44.635982112Z",
  "published": "2026-07-25T08:51:13.138Z",
  "references": [
    {
      "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"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64440.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64440"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "summary": "staging: rtl8723bs: fix OOB write in HT_caps_handler()"
}