← Back to CVE Explorer

CVE-2026-64443

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: staging: rtl8723bs: fix OOB read in update_beacon_info() IE loop The IE parsing loop in update_beacon_info() advances by (pIE->length + 2) each iteration but only guards on i < len. When a malicious AP sends a Beacon whose last IE has only one byte remaining in the frame (the element_id byte lands at len-1), the loop reads pIE->length from one byte past the allocated receive buffer. Additionally, even when the header bytes are in bounds, pIE->length itself can extend the data window beyond len, passing a truncated IE to the handler functions. Add two guards at the top of the loop body: 1. Break if fewer than sizeof(*pIE) bytes remain (can't read header). 2. Break if the IE's declared data extends past len. Also replace i += (pIE->length + 2) with i += sizeof(*pIE) + pIE->length for consistency with the sizeof(*pIE) guards added above.

Severity
HIGH
CVSS score
8.1 (v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-07-25 10:17:28.930000
Last modified
2026-10-19 21:17:38.930000
View original CVE JSON 
{
  "id": "CVE-2026-64443",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-07-25T10:17:28.930",
  "lastModified": "2026-10-19T21:17:38.930",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nstaging: rtl8723bs: fix OOB read in update_beacon_info() IE loop\n\nThe IE parsing loop in update_beacon_info() advances by\n(pIE->length + 2) each iteration but only guards on i < len.\nWhen a malicious AP sends a Beacon whose last IE has only one byte\nremaining in the frame (the element_id byte lands at len-1), the loop\nreads pIE->length from one byte past the allocated receive buffer.\n\nAdditionally, even when the header bytes are in bounds, pIE->length\nitself can extend the data window beyond len, passing a truncated IE\nto the handler functions.\n\nAdd two guards at the top of the loop body:\n  1. Break if fewer than sizeof(*pIE) bytes remain (can't read header).\n  2. Break if the IE's declared data extends past len.\n\nAlso replace i += (pIE->length + 2) with i += sizeof(*pIE) + pIE->length\nfor consistency with the sizeof(*pIE) guards added above."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/staging/rtl8723bs/core/rtw_wlan_util.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b",
              "lessThan": "5e8db4cff5b45c7c4edc8ae3f302027c3bb32b25",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b",
              "lessThan": "6dd5e8c3011ebabf417257d7f07901a7c4311539",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b",
              "lessThan": "9193c34f75fd9e1ea8a590d7cced464c3380dc29",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b",
              "lessThan": "bd953d52d587d42365e399b96c52dbdb13032070",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b",
              "lessThan": "69f174a0673b6b7a29b851adb60bc450cdc0ecc4",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b",
              "lessThan": "b5cc2f999927f69723ca53f1f2a3aa37dbeda907",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b",
              "lessThan": "ed51de4a86e173c3b0ef78e039c2e49e08b11f16",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/staging/rtl8723bs/core/rtw_wlan_util.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": "5.15.212",
              "lessThanOrEqual": "5.15.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.178",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.145",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.96",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.39",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.1.4",
              "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
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-10-16T15:40:53.876241Z",
          "id": "CVE-2026-64443",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ]
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "4.12",
              "versionEndExcluding": "5.15.212",
              "matchCriteriaId": "ECD09A06-DFA0-4C51-86A6-8C74508A9B8D"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "5.16",
              "versionEndExcluding": "6.1.178",
              "matchCriteriaId": "092233C7-F4E0-40C8-BD4D-A28FE50DFE20"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "6.2",
              "versionEndExcluding": "6.6.145",
              "matchCriteriaId": "7046B092-F810-4440-ACE6-60218518EECE"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "6.7",
              "versionEndExcluding": "6.12.96",
              "matchCriteriaId": "38A8100E-2B1A-462F-AEE9-8901B870FEF2"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "6.13",
              "versionEndExcluding": "6.18.39",
              "matchCriteriaId": "914AE4BC-3D59-4C5A-9DB5-9CE327B429F7"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "6.19",
              "versionEndExcluding": "7.1.4",
              "matchCriteriaId": "6228DDD6-4557-4AA3-9F43-AB995D471E42"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:linux:linux_kernel:7.2:rc1:*:*:*:*:*:*",
              "matchCriteriaId": "5E8B9085-7ADB-4A05-89EF-12949B6A0509"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:o:linux:linux_kernel:7.2:rc2:*:*:*:*:*:*",
              "matchCriteriaId": "1FC0D50D-9D58-4947-A197-A5A3FF07E7E3"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/5e8db4cff5b45c7c4edc8ae3f302027c3bb32b25",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://git.kernel.org/stable/c/69f174a0673b6b7a29b851adb60bc450cdc0ecc4",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://git.kernel.org/stable/c/6dd5e8c3011ebabf417257d7f07901a7c4311539",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://git.kernel.org/stable/c/9193c34f75fd9e1ea8a590d7cced464c3380dc29",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://git.kernel.org/stable/c/b5cc2f999927f69723ca53f1f2a3aa37dbeda907",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://git.kernel.org/stable/c/bd953d52d587d42365e399b96c52dbdb13032070",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ]
    },
    {
      "url": "https://git.kernel.org/stable/c/ed51de4a86e173c3b0ef78e039c2e49e08b11f16",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ]
    }
  ]
}