CVE-2026-64445 (GCVE-0-2026-64445)
Vulnerability from cvelistv5
Published
2026-07-25 08:51
Modified
2026-10-19 20:38
Severity ?
8.8 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: staging: rtl8723bs: fix WEP length underflow and OOB read in OnAuth() OnAuth() has two bugs in the shared-key authentication path. When the Privacy bit is set, rtw_wep_decrypt() is called without verifying that the frame is long enough to contain a valid WEP IV and ICV. Inside rtw_wep_decrypt(), length is computed as: length = len - WLAN_HDR_A3_LEN - iv_len and then passed as (length - 4) to crc32_le(). If len is less than WLAN_HDR_A3_LEN + iv_len + icv_len (32 bytes), length - 4 is negative and, after the implicit cast to size_t, causes crc32_le() to read far beyond the frame buffer. Add a minimum length check before accessing the IV field and calling the decryption path. When processing a seq=3 response, rtw_get_ie() stores the Challenge Text IE length in ie_len, but the subsequent memcmp() always reads 128 bytes regardless of ie_len. IEEE 802.11 mandates a challenge text of exactly 128 bytes; reject any IE whose length field differs, matching the check already applied to OnAuthClient().
References
Impacted products
Vendor Product Version
Linux Linux Version: 554c0a3abf216c991c5ebddcdb2c08689ecd290b
Version: 554c0a3abf216c991c5ebddcdb2c08689ecd290b
Version: 554c0a3abf216c991c5ebddcdb2c08689ecd290b
Version: 554c0a3abf216c991c5ebddcdb2c08689ecd290b
Version: 554c0a3abf216c991c5ebddcdb2c08689ecd290b
Version: 554c0a3abf216c991c5ebddcdb2c08689ecd290b
Version: 554c0a3abf216c991c5ebddcdb2c08689ecd290b
Version: 554c0a3abf216c991c5ebddcdb2c08689ecd290b
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Inside rtw_wep_decrypt(), length is computed as:\\n\\n    length = len - WLAN_HDR_A3_LEN - iv_len\\n\\nand then passed as (length - 4) to crc32_le().  If len is less than\\nWLAN_HDR_A3_LEN + iv_len + icv_len (32 bytes), length - 4 is negative\\nand, after the implicit cast to size_t, causes crc32_le() to read far\\nbeyond the frame buffer.  Add a minimum length check before accessing\\nthe IV field and calling the decryption path.\\n\\nWhen processing a seq=3 response, rtw_get_ie() stores the Challenge\\nText IE length in ie_len, but the subsequent memcmp() always reads 128\\nbytes regardless of ie_len.  IEEE 802.11 mandates a challenge text of\\nexactly 128 bytes; reject any IE whose length field differs, matching\\nthe check already applied to OnAuthClient().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.261\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.212\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.178\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.145\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.96\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.39\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.4\", \"versionStartIncluding\": \"4.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"4.12\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-17T04:55:47.787Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-64445\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T20:38:29.983Z\", \"dateReserved\": \"2026-07-19T15:36:31.788Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-07-25T08:51:16.670Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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