{"id":"CVE-2026-64440","title":"staging: rtl8723bs: fix OOB write in HT_caps_handler()","summary":"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->length bytes and writes into\nHT_caps.u.HT_cap[], which is a fixed 26-byte array …","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b < 37f642d47c3648a707df3ceb092eee1adffbfd28","Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b < 8c872b47c7fc32e95e0da1db7512388794adcd69","Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b < bb3b942da4123b55d1cacf19d1a7d5ba15dbf83a","Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b < 918537a0fbed85aab61fa28ad75e6279070610c9","Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b < 6f91621fc45025ad3c0be796b70e6e4cee22fc69","Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b < 225b6d3fc7e99ac3d20b6c861d1e47d24e7ea31d","Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b < f8001e1a516ba3b495728c65b61f799cbfad6bd0","Linux 4.12"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-16T15:40:46.718780Z"},"published":"2026-07-25","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:42:36.038Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64440","references":[{"url":"https://git.kernel.org/stable/c/37f642d47c3648a707df3ceb092eee1adffbfd28"},{"url":"https://git.kernel.org/stable/c/8c872b47c7fc32e95e0da1db7512388794adcd69"},{"url":"https://git.kernel.org/stable/c/bb3b942da4123b55d1cacf19d1a7d5ba15dbf83a"},{"url":"https://git.kernel.org/stable/c/918537a0fbed85aab61fa28ad75e6279070610c9"},{"url":"https://git.kernel.org/stable/c/6f91621fc45025ad3c0be796b70e6e4cee22fc69"},{"url":"https://git.kernel.org/stable/c/225b6d3fc7e99ac3d20b6c861d1e47d24e7ea31d"},{"url":"https://git.kernel.org/stable/c/f8001e1a516ba3b495728c65b61f799cbfad6bd0"}],"tags":["cve.org"],"epss":0.00266,"epssPercentile":0.17274,"ingestedAt":"2026-10-16T17:24:46.820Z","slug":"CVE-2026-64440","body":"## Overview\n\nIn 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->length bytes and writes into\nHT_caps.u.HT_cap[], which is a fixed 26-byte array (sizeof struct\nHT_caps_element). Because pIE->length 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->HT_caps_enable = 1\nassignment that precedes the loop, silently disabling HT mode for APs\nthat append extra bytes to the HT Capabilities IE.\n\n## Affected\n\n- `Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b < 37f642d47c3648a707df3ceb092eee1adffbfd28`\n- `Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b < 8c872b47c7fc32e95e0da1db7512388794adcd69`\n- `Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b < bb3b942da4123b55d1cacf19d1a7d5ba15dbf83a`\n- `Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b < 918537a0fbed85aab61fa28ad75e6279070610c9`\n- `Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b < 6f91621fc45025ad3c0be796b70e6e4cee22fc69`\n- `Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b < 225b6d3fc7e99ac3d20b6c861d1e47d24e7ea31d`\n- `Linux >= 554c0a3abf216c991c5ebddcdb2c08689ecd290b < f8001e1a516ba3b495728c65b61f799cbfad6bd0`\n- `Linux 4.12`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}