{"id":"CVE-2026-64440","revision":null,"records":[{"revision":"03a2890620e84c60a4ef00924975ac72","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-64440","aliases":[],"title":"staging: rtl8723bs: fix OOB write in HT_caps_handler()","description":"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 (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.","state":0,"publishedAt":"2026-07-25T08:51:13.138+00:00","modifiedAt":"2026-10-19T20:38:29.179+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/staging/rtl8723bs/core/rtw_wlan_util.c\"\n ],\n \"versions\": [\n {\n \"version\": \"554c0a3abf216c991c5ebddcdb2c08689ecd290b\",\n \"lessThan\": \"37f642d47c3648a707df3ceb092eee1adffbfd28\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"554c0a3abf216c991c5ebddcdb2c08689ecd290b\",\n \"lessThan\": \"8c872b47c7fc32e95e0da1db7512388794adcd69\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"554c0a3abf216c991c5ebddcdb2c08689ecd290b\",\n \"lessThan\": \"bb3b942da4123b55d1cacf19d1a7d5ba15dbf83a\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"554c0a3abf216c991c5ebddcdb2c08689ecd290b\",\n \"lessThan\": \"918537a0fbed85aab61fa28ad75e6279070610c9\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"554c0a3abf216c991c5ebddcdb2c08689ecd290b\",\n \"lessThan\": \"6f91621fc45025ad3c0be796b70e6e4cee22fc69\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"554c0a3abf216c991c5ebddcdb2c08689ecd290b\",\n \"lessThan\": \"225b6d3fc7e99ac3d20b6c861d1e47d24e7ea31d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"554c0a3abf216c991c5ebddcdb2c08689ecd290b\",\n \"lessThan\": \"f8001e1a516ba3b495728c65b61f799cbfad6bd0\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/staging/rtl8723bs/core/rtw_wlan_util.c\"\n ],\n \"versions\": [\n {\n \"version\": \"4.12\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"4.12\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.212\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.178\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.145\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.96\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.39\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1.4\",\n \"lessThanOrEqual\": \"7.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","score":8.1,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/37f642d47c3648a707df3ceb092eee1adffbfd28","https://git.kernel.org/stable/c/8c872b47c7fc32e95e0da1db7512388794adcd69","https://git.kernel.org/stable/c/bb3b942da4123b55d1cacf19d1a7d5ba15dbf83a","https://git.kernel.org/stable/c/918537a0fbed85aab61fa28ad75e6279070610c9","https://git.kernel.org/stable/c/6f91621fc45025ad3c0be796b70e6e4cee22fc69","https://git.kernel.org/stable/c/225b6d3fc7e99ac3d20b6c861d1e47d24e7ea31d","https://git.kernel.org/stable/c/f8001e1a516ba3b495728c65b61f799cbfad6bd0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64440","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-64440","identifiers":["CVE-2026-64440"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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