{"id":"CVE-2026-90018","revision":"b5f81e1459164b3b86d5e5b2adcdf2f8","records":[{"revision":"b5f81e1459164b3b86d5e5b2adcdf2f8","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-90018","aliases":[],"title":"staging: rtl8723bs: fix OOB read / stack overflow in rtw_get_wps_attr()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nstaging: rtl8723bs: fix OOB read / stack overflow in rtw_get_wps_attr()\n\nrtw_get_wps_attr() walks WPS attributes inside a WPS IE taken from\na wireless management frame. For each candidate attribute it only\nchecks that the fixed 4-byte attribute header (2-byte ID + 2-byte\nlength) fits inside the IE:\n\n\tif (attr_ptr + 4 > wps_ie + wps_ielen)\n\t\tbreak;\n\tu16 attr_id = get_unaligned_be16(attr_ptr);\n\tu16 attr_data_len = get_unaligned_be16(attr_ptr + 2);\n\tu16 attr_len = attr_data_len + 4;\n\nattr_data_len (and therefore attr_len) is read directly from the\nwire and is never checked against the remaining bytes in the IE\nbefore being used as the size of:\n\n\tmemcpy(buf_attr, attr_ptr, attr_len);\n\nSince attr_len is fully attacker controlled (0 to 65535+4), this is\nboth a heap OOB read of wps_ie, and, more seriously, a stack buffer\noverflow at several call sites where buf_attr is a single-byte\nstack variable, e.g. rtw_get_wps_attr_content()'s callers passing\nWPS_ATTR_SELECTED_REGISTRAR into a stack \"u8 sr\"/\"u8\nselected_registrar\" (drivers/staging/rtl8723bs/os_dep/ioctl_cfg80211.c,\ndrivers/staging/rtl8723bs/core/rtw_mlme_ext.c). A crafted WPS IE in a\nbeacon or probe response processed during scanning can therefore\nsmash the stack of the parsing thread.\n\nrtw_get_wps_attr_content() itself has no independent length check\nand simply trusts the attr_len it gets back from rtw_get_wps_attr(),\nso fixing the bound here also fixes that caller.\n\nThe \"attr_ptr + 4 > wps_ie + wps_ielen\" header check above was added\nby commit 1463ca3ec6601 (\"staging: rtl8723bs: fix OOB reads in\nrtw_get_sec_ie(), rtw_get_wapi_ie(), and rtw_get_wps_attr()\"), which\nbounded the fixed header but never extended the check to cover the\nvariable-length attribute data that follows it. Add that missing\ncheck before attr_len is used as a memcpy() length or accepted as a\nmatch.","state":0,"publishedAt":"2026-09-16T10:33:23.489+00:00","modifiedAt":"2026-10-19T08:56:31.878+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_ieee80211.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"554c0a3abf216c991c5ebddcdb2c08689ecd290b\",\n                            \"lessThan\": \"931640dfcb8cfa08f6cfb46229716d8072356420\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"554c0a3abf216c991c5ebddcdb2c08689ecd290b\",\n                            \"lessThan\": \"3a6457ebf39080b87c712657fdb38f34a24fc3ff\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"554c0a3abf216c991c5ebddcdb2c08689ecd290b\",\n                            \"lessThan\": \"fd5e24ea8373347d0352f153a66e8647337d1b10\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"554c0a3abf216c991c5ebddcdb2c08689ecd290b\",\n                            \"lessThan\": \"a53d1ac9ce63db07943b2b2248111003851fb00f\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"554c0a3abf216c991c5ebddcdb2c08689ecd290b\",\n                            \"lessThan\": \"ff61aa3289355dafa811550a1764691cd1f5d33b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"554c0a3abf216c991c5ebddcdb2c08689ecd290b\",\n                            \"lessThan\": \"34f51d196c43a42046d229de5e79025d5ca553ca\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"554c0a3abf216c991c5ebddcdb2c08689ecd290b\",\n                            \"lessThan\": \"99aa998dec83ba180822f70e6d48a514fc81c20d\",\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_ieee80211.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\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.110\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.51\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.5\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\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:H/I:H/A:H","score":8.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/931640dfcb8cfa08f6cfb46229716d8072356420","https://git.kernel.org/stable/c/3a6457ebf39080b87c712657fdb38f34a24fc3ff","https://git.kernel.org/stable/c/fd5e24ea8373347d0352f153a66e8647337d1b10","https://git.kernel.org/stable/c/a53d1ac9ce63db07943b2b2248111003851fb00f","https://git.kernel.org/stable/c/ff61aa3289355dafa811550a1764691cd1f5d33b","https://git.kernel.org/stable/c/34f51d196c43a42046d229de5e79025d5ca553ca","https://git.kernel.org/stable/c/99aa998dec83ba180822f70e6d48a514fc81c20d"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-90018","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-90018","identifiers":["CVE-2026-90018"]},"retained":false,"historicalAffected":[]}],"coverage":[]}