{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-90018", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.781Z", "datePublished": "2026-09-16T10:33:23.489Z", "dateUpdated": "2026-10-19T08:56:31.878Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:56:31.878Z" }, "descriptions": [ { "lang": "en", "value": "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:A - A nearby attacker injects a crafted 802.11 beacon or probe response carrying a malformed WPS IE; rtl8723bs receives it over SDIO during scan (OnBeacon/OnProbeRsp → collect_bss_info → rtw_cfg80211_inform_bss → rtw_get_wps_attr), so the attacker must be on the same WiFi radio segment.\nAC:L - The attacker fully controls the WPS attribute ID and the 16-bit length field and can reliably hit the parser on any scan; no race, rare config, or other condition outside the attacker’s control is required.\nPR:N - Beacons and probe responses are processed before any association or authentication with the attacker-controlled BSS, so no local account, capability, or WiFi credentials on the victim are required.\nUI:N - Phones, Atom laptops, and IoT devices with this chip perform background and NetworkManager scans without a per-attack user action; once the interface is scanning, the driver parses received management frames on its own.\nS:U - The overflow corrupts kernel stack and adjacent heap inside the rtl8723bs driver; impact stays in the host kernel security authority and does not cross a VM, container, or IOMMU boundary.\nC:H - attr_data_len is attacker-controlled (up to 65535) and is used as a memcpy length without bounding to the IE, so the copy reads far past the WPS IE into kernel heap and the resulting stack smash can be leveraged for further disclosure.\nI:H - rtw_get_wps_attr_content() memcpy’s the claimed payload into a 1-byte stack variable (u8 sr/selected_registrar) using the unchecked length, producing an attacker-sized stack overflow that can overwrite return addresses and enable kernel code execution.\nA:H - A multi-kilobyte (or wrapped near-4GB) stack smash in the scan/BSS-inform path trips stack canaries or corrupts kernel control data and causes an oops, panic, or hang of the victim device." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/staging/rtl8723bs/core/rtw_ieee80211.c" ], "versions": [ { "version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b", "lessThan": "931640dfcb8cfa08f6cfb46229716d8072356420", "status": "affected", "versionType": "git" }, { "version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b", "lessThan": "3a6457ebf39080b87c712657fdb38f34a24fc3ff", "status": "affected", "versionType": "git" }, { "version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b", "lessThan": "fd5e24ea8373347d0352f153a66e8647337d1b10", "status": "affected", "versionType": "git" }, { "version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b", "lessThan": "a53d1ac9ce63db07943b2b2248111003851fb00f", "status": "affected", "versionType": "git" }, { "version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b", "lessThan": "ff61aa3289355dafa811550a1764691cd1f5d33b", "status": "affected", "versionType": "git" }, { "version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b", "lessThan": "34f51d196c43a42046d229de5e79025d5ca553ca", "status": "affected", "versionType": "git" }, { "version": "554c0a3abf216c991c5ebddcdb2c08689ecd290b", "lessThan": "99aa998dec83ba180822f70e6d48a514fc81c20d", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/staging/rtl8723bs/core/rtw_ieee80211.c" ], "versions": [ { "version": "4.12", "status": "affected" }, { "version": "0", "lessThan": "4.12", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.51", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.5", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "6.12.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "6.18.51" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "7.2.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/931640dfcb8cfa08f6cfb46229716d8072356420" }, { "url": "https://git.kernel.org/stable/c/3a6457ebf39080b87c712657fdb38f34a24fc3ff" }, { "url": "https://git.kernel.org/stable/c/fd5e24ea8373347d0352f153a66e8647337d1b10" }, { "url": "https://git.kernel.org/stable/c/a53d1ac9ce63db07943b2b2248111003851fb00f" }, { "url": "https://git.kernel.org/stable/c/ff61aa3289355dafa811550a1764691cd1f5d33b" }, { "url": "https://git.kernel.org/stable/c/34f51d196c43a42046d229de5e79025d5ca553ca" }, { "url": "https://git.kernel.org/stable/c/99aa998dec83ba180822f70e6d48a514fc81c20d" } ], "title": "staging: rtl8723bs: fix OOB read / stack overflow in rtw_get_wps_attr()", "x_generator": { "engine": "bippy-1.2.0" } } } }