{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64440","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-07-19T15:36:31.788Z","datePublished":"2026-07-25T08:51:13.138Z","dateUpdated":"2026-08-17T04:55:42.056Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T04:55:42.056Z"},"descriptions":[{"lang":"en","value":"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."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","baseScore":8.1,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:A - A nearby attacker can transmit a crafted 802.11 association response over the air; WiFi management-frame injection requires radio proximity and is not routable.\nAC:L - A malicious AP controls the IE length, contents, and handshake timing, making the bit-clearing overwrite deterministic without a race or uncontrollable condition.\nPR:N - The frame is processed before WPA or 802.1X credential verification, and OnAssocRsp does not authenticate its source BSSID; no target privilege or network credential is required.\nUI:N - Mobile, embedded, and headless systems commonly associate or roam automatically, allowing an evil-twin AP to reach the handler without human action.\nS:U - The corruption affects host-kernel driver state without crossing a VM, IOMMU, sandbox, or other security-authority boundary.\nC:N - The primitive only AND-clears following HT and network metadata and cannot reach pointer-bearing fields; no secret-bearing read or attacker-visible disclosure path was found.\nI:H - The oversized IE causes up to 229 attacker-controlled bit-mask writes beyond the 26-byte array, corrupting live kernel HT information and saved network metadata.\nA:H - The attacker can repeatedly corrupt BSSID, SSID, rate, IE-length, and HT state to prevent association; on a WiFi-dependent controller or IoT device this can sustain total loss of connectivity."}]}],"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_wlan_util.c"],"versions":[{"version":"554c0a3abf216c991c5ebddcdb2c08689ecd290b","lessThan":"37f642d47c3648a707df3ceb092eee1adffbfd28","status":"affected","versionType":"git"},{"version":"554c0a3abf216c991c5ebddcdb2c08689ecd290b","lessThan":"8c872b47c7fc32e95e0da1db7512388794adcd69","status":"affected","versionType":"git"},{"version":"554c0a3abf216c991c5ebddcdb2c08689ecd290b","lessThan":"bb3b942da4123b55d1cacf19d1a7d5ba15dbf83a","status":"affected","versionType":"git"},{"version":"554c0a3abf216c991c5ebddcdb2c08689ecd290b","lessThan":"918537a0fbed85aab61fa28ad75e6279070610c9","status":"affected","versionType":"git"},{"version":"554c0a3abf216c991c5ebddcdb2c08689ecd290b","lessThan":"6f91621fc45025ad3c0be796b70e6e4cee22fc69","status":"affected","versionType":"git"},{"version":"554c0a3abf216c991c5ebddcdb2c08689ecd290b","lessThan":"225b6d3fc7e99ac3d20b6c861d1e47d24e7ea31d","status":"affected","versionType":"git"},{"version":"554c0a3abf216c991c5ebddcdb2c08689ecd290b","lessThan":"f8001e1a516ba3b495728c65b61f799cbfad6bd0","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_wlan_util.c"],"versions":[{"version":"4.12","status":"affected"},{"version":"0","lessThan":"4.12","status":"unaffected","versionType":"semver"},{"version":"5.15.212","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.178","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.145","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.96","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.39","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.4","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","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":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"6.12.96"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"6.18.39"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"7.1.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.12","versionEndExcluding":"7.2"}]}]}],"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"}],"title":"staging: rtl8723bs: fix OOB write in HT_caps_handler()","x_generator":{"engine":"bippy-1.2.0"}}}}