{"id":"CVE-2026-63869","revision":null,"records":[{"revision":"6e87ff05609e48738350493e0a434385","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-63869","aliases":[],"title":"wifi: mac80211: limit injected antenna index in ieee80211_parse_tx_radiotap","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: limit injected antenna index in ieee80211_parse_tx_radiotap\n\nWhen parsing the radiotap header of an injected frame,\nieee80211_parse_tx_radiotap() uses the IEEE80211_RADIOTAP_ANTENNA value\ndirectly as a shift count:\n\n\tinfo->control.antennas |= BIT(*iterator.this_arg);\n\n*iterator.this_arg is an 8-bit value taken straight from the frame\nsupplied by userspace, so BIT() can be asked to shift by up to 255. That\nis undefined behaviour on the unsigned long and is reported by UBSAN:\n\n UBSAN: shift-out-of-bounds in net/mac80211/tx.c:2174:30\n shift exponent 235 is too large for 64-bit type 'unsigned long'\n Call Trace:\n ieee80211_parse_tx_radiotap+0xadb/0x1950 net/mac80211/tx.c:2174\n ieee80211_monitor_start_xmit+0xb1f/0x1250 net/mac80211/tx.c:2451\n ...\n packet_sendmsg+0x3eb6/0x50f0 net/packet/af_packet.c:3109\n\ninfo->control.antennas is a 2-bit bitmap (u8 antennas:2), so only antenna\nindices 0 and 1 can ever be represented. Ignore any larger value instead\nof shifting out of bounds.","state":0,"publishedAt":"2026-07-19T14:18:38.426+00:00","modifiedAt":"2026-10-19T20:17:53.439+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 \"net/mac80211/tx.c\"\n ],\n \"versions\": [\n {\n \"version\": \"ef246a1480cc484cd2aeda75737cb0848616ddf3\",\n \"lessThan\": \"f6d3dc8e8492bf8435e0b23c99472af7bafd6b44\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ef246a1480cc484cd2aeda75737cb0848616ddf3\",\n \"lessThan\": \"9b40c59bab08f2a99abf969cc0bb92fa49de004b\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ef246a1480cc484cd2aeda75737cb0848616ddf3\",\n \"lessThan\": \"033ce021a220913ac02416fcb5ac883a9ff8b6c7\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ef246a1480cc484cd2aeda75737cb0848616ddf3\",\n \"lessThan\": \"6c0cf89f36ac0c0fd8687a4ccdce2efb23a9c663\",\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 \"net/mac80211/tx.c\"\n ],\n \"versions\": [\n {\n \"version\": \"6.7\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"6.7\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.94\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.36\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.0.13\",\n \"lessThanOrEqual\": \"7.0.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1\",\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:L/UI:N/S:U/C:H/I:H/A:L","score":7.6,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/f6d3dc8e8492bf8435e0b23c99472af7bafd6b44","https://git.kernel.org/stable/c/9b40c59bab08f2a99abf969cc0bb92fa49de004b","https://git.kernel.org/stable/c/033ce021a220913ac02416fcb5ac883a9ff8b6c7","https://git.kernel.org/stable/c/6c0cf89f36ac0c0fd8687a4ccdce2efb23a9c663"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-63869","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-63869","identifiers":["CVE-2026-63869"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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