{"api_version":"1","generated_at":"2026-07-23T19:00:34+00:00","cve":"CVE-2026-63869","urls":{"html":"https://cve.report/CVE-2026-63869","api":"https://cve.report/api/cve/CVE-2026-63869.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-63869","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-63869"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 15:16:53","updated_at":"2026-07-20 15:16:52"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.6","severity":"HIGH","vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L","baseScore":7.6,"baseSeverity":"HIGH","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"LOW"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.6","severity":"HIGH","vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L","data":{"baseScore":7.6,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/f6d3dc8e8492bf8435e0b23c99472af7bafd6b44","name":"https://git.kernel.org/stable/c/f6d3dc8e8492bf8435e0b23c99472af7bafd6b44","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/033ce021a220913ac02416fcb5ac883a9ff8b6c7","name":"https://git.kernel.org/stable/c/033ce021a220913ac02416fcb5ac883a9ff8b6c7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9b40c59bab08f2a99abf969cc0bb92fa49de004b","name":"https://git.kernel.org/stable/c/9b40c59bab08f2a99abf969cc0bb92fa49de004b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6c0cf89f36ac0c0fd8687a4ccdce2efb23a9c663","name":"https://git.kernel.org/stable/c/6c0cf89f36ac0c0fd8687a4ccdce2efb23a9c663","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-63869","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63869","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ef246a1480cc484cd2aeda75737cb0848616ddf3 f6d3dc8e8492bf8435e0b23c99472af7bafd6b44 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ef246a1480cc484cd2aeda75737cb0848616ddf3 9b40c59bab08f2a99abf969cc0bb92fa49de004b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ef246a1480cc484cd2aeda75737cb0848616ddf3 033ce021a220913ac02416fcb5ac883a9ff8b6c7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ef246a1480cc484cd2aeda75737cb0848616ddf3 6c0cf89f36ac0c0fd8687a4ccdce2efb23a9c663 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.7","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.7 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.94 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.36 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.13 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"63869","cve":"CVE-2026-63869","epss":"0.001570000","percentile":"0.052450000","score_date":"2026-07-20","updated_at":"2026-07-21 00:13:14"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/mac80211/tx.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"f6d3dc8e8492bf8435e0b23c99472af7bafd6b44","status":"affected","version":"ef246a1480cc484cd2aeda75737cb0848616ddf3","versionType":"git"},{"lessThan":"9b40c59bab08f2a99abf969cc0bb92fa49de004b","status":"affected","version":"ef246a1480cc484cd2aeda75737cb0848616ddf3","versionType":"git"},{"lessThan":"033ce021a220913ac02416fcb5ac883a9ff8b6c7","status":"affected","version":"ef246a1480cc484cd2aeda75737cb0848616ddf3","versionType":"git"},{"lessThan":"6c0cf89f36ac0c0fd8687a4ccdce2efb23a9c663","status":"affected","version":"ef246a1480cc484cd2aeda75737cb0848616ddf3","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/mac80211/tx.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.7"},{"lessThan":"6.7","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.94","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.36","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.13","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.94","versionStartIncluding":"6.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.36","versionStartIncluding":"6.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.13","versionStartIncluding":"6.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"6.7","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"metrics":[{"cvssV3_1":{"baseScore":7.6,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-07-20T13:41:02.356Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/f6d3dc8e8492bf8435e0b23c99472af7bafd6b44"},{"url":"https://git.kernel.org/stable/c/9b40c59bab08f2a99abf969cc0bb92fa49de004b"},{"url":"https://git.kernel.org/stable/c/033ce021a220913ac02416fcb5ac883a9ff8b6c7"},{"url":"https://git.kernel.org/stable/c/6c0cf89f36ac0c0fd8687a4ccdce2efb23a9c663"}],"title":"wifi: mac80211: limit injected antenna index in ieee80211_parse_tx_radiotap","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-63869","datePublished":"2026-07-19T14:18:38.426Z","dateReserved":"2026-07-19T07:54:57.017Z","dateUpdated":"2026-07-20T13:41:02.356Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-19 15:16:53","lastModifiedDate":"2026-07-20 15:16:52","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L","baseScore":7.6,"baseSeverity":"HIGH","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"LOW"},"exploitabilityScore":2.1,"impactScore":5.5}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"63869","Ordinal":"1","Title":"wifi: mac80211: limit injected antenna index in ieee80211_parse_","CVE":"CVE-2026-63869","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"63869","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"wifi: mac80211: limit injected antenna index in ieee80211_parse_"}]}}}