CVE-2026-63869 (GCVE-0-2026-63869)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:18 – Updated: 2026-07-20 13:41
VLAI
Title
wifi: mac80211: limit injected antenna index in ieee80211_parse_tx_radiotap
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: limit injected antenna index in ieee80211_parse_tx_radiotap When parsing the radiotap header of an injected frame, ieee80211_parse_tx_radiotap() uses the IEEE80211_RADIOTAP_ANTENNA value directly as a shift count: info->control.antennas |= BIT(*iterator.this_arg); *iterator.this_arg is an 8-bit value taken straight from the frame supplied by userspace, so BIT() can be asked to shift by up to 255. That is undefined behaviour on the unsigned long and is reported by UBSAN: UBSAN: shift-out-of-bounds in net/mac80211/tx.c:2174:30 shift exponent 235 is too large for 64-bit type 'unsigned long' Call Trace: ieee80211_parse_tx_radiotap+0xadb/0x1950 net/mac80211/tx.c:2174 ieee80211_monitor_start_xmit+0xb1f/0x1250 net/mac80211/tx.c:2451 ... packet_sendmsg+0x3eb6/0x50f0 net/packet/af_packet.c:3109 info->control.antennas is a 2-bit bitmap (u8 antennas:2), so only antenna indices 0 and 1 can ever be represented. Ignore any larger value instead of shifting out of bounds.
Severity
7.6 (High)
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ef246a1480cc484cd2aeda75737cb0848616ddf3 , < f6d3dc8e8492bf8435e0b23c99472af7bafd6b44 (git)
Affected: ef246a1480cc484cd2aeda75737cb0848616ddf3 , < 9b40c59bab08f2a99abf969cc0bb92fa49de004b (git)
Affected: ef246a1480cc484cd2aeda75737cb0848616ddf3 , < 033ce021a220913ac02416fcb5ac883a9ff8b6c7 (git)
Affected: ef246a1480cc484cd2aeda75737cb0848616ddf3 , < 6c0cf89f36ac0c0fd8687a4ccdce2efb23a9c663 (git)
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Linux Linux Affected: 6.7
Unaffected: 0 , < 6.7 (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "net/mac80211/tx.c"
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          "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-\u003econtrol.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 \u0027unsigned long\u0027\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-\u003econtrol.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."
        }
      ],
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L",
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      "providerMetadata": {
        "dateUpdated": "2026-07-20T13:41:02.356Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/6c0cf89f36ac0c0fd8687a4ccdce2efb23a9c663"
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    "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",
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      "date": "2026-07-21",
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  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.