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CVE-2026-63869

Estado: Pendiente de análisisAlta (7.6)—

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:

*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:

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.

Detalles técnicos trazas, registros y código del informe original
	info->control.antennas |= BIT(*iterator.this_arg);

  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

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

AV:A/PR:L requiere red adyacente y privilegios locales; shift-out-of-bounds puede causar DoS del kernel; no hay evidencia explícita de ejecución de código o acceso a datos.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Vulnerability ScanningThreat Intelligence ProgramPrivileged Account ManagementNetwork SegmentationFilter Network TrafficDisable or Remove Feature or Program

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-63869",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.6,
          "attackVector": "ADJACENT_NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "LOW",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.5,
        "exploitabilityScore": 2.1
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "ef246a1480cc484cd2aeda75737cb0848616ddf3",
              "lessThan": "f6d3dc8e8492bf8435e0b23c99472af7bafd6b44",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ef246a1480cc484cd2aeda75737cb0848616ddf3",
              "lessThan": "9b40c59bab08f2a99abf969cc0bb92fa49de004b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ef246a1480cc484cd2aeda75737cb0848616ddf3",
              "lessThan": "033ce021a220913ac02416fcb5ac883a9ff8b6c7",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ef246a1480cc484cd2aeda75737cb0848616ddf3",
              "lessThan": "6c0cf89f36ac0c0fd8687a4ccdce2efb23a9c663",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "net/mac80211/tx.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.7"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.7",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.12.94",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.36",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.0.13",
              "versionType": "semver",
              "lessThanOrEqual": "7.0.*"
            },
            {
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/mac80211/tx.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-07-19T15:16:53.873",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/033ce021a220913ac02416fcb5ac883a9ff8b6c7",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6c0cf89f36ac0c0fd8687a4ccdce2efb23a9c663",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9b40c59bab08f2a99abf969cc0bb92fa49de004b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f6d3dc8e8492bf8435e0b23c99472af7bafd6b44",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Awaiting Analysis",
  "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."
    }
  ],
  "lastModified": "2026-07-27T17:44:23.777",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}