CVE-2026-81002

Estado: RecibidaCrítica (9.8)—

In the Linux kernel, the following vulnerability has been resolved:

xdp: fix zero-copy frame layout

xdp_convert_zc_to_xdp_frame() clones an XSK packet into an order-0 page and advertises PAGE_SIZE as its frame size. It allows the copied frame to occupy the page tail needed by skb_shared_info and records zero headroom even when metadata separates the frame header from packet data. An AF_XDP zero-copy packet redirected through cpumap can therefore make the skb overlap skb_shared_info or place it beyond the allocated page.

Limit the copied layout to SKB_WITH_OVERHEAD(PAGE_SIZE) and include the metadata length in frame headroom. Redirect callers already handle a NULL conversion result.

Leer descripción completaMostrar menos

BUG: KASAN: slab-out-of-bounds in skb_gro_receive Write of size 4 at addr ffff88800cf37004 by task cpumap/1/map:1/146 Call Trace: skb_gro_receive (net/core/gro.c:174) udp_gro_receive (net/ipv4/udp_offload.c:812) inet_gro_receive (net/ipv4/af_inet.c:1539) dev_gro_receive (net/core/gro.c:515) gro_receive_skb (net/core/gro.c:633) cpu_map_kthread_run (kernel/bpf/cpumap.c:395) kthread (kernel/kthread.c:436) ret_from_fork (arch/x86/kernel/process.c:164) ret_from_fork_asm (arch/x86/entry/entry_64.S:255) Kernel panic - not syncing: KASAN: panic_on_warn set ...

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 9.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.51%
Percentil entre todas las CVEs puntuadas: 42
Fecha de la puntuación: 5/10/2026

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.

ExplotaciónT1190 Exploit Public-Facing Applicationinitial access75 %
Impacto principalT1499.004 Application or System Exploitationimpact70 %
Impacto secundarioT1068 Exploitation for Privilege Escalationprivilege escalation65 %

Vulnerabilidad de red remota (AV:N, PR:N, UI:N) en kernel Linux explotable sin privilegios. Impactos: DoS por corrupción de memoria (slab-out-of-bounds, kernel panic) y potencial escalada local (KASAN puede ser aprovechado).

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

Filter Network Traffic Application Isolation and Sandboxing Exploit Protection Update Software Vulnerability Scanning Threat Intelligence 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 Kernel^AI

Referencias

JSON original (NVD)

Mostrar

{
  "id": "CVE-2026-81002",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 9.8,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "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": "b0d1beeff2a97a0cf1965ea8f1d13b8973f22582",
              "lessThan": "dcb6db9ca6515fcd3e00c93ec5e27dc7a0a7012f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b0d1beeff2a97a0cf1965ea8f1d13b8973f22582",
              "lessThan": "22092730129077c302d8c947bbe0876f0280c528",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b0d1beeff2a97a0cf1965ea8f1d13b8973f22582",
              "lessThan": "ced3e18cd9b9caf630aaa1e1eac305f5192ba896",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b0d1beeff2a97a0cf1965ea8f1d13b8973f22582",
              "lessThan": "6de17275b3ccdf9887568b07e54da2e3597217cf",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b0d1beeff2a97a0cf1965ea8f1d13b8973f22582",
              "lessThan": "444216dacdbebd3e52d5e704facafbb230da09e9",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b0d1beeff2a97a0cf1965ea8f1d13b8973f22582",
              "lessThan": "15d1f3c0dbe7a740f779337deb39f23cd8d002c8",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b0d1beeff2a97a0cf1965ea8f1d13b8973f22582",
              "lessThan": "68d7cc5512238693670fc19c7a615df631e10edf",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b0d1beeff2a97a0cf1965ea8f1d13b8973f22582",
              "lessThan": "71283aaa6c65b3cec84caf1dc78560985737641f",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "net/core/xdp.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.20"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "4.20",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/core/xdp.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-11T20:19:08.483",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/15d1f3c0dbe7a740f779337deb39f23cd8d002c8",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/22092730129077c302d8c947bbe0876f0280c528",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/444216dacdbebd3e52d5e704facafbb230da09e9",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/68d7cc5512238693670fc19c7a615df631e10edf",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/6de17275b3ccdf9887568b07e54da2e3597217cf",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/71283aaa6c65b3cec84caf1dc78560985737641f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ced3e18cd9b9caf630aaa1e1eac305f5192ba896",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/dcb6db9ca6515fcd3e00c93ec5e27dc7a0a7012f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxdp: fix zero-copy frame layout\n\nxdp_convert_zc_to_xdp_frame() clones an XSK packet into an order-0 page\nand advertises PAGE_SIZE as its frame size.  It allows the copied frame\nto occupy the page tail needed by skb_shared_info and records zero\nheadroom even when metadata separates the frame header from packet data.\nAn AF_XDP zero-copy packet redirected through cpumap can therefore make\nthe skb overlap skb_shared_info or place it beyond the allocated page.\n\nLimit the copied layout to SKB_WITH_OVERHEAD(PAGE_SIZE) and include the\nmetadata length in frame headroom.  Redirect callers already handle a\nNULL conversion result.\n\nBUG: KASAN: slab-out-of-bounds in skb_gro_receive\nWrite of size 4 at addr ffff88800cf37004 by task cpumap/1/map:1/146\nCall Trace:\n skb_gro_receive (net/core/gro.c:174)\n udp_gro_receive (net/ipv4/udp_offload.c:812)\n inet_gro_receive (net/ipv4/af_inet.c:1539)\n dev_gro_receive (net/core/gro.c:515)\n gro_receive_skb (net/core/gro.c:633)\n cpu_map_kthread_run (kernel/bpf/cpumap.c:395)\n kthread (kernel/kthread.c:436)\n ret_from_fork (arch/x86/kernel/process.c:164)\n ret_from_fork_asm (arch/x86/entry/entry_64.S:255)\nKernel panic - not syncing: KASAN: panic_on_warn set ..."
    }
  ],
  "lastModified": "2026-09-14T13:18:54.553",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}