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CVE-2026-23459

Estado: ModificadaAlta (8.2)—

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

ip_tunnel: adapt iptunnel_xmit_stats() to NETDEV_PCPU_STAT_DSTATS

Blamed commits forgot that vxlan/geneve use udp_tunnel[6]_xmit_skb() which call iptunnel_xmit_stats().

iptunnel_xmit_stats() was assuming tunnels were only using NETDEV_PCPU_STAT_TSTATS.

@syncp offset in pcpu_sw_netstats and pcpu_dstats is different.

32bit kernels would either have corruptions or freezes if the syncp sequence was overwritten.

This patch also moves pcpu_stat_type closer to dev->{t,d}stats to avoid a potential cache line miss since iptunnel_xmit_stats() needs to read it.

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.

Vulnerabilidad en kernel Linux con acceso en red sin autenticación (AV:N/PR:N) que causa DoS (A:H) e integridad de datos (I:L) mediante corrupción de memoria en sincronización de estadísticas de túneles VXLAN/GENEVE.

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 TrafficVulnerability ScanningRestrict File and Directory PermissionsPrivileged Account ManagementRemote Data StorageNetwork Segmentation

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-23459",
  "cveTags": [],
  "metrics": {
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        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
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          "version": "3.1",
          "baseScore": 8.2,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
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          "programFiles": [
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  "published": "2026-04-03T16:16:32.833",
  "references": [
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  "descriptions": [
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nip_tunnel: adapt iptunnel_xmit_stats() to NETDEV_PCPU_STAT_DSTATS\n\nBlamed commits forgot that vxlan/geneve use udp_tunnel[6]_xmit_skb() which\ncall iptunnel_xmit_stats().\n\niptunnel_xmit_stats() was assuming tunnels were only using\nNETDEV_PCPU_STAT_TSTATS.\n\n@syncp offset in pcpu_sw_netstats and pcpu_dstats is different.\n\n32bit kernels would either have corruptions or freezes if the syncp\nsequence was overwritten.\n\nThis patch also moves pcpu_stat_type closer to dev->{t,d}stats to avoid\na potential cache line miss since iptunnel_xmit_stats() needs to read it."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nip_tunnel: adaptar iptunnel_xmit_stats() a NETDEV_PCPU_STAT_DSTATS\n\nLos commits culpables olvidaron que vxlan/geneve usan udp_tunnel[6]_xmit_skb() que llama a iptunnel_xmit_stats().\n\niptunnel_xmit_stats() asumía que los túneles solo usaban NETDEV_PCPU_STAT_TSTATS.\n\nEl desplazamiento @syncp en pcpu_sw_netstats y pcpu_dstats es diferente.\n\nLos kernels de 32 bits tendrían o bien corrupciones o congelamientos si la secuencia syncp era sobrescrita.\n\nEste parche también mueve pcpu_stat_type más cerca de dev -> {t,d}stats para evitar una posible pérdida de línea de caché ya que iptunnel_xmit_stats() necesita leerlo."
    }
  ],
  "lastModified": "2026-09-07T16:17:27.923",
  "configurations": [
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