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CVE-2026-97614

Estado: RecibidaSin puntuar—

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

net: dsa: tag_brcm: legacy FCS: request needed tailroom

The legacy FCS tagger calculates the CRC over skb->len bytes starting at skb->data. When a nonlinear skb reaches the tagger, this reads past the linear head into unrelated slab memory.

The tagger appends an Ethernet FCS but does not declare that tailroom. As a result, DSA leaves NETIF_F_SG and NETIF_F_FRAGLIST enabled on the user port, and nonlinear skbs can reach the CRC calculation.

Declare the required tailroom. DSA will then clear those features and the networking core will linearize skbs before the tagger runs.

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A KASAN-enabled dsa_loop test using this tagger reports:

Detalles técnicos trazas, registros y código del informe original
  BUG: KASAN: slab-out-of-bounds in crc32_le
  Read of size 1 at addr ffff8880397086c0 by task exp/135

  Call Trace:
   crc32_le (lib/crc/crc32-main.c:38)
   brcm_leg_fcs_tag_xmit (net/dsa/tag_brcm.c:343)
   dsa_user_xmit (net/dsa/user.c:942)
   dev_hard_start_xmit (net/core/dev.c:3937)
   __dev_queue_xmit (net/core/dev.c:4926)
   packet_sendmsg (net/packet/af_packet.c:3110)
   __sys_sendto (net/socket.c:2281)

  The buggy address belongs to the object at ffff888039708400
   which belongs to the cache skbuff_small_head of size 704
  The buggy address is located 0 bytes to the right of
   allocated 704-byte region [ffff888039708400, ffff8880397086c0)

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

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).

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-2026-97614",
  "cveTags": [],
  "metrics": {},
  "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": "ef07df397a621707903ef0d294a7df11f80cf206",
              "lessThan": "709451db123d90743fa9104b48f324a8e49f8c6f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ef07df397a621707903ef0d294a7df11f80cf206",
              "lessThan": "3eb5c7e1c154c74568620a25c6751bb8d6d8d728",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ef07df397a621707903ef0d294a7df11f80cf206",
              "lessThan": "5be081b83abd3f17d908953b4bb77279f5a149e3",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "net/dsa/tag_brcm.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.17"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.17",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc3",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/dsa/tag_brcm.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-25T11:17:15.563",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/3eb5c7e1c154c74568620a25c6751bb8d6d8d728",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/5be081b83abd3f17d908953b4bb77279f5a149e3",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/709451db123d90743fa9104b48f324a8e49f8c6f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: dsa: tag_brcm: legacy FCS: request needed tailroom\n\nThe legacy FCS tagger calculates the CRC over skb->len bytes starting at\nskb->data. When a nonlinear skb reaches the tagger, this reads past the\nlinear head into unrelated slab memory.\n\nThe tagger appends an Ethernet FCS but does not declare that tailroom. As a\nresult, DSA leaves NETIF_F_SG and NETIF_F_FRAGLIST enabled on the user\nport, and nonlinear skbs can reach the CRC calculation.\n\nDeclare the required tailroom. DSA will then clear those features and the\nnetworking core will linearize skbs before the tagger runs.\n\nA KASAN-enabled dsa_loop test using this tagger reports:\n\n  BUG: KASAN: slab-out-of-bounds in crc32_le\n  Read of size 1 at addr ffff8880397086c0 by task exp/135\n\n  Call Trace:\n   crc32_le (lib/crc/crc32-main.c:38)\n   brcm_leg_fcs_tag_xmit (net/dsa/tag_brcm.c:343)\n   dsa_user_xmit (net/dsa/user.c:942)\n   dev_hard_start_xmit (net/core/dev.c:3937)\n   __dev_queue_xmit (net/core/dev.c:4926)\n   packet_sendmsg (net/packet/af_packet.c:3110)\n   __sys_sendto (net/socket.c:2281)\n\n  The buggy address belongs to the object at ffff888039708400\n   which belongs to the cache skbuff_small_head of size 704\n  The buggy address is located 0 bytes to the right of\n   allocated 704-byte region [ffff888039708400, ffff8880397086c0)"
    }
  ],
  "lastModified": "2026-09-25T11:17:15.563",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}