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CVE-2026-68289

Estado: RecibidaSin puntuar—

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

tipc: fix integer overflow in tipc_recvmsg() and tipc_recvstream()

In tipc_recvmsg(), the copy length is computed as:

buflen is size_t but min_t(int, ...) casts it to int. When buflen exceeds INT_MAX (e.g. 0xFFFFFFFF via io_uring provided buffers), it wraps negative, wins the comparison, and the negative copy length propagates to simple_copy_to_iter() where int-to-size_t promotion makes it SIZE_MAX, triggering a WARN_ON. tipc_recvstream() has the same pattern.

Fix by changing min_t(int, ...) to min_t(size_t, ...) in both functions. The result is always <= (dlen - offset), which is bounded by TIPC maximum message size (0x1ffff bytes), so the implicit narrowing on assignment to int copy is always safe.

Detalles técnicos trazas, registros y código del informe original
  copy = min_t(int, dlen - offset, buflen);

  Kernel panic - not syncing: kernel: panic_on_warn set ...
  RIP: 0010:simple_copy_to_iter+0x9e/0xd0 (net/core/datagram.c:521)
  Call Trace:
   __skb_datagram_iter+0x123/0x8b0 (net/core/datagram.c:402)
   skb_copy_datagram_iter+0x77/0x1a0 (net/core/datagram.c:534)
   tipc_recvmsg+0x3d7/0xe80 (net/tipc/socket.c:1934)
   io_recvmsg+0x47e/0xda0

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)

Mostrar
{
  "id": "CVE-2026-68289",
  "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": "e9f8b10101c6da3ab000a2fb17162374c9bd2c69",
              "lessThan": "9fd4f92671146b068809b6c34b50346cb30cf8f7",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e9f8b10101c6da3ab000a2fb17162374c9bd2c69",
              "lessThan": "93580911f02d1f4a506ec0a6fc4354140c53ffe8",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e9f8b10101c6da3ab000a2fb17162374c9bd2c69",
              "lessThan": "1b6066313b9b8fac870483bf7a26d6bd56579747",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e9f8b10101c6da3ab000a2fb17162374c9bd2c69",
              "lessThan": "7364014fdc289225229eb08de8bcbf4580e78e4d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e9f8b10101c6da3ab000a2fb17162374c9bd2c69",
              "lessThan": "fe9bf32bb18f2d35789d4960fb007d1059bbaa38",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e9f8b10101c6da3ab000a2fb17162374c9bd2c69",
              "lessThan": "47f42ff521b4eeb46e82f9a46a4783a99f7570d7",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "net/tipc/socket.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.12"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "4.12",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/tipc/socket.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-10T13:20:18.233",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/1b6066313b9b8fac870483bf7a26d6bd56579747",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/47f42ff521b4eeb46e82f9a46a4783a99f7570d7",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7364014fdc289225229eb08de8bcbf4580e78e4d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/93580911f02d1f4a506ec0a6fc4354140c53ffe8",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9fd4f92671146b068809b6c34b50346cb30cf8f7",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/fe9bf32bb18f2d35789d4960fb007d1059bbaa38",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: fix integer overflow in tipc_recvmsg() and tipc_recvstream()\n\nIn tipc_recvmsg(), the copy length is computed as:\n\n  copy = min_t(int, dlen - offset, buflen);\n\nbuflen is size_t but min_t(int, ...) casts it to int. When buflen\nexceeds INT_MAX (e.g. 0xFFFFFFFF via io_uring provided buffers), it\nwraps negative, wins the comparison, and the negative copy length\npropagates to simple_copy_to_iter() where int-to-size_t promotion\nmakes it SIZE_MAX, triggering a WARN_ON. tipc_recvstream() has the\nsame pattern.\n\n  Kernel panic - not syncing: kernel: panic_on_warn set ...\n  RIP: 0010:simple_copy_to_iter+0x9e/0xd0 (net/core/datagram.c:521)\n  Call Trace:\n   __skb_datagram_iter+0x123/0x8b0 (net/core/datagram.c:402)\n   skb_copy_datagram_iter+0x77/0x1a0 (net/core/datagram.c:534)\n   tipc_recvmsg+0x3d7/0xe80 (net/tipc/socket.c:1934)\n   io_recvmsg+0x47e/0xda0\n\nFix by changing min_t(int, ...) to min_t(size_t, ...) in both\nfunctions. The result is always <= (dlen - offset), which is bounded\nby TIPC maximum message size (0x1ffff bytes), so the implicit\nnarrowing on assignment to int copy is always safe."
    }
  ],
  "lastModified": "2026-10-03T11:17:36.700",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}