FKIE_CVE-2026-68289

Vulnerability from fkie_nvd - Published: 2026-08-10 13:20 - Updated: 2026-08-17 05:18
Severity
Summary
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: copy = min_t(int, dlen - offset, buflen); 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. 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 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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/47f42ff521b4eeb46e82f9a46a4783a99f7570d7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fe9bf32bb18f2d35789d4960fb007d1059bbaa38
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/tipc/socket.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "fe9bf32bb18f2d35789d4960fb007d1059bbaa38",
              "status": "affected",
              "version": "e9f8b10101c6da3ab000a2fb17162374c9bd2c69",
              "versionType": "git"
            },
            {
              "lessThan": "47f42ff521b4eeb46e82f9a46a4783a99f7570d7",
              "status": "affected",
              "version": "e9f8b10101c6da3ab000a2fb17162374c9bd2c69",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/tipc/socket.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.12"
            },
            {
              "lessThan": "4.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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 \u003c= (dlen - offset), which is bounded\nby TIPC maximum message size (0x1ffff bytes), so the implicit\nnarrowing on assignment to int copy is always safe."
    }
  ],
  "id": "CVE-2026-68289",
  "lastModified": "2026-08-17T05:18:31.567",
  "metrics": {},
  "published": "2026-08-10T13:20:18.233",
  "references": [
    {
      "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/fe9bf32bb18f2d35789d4960fb007d1059bbaa38"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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