CVE-2026-43411 (GCVE-0-2026-43411)
Vulnerability from cvelistv5
Published
2026-05-08 14:21
Modified
2026-05-11 22:24
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: tipc: fix divide-by-zero in tipc_sk_filter_connect() A user can set conn_timeout to any value via setsockopt(TIPC_CONN_TIMEOUT), including values less than 4. When a SYN is rejected with TIPC_ERR_OVERLOAD and the retry path in tipc_sk_filter_connect() executes: delay %= (tsk->conn_timeout / 4); If conn_timeout is in the range [0, 3], the integer division yields 0, and the modulo operation triggers a divide-by-zero exception, causing a kernel oops/panic. Fix this by clamping conn_timeout to a minimum of 4 at the point of use in tipc_sk_filter_connect(). Oops: divide error: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 119 Comm: poc-F144 Not tainted 7.0.0-rc2+ RIP: 0010:tipc_sk_filter_rcv (net/tipc/socket.c:2236 net/tipc/socket.c:2362) Call Trace: tipc_sk_backlog_rcv (include/linux/instrumented.h:82 include/linux/atomic/atomic-instrumented.h:32 include/net/sock.h:2357 net/tipc/socket.c:2406) __release_sock (include/net/sock.h:1185 net/core/sock.c:3213) release_sock (net/core/sock.c:3797) tipc_connect (net/tipc/socket.c:2570) __sys_connect (include/linux/file.h:62 include/linux/file.h:83 net/socket.c:2098)
References
Impacted products
Vendor Product Version
Linux Linux Version: 6787927475e52f6933e3affce365dabb2aa2fadf
Version: 6787927475e52f6933e3affce365dabb2aa2fadf
Version: 6787927475e52f6933e3affce365dabb2aa2fadf
Version: 6787927475e52f6933e3affce365dabb2aa2fadf
Version: 6787927475e52f6933e3affce365dabb2aa2fadf
Version: 6787927475e52f6933e3affce365dabb2aa2fadf
Version: 6787927475e52f6933e3affce365dabb2aa2fadf
Version: 6787927475e52f6933e3affce365dabb2aa2fadf
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/tipc/socket.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "4.20"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "version": "5.10.253",
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              "status": "unaffected",
              "version": "6.1.167",
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              "lessThanOrEqual": "6.18.*",
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              "version": "6.18.19",
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              "version": "6.19.9",
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              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
        {
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              "negate": false,
              "operator": "OR"
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          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: fix divide-by-zero in tipc_sk_filter_connect()\n\nA user can set conn_timeout to any value via\nsetsockopt(TIPC_CONN_TIMEOUT), including values less than 4.  When a\nSYN is rejected with TIPC_ERR_OVERLOAD and the retry path in\ntipc_sk_filter_connect() executes:\n\n    delay %= (tsk-\u003econn_timeout / 4);\n\nIf conn_timeout is in the range [0, 3], the integer division yields 0,\nand the modulo operation triggers a divide-by-zero exception, causing a\nkernel oops/panic.\n\nFix this by clamping conn_timeout to a minimum of 4 at the point of use\nin tipc_sk_filter_connect().\n\nOops: divide error: 0000 [#1] SMP KASAN NOPTI\nCPU: 0 UID: 0 PID: 119 Comm: poc-F144 Not tainted 7.0.0-rc2+\nRIP: 0010:tipc_sk_filter_rcv (net/tipc/socket.c:2236 net/tipc/socket.c:2362)\nCall Trace:\n tipc_sk_backlog_rcv (include/linux/instrumented.h:82 include/linux/atomic/atomic-instrumented.h:32 include/net/sock.h:2357 net/tipc/socket.c:2406)\n __release_sock (include/net/sock.h:1185 net/core/sock.c:3213)\n release_sock (net/core/sock.c:3797)\n tipc_connect (net/tipc/socket.c:2570)\n __sys_connect (include/linux/file.h:62 include/linux/file.h:83 net/socket.c:2098)"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:24:04.295Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/600feb0a66a98c6b7f6f02b5f3612e75f9b8540f"
        },
        {
          "url": "https://git.kernel.org/stable/c/3bc9998041076ee05d3f312a22cee6b2ca35527f"
        },
        {
          "url": "https://git.kernel.org/stable/c/579956f9f297eb1b6a5d24de313f3acccee1f9d5"
        },
        {
          "url": "https://git.kernel.org/stable/c/a360d3815aae1f00dd71b7714a846482e85cc1f7"
        },
        {
          "url": "https://git.kernel.org/stable/c/c2ebfbe63deb7bfd4dc2532bae62a7ed67713272"
        },
        {
          "url": "https://git.kernel.org/stable/c/2754e7b3d64748643df867d1ea6fec522914b635"
        },
        {
          "url": "https://git.kernel.org/stable/c/338c5edeb6ae3f12a4b84dff9d71f6f7f8c202c3"
        },
        {
          "url": "https://git.kernel.org/stable/c/6c5a9baa15de240e747263aba435a0951da8d8d2"
        }
      ],
      "title": "tipc: fix divide-by-zero in tipc_sk_filter_connect()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43411",
    "datePublished": "2026-05-08T14:21:49.543Z",
    "dateReserved": "2026-05-01T14:12:56.008Z",
    "dateUpdated": "2026-05-11T22:24:04.295Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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