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        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
        "title": "Terms of Use"
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        "summary": "Canonical URL",
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          "date": "2026-04-22T14:16:00Z",
          "number": "1",
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    "title": "Security update on CVE-2026-31503"
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          "category": "description",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nudp: Fix wildcard bind conflict check when using hash2\n\nWhen binding a udp_sock to a local address and port, UDP uses\ntwo hashes (udptable->hash and udptable->hash2) for collision\ndetection. The current code switches to \"hash2\" when\nhslot->count > 10.\n\n\"hash2\" is keyed by local address and local port.\n\"hash\" is keyed by local port only.\n\nThe issue can be shown in the following bind sequence (pseudo code):\n\nbind(fd1,  \"[fd00::1]:8888\")\nbind(fd2,  \"[fd00::2]:8888\")\nbind(fd3,  \"[fd00::3]:8888\")\nbind(fd4,  \"[fd00::4]:8888\")\nbind(fd5,  \"[fd00::5]:8888\")\nbind(fd6,  \"[fd00::6]:8888\")\nbind(fd7,  \"[fd00::7]:8888\")\nbind(fd8,  \"[fd00::8]:8888\")\nbind(fd9,  \"[fd00::9]:8888\")\nbind(fd10, \"[fd00::10]:8888\")\n\n/* Correctly return -EADDRINUSE because \"hash\" is used\n * instead of \"hash2\". udp_lib_lport_inuse() detects the\n * conflict.\n */\nbind(fail_fd, \"[::]:8888\")\n\n/* After one more socket is bound to \"[fd00::11]:8888\",\n * hslot->count exceeds 10 and \"hash2\" is used instead.\n */\nbind(fd11, \"[fd00::11]:8888\")\nbind(fail_fd, \"[::]:8888\")      /* succeeds unexpectedly */\n\nThe same issue applies to the IPv4 wildcard address \"0.0.0.0\"\nand the IPv4-mapped wildcard address \"::ffff:0.0.0.0\". For\nexample, if there are existing sockets bound to\n\"192.168.1.[1-11]:8888\", then binding \"0.0.0.0:8888\" or\n\"[::ffff:0.0.0.0]:8888\" can also miss the conflict when\nhslot->count > 10.\n\nTCP inet_csk_get_port() already has the correct check in\ninet_use_bhash2_on_bind(). Rename it to\ninet_use_hash2_on_bind() and move it to inet_hashtables.h\nso udp.c can reuse it in this fix.",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-31503"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/0a360f7f73a06ac88f18917055fbcc79694252d7",
          "url": "https://git.kernel.org/stable/c/0a360f7f73a06ac88f18917055fbcc79694252d7"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/18d84c45def3671d5c89fbdd5d4ab8a3217fe4b4",
          "url": "https://git.kernel.org/stable/c/18d84c45def3671d5c89fbdd5d4ab8a3217fe4b4"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/2297e38114316b26ae02f2d205c49b5511c5ed55",
          "url": "https://git.kernel.org/stable/c/2297e38114316b26ae02f2d205c49b5511c5ed55"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/d6ace0dbcbb7fd285738bb87b42b71b01858c952",
          "url": "https://git.kernel.org/stable/c/d6ace0dbcbb7fd285738bb87b42b71b01858c952"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/e537dd15d0d4ad989d56a1021290f0c674dd8b28",
          "url": "https://git.kernel.org/stable/c/e537dd15d0d4ad989d56a1021290f0c674dd8b28"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/f1bed05a832ae79be5f7a105da56810eaa59a5f1",
          "url": "https://git.kernel.org/stable/c/f1bed05a832ae79be5f7a105da56810eaa59a5f1"
        },
        {
          "category": "external",
          "summary": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html",
          "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
        },
        {
          "category": "external",
          "summary": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html",
          "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
        }
      ],
      "release_date": "2026-04-22T14:16:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-07-24T15:31:06.772475Z",
          "details": "This is a local-only logic flaw in UDP port-binding that does not grant code execution or data access; the impact is limited to availability by allowing a wildcard bind to succeed when it should return EADDRINUSE. Exploitation requires an unusual, non-default setup with more than 10 existing same-port UDP binds on distinct local addresses within a single network namespace, and disrupting well-known services on ports below 1024 additionally requires CAP_NET_BIND_SERVICE. Because effects are confined to the local namespace and hinge on this specific binding pattern, it is reasonable to treat this as low priority in centrally managed VM/server environments.",
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        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
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          "category": "impact",
          "details": "Moderate"
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}