Vulnerability-Lookup

CVE-2026-31503 (GCVE-0-2026-31503)

Vulnerability from cvelistv5 – Published: 2026-04-22 13:54 – Updated: 2026-09-08 08:47

Title

udp: Fix wildcard bind conflict check when using hash2

Summary

In the Linux kernel, the following vulnerability has been resolved: udp: Fix wildcard bind conflict check when using hash2 When binding a udp_sock to a local address and port, UDP uses two hashes (udptable->hash and udptable->hash2) for collision detection. The current code switches to "hash2" when hslot->count > 10. "hash2" is keyed by local address and local port. "hash" is keyed by local port only. The issue can be shown in the following bind sequence (pseudo code): bind(fd1, "[fd00::1]:8888") bind(fd2, "[fd00::2]:8888") bind(fd3, "[fd00::3]:8888") bind(fd4, "[fd00::4]:8888") bind(fd5, "[fd00::5]:8888") bind(fd6, "[fd00::6]:8888") bind(fd7, "[fd00::7]:8888") bind(fd8, "[fd00::8]:8888") bind(fd9, "[fd00::9]:8888") bind(fd10, "[fd00::10]:8888") /* Correctly return -EADDRINUSE because "hash" is used * instead of "hash2". udp_lib_lport_inuse() detects the * conflict. */ bind(fail_fd, "[::]:8888") /* After one more socket is bound to "[fd00::11]:8888", * hslot->count exceeds 10 and "hash2" is used instead. */ bind(fd11, "[fd00::11]:8888") bind(fail_fd, "[::]:8888") /* succeeds unexpectedly */ The same issue applies to the IPv4 wildcard address "0.0.0.0" and the IPv4-mapped wildcard address "::ffff:0.0.0.0". For example, if there are existing sockets bound to "192.168.1.[1-11]:8888", then binding "0.0.0.0:8888" or "[::ffff:0.0.0.0]:8888" can also miss the conflict when hslot->count > 10. TCP inet_csk_get_port() already has the correct check in inet_use_bhash2_on_bind(). Rename it to inet_use_hash2_on_bind() and move it to inet_hashtables.h so udp.c can reuse it in this fix.

Severity

5.5 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/d6ace0dbcbb7fd285…
https://git.kernel.org/stable/c/2297e38114316b26a…
https://git.kernel.org/stable/c/f1bed05a832ae79be…
https://git.kernel.org/stable/c/18d84c45def3671d5…
https://git.kernel.org/stable/c/0a360f7f73a06ac88…
https://git.kernel.org/stable/c/e537dd15d0d4ad989…
https://cert-portal.siemens.com/productcert/html/…
https://cert-portal.siemens.com/productcert/html/…

Impacted products

8 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: 30fff9231fad757c061285e347b33c5149c2c2e4 , < d6ace0dbcbb7fd285738bb87b42b71b01858c952 (git) Affected: 30fff9231fad757c061285e347b33c5149c2c2e4 , < 2297e38114316b26ae02f2d205c49b5511c5ed55 (git) Affected: 30fff9231fad757c061285e347b33c5149c2c2e4 , < f1bed05a832ae79be5f7a105da56810eaa59a5f1 (git) Affected: 30fff9231fad757c061285e347b33c5149c2c2e4 , < 18d84c45def3671d5c89fbdd5d4ab8a3217fe4b4 (git) Affected: 30fff9231fad757c061285e347b33c5149c2c2e4 , < 0a360f7f73a06ac88f18917055fbcc79694252d7 (git) Affected: 30fff9231fad757c061285e347b33c5149c2c2e4 , < e537dd15d0d4ad989d56a1021290f0c674dd8b28 (git)	guessed
Linux	Linux	Affected: 2.6.33 Unaffected: 0 , < 2.6.33 (semver) Unaffected: 6.1.168 , ≤ 6.1.* (semver) Unaffected: 6.6.131 , ≤ 6.6.* (semver) Unaffected: 6.12.80 , ≤ 6.12.* (semver) Unaffected: 6.18.21 , ≤ 6.18.* (semver) Unaffected: 6.19.11 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)	guessed
Siemens	SIMATIC S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.6 , < * (custom)	guessed
Siemens	SIMATIC S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.5 , < * (custom)	guessed
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP	Affected: V3.1.6 , < * (custom)	guessed
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP	Affected: V3.1.5 , < * (custom)	guessed
Siemens	SIPLUS S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.6 , < * (custom)	guessed
Siemens	SIPLUS S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.5 , < * (custom)	guessed

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The current code switches to \\\"hash2\\\" when\\nhslot-\u003ecount \u003e 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-\u003ecount 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-\u003ecount \u003e 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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"include/net/inet_hashtables.h\",\"net/ipv4/inet_connection_sock.c\",\"net/ipv4/udp.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"30fff9231fad757c061285e347b33c5149c2c2e4\",\"lessThan\":\"d6ace0dbcbb7fd285738bb87b42b71b01858c952\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"30fff9231fad757c061285e347b33c5149c2c2e4\",\"lessThan\":\"2297e38114316b26ae02f2d205c49b5511c5ed55\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"30fff9231fad757c061285e347b33c5149c2c2e4\",\"lessThan\":\"f1bed05a832ae79be5f7a105da56810eaa59a5f1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"30fff9231fad757c061285e347b33c5149c2c2e4\",\"lessThan\":\"18d84c45def3671d5c89fbdd5d4ab8a3217fe4b4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"30fff9231fad757c061285e347b33c5149c2c2e4\",\"lessThan\":\"0a360f7f73a06ac88f18917055fbcc79694252d7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"30fff9231fad757c061285e347b33c5149c2c2e4\",\"lessThan\":\"e537dd15d0d4ad989d56a1021290f0c674dd8b28\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"include/net/inet_hashtables.h\",\"net/ipv4/inet_connection_sock.c\",\"net/ipv4/udp.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.33\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.33\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.168\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.131\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.80\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.21\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19.11\",\"lessThanOrEqual\":\"6.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]},{\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\",\"affectedData\":[{\"vendor\":\"Siemens\",\"product\":\"SIMATIC 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-11T10:31:46+00:00",
      "cve": "CVE-2026-31503",
      "id": "CVE-2026-31503",
      "initial_release_date": "2026-04-22T00:00:00+00:00",
      "product_status:fixed": "309",
      "product_status:known_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: udp: Fix wildcard bind conflict check when using hash2",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31503.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-12T16:42:58Z",
      "cve": "CVE-2026-31503",
      "id": "CVE-2026-31503",
      "initial_release_date": "2026-04-23T01:25:17Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "725",
      "product_status:recommended": "319",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-31503",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-31503.json",
      "version": "16"
    }
  }
}

FKIE_CVE-2026-31503

Vulnerability from fkie_nvd - Published: 2026-04-22 14:16 - Updated: 2026-07-14 13:18

Severity

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0a360f7f73a06ac88f18917055fbcc79694252d7	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/18d84c45def3671d5c89fbdd5d4ab8a3217fe4b4	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2297e38114316b26ae02f2d205c49b5511c5ed55	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d6ace0dbcbb7fd285738bb87b42b71b01858c952	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e537dd15d0d4ad989d56a1021290f0c674dd8b28	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f1bed05a832ae79be5f7a105da56810eaa59a5f1	Patch
0b142b55-0307-4c5a-b3c9-f314f3fb7c5e	https://cert-portal.siemens.com/productcert/html/ssa-019113.html
0b142b55-0307-4c5a-b3c9-f314f3fb7c5e	https://cert-portal.siemens.com/productcert/html/ssa-082556.html

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	2.6.33
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

To clipboard

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              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "4CA2E747-A9EC-4518-9AA2-B4247FC748B7",
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            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:2.6.33:-:*:*:*:*:*:*",
              "matchCriteriaId": "EF818826-D9F2-42F9-9638-9609513561A3",
              "vulnerable": true
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              "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*",
              "matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6",
              "vulnerable": true
            },
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              "matchCriteriaId": "512EE3A8-A590-4501-9A94-5D4B268D6138",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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-\u003ehash and udptable-\u003ehash2) for collision\ndetection. The current code switches to \"hash2\" when\nhslot-\u003ecount \u003e 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-\u003ecount 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-\u003ecount \u003e 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."
    }
  ],
  "id": "CVE-2026-31503",
  "lastModified": "2026-07-14T13:18:43.710",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "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"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-04-22T14:16:48.863",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/0a360f7f73a06ac88f18917055fbcc79694252d7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/18d84c45def3671d5c89fbdd5d4ab8a3217fe4b4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/2297e38114316b26ae02f2d205c49b5511c5ed55"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/d6ace0dbcbb7fd285738bb87b42b71b01858c952"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/e537dd15d0d4ad989d56a1021290f0c674dd8b28"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/f1bed05a832ae79be5f7a105da56810eaa59a5f1"
    },
    {
      "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
    },
    {
      "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

GHSA-8G49-X5X5-4C9C

Vulnerability from github – Published: 2026-04-22 15:31 – Updated: 2026-07-14 15:31

Details

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

udp: Fix wildcard bind conflict check when using hash2

When binding a udp_sock to a local address and port, UDP uses two hashes (udptable->hash and udptable->hash2) for collision detection. The current code switches to "hash2" when hslot->count > 10.

"hash2" is keyed by local address and local port. "hash" is keyed by local port only.

The issue can be shown in the following bind sequence (pseudo code):

bind(fd1, "[fd00::1]:8888") bind(fd2, "[fd00::2]:8888") bind(fd3, "[fd00::3]:8888") bind(fd4, "[fd00::4]:8888") bind(fd5, "[fd00::5]:8888") bind(fd6, "[fd00::6]:8888") bind(fd7, "[fd00::7]:8888") bind(fd8, "[fd00::8]:8888") bind(fd9, "[fd00::9]:8888") bind(fd10, "[fd00::10]:8888")

/ Correctly return -EADDRINUSE because "hash" is used * instead of "hash2". udp_lib_lport_inuse() detects the * conflict. / bind(fail_fd, "[::]:8888")

/ After one more socket is bound to "[fd00::11]:8888", * hslot->count exceeds 10 and "hash2" is used instead. / bind(fd11, "[fd00::11]:8888") bind(fail_fd, "[::]:8888") / succeeds unexpectedly /

The same issue applies to the IPv4 wildcard address "0.0.0.0" and the IPv4-mapped wildcard address "::ffff:0.0.0.0". For example, if there are existing sockets bound to "192.168.1.[1-11]:8888", then binding "0.0.0.0:8888" or "[::ffff:0.0.0.0]:8888" can also miss the conflict when hslot->count > 10.

TCP inet_csk_get_port() already has the correct check in inet_use_bhash2_on_bind(). Rename it to inet_use_hash2_on_bind() and move it to inet_hashtables.h so udp.c can reuse it in this fix.

Severity

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-31503"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-22T14:16:48Z",
    "severity": "MODERATE"
  },
  "details": "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-\u003ehash and udptable-\u003ehash2) for collision\ndetection. The current code switches to \"hash2\" when\nhslot-\u003ecount \u003e 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-\u003ecount 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-\u003ecount \u003e 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.",
  "id": "GHSA-8g49-x5x5-4c9c",
  "modified": "2026-07-14T15:31:53Z",
  "published": "2026-04-22T15:31:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31503"
    },
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
    },
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0a360f7f73a06ac88f18917055fbcc79694252d7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/18d84c45def3671d5c89fbdd5d4ab8a3217fe4b4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2297e38114316b26ae02f2d205c49b5511c5ed55"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d6ace0dbcbb7fd285738bb87b42b71b01858c952"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e537dd15d0d4ad989d56a1021290f0c674dd8b28"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f1bed05a832ae79be5f7a105da56810eaa59a5f1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

ICSA-26-209-04

Vulnerability from csaf_cisa - Published: 2026-07-14 00:00 - Updated: 2026-07-28 06:00

Summary

Siemens SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP

Scope

352 vulnerabilities in this advisory, including CVE-2026-31503.

CVE-2026-31503

5.5 (Medium)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Known affected: 5 products

Open the full advisory

MSRC_CVE-2026-31503

Vulnerability from csaf_microsoft - Published: 2026-04-02 00:00 - Updated: 2026-04-30 01:12

Summary

udp: Fix wildcard bind conflict check when using hash2

Scope

1 vulnerability in this advisory, including CVE-2026-31503.

CVE-2026-31503

Fixed: 1 product Known affected: 2 products

https://learn.microsoft.com/en-us/azure/azure-linux/tutoria…

Open the full advisory

OPENSUSE-SU-2026:20826-1

Vulnerability from csaf_opensuse - Published: 2026-05-28 12:58 - Updated: 2026-05-28 12:58

Summary

Security update for the Linux Kernel

Severity

Important

Scope

206 vulnerabilities in this advisory, including CVE-2026-31503.

CVE-2026-31503

6.1 (Medium)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

Recommended: 136 products

Open the full advisory

RHSA-2026:64775

Vulnerability from csaf_redhat - Published: 2026-09-08 09:06 - Updated: 2026-09-16 15:29

Summary

Red Hat Security Advisory: kernel security, bug fix, and enhancement update

Severity

Important

Scope

22 vulnerabilities in this advisory, including CVE-2026-31503.

CVE-2026-31503

A flaw was found in the Linux kernel's User Datagram Protocol (UDP) implementation. When a significant number of UDP sockets are bound to specific local addresses on the same port, the kernel's conflict detection mechanism can fail. This allows a local attacker to bind to a wildcard address on a port that should already be in use, potentially leading to a Denial of Service (DoS) for legitimate applications attempting to use that port.

5.5 (Medium)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Fixed: 309 products

https://access.redhat.com/errata/RHSA-2026:64775

Open the full advisory

rlsa-2026:64775

Vulnerability from osv_rocky

Published

2026-09-09 12:09

Modified

2026-09-16 18:14

Summary

Important: kernel security, bug fix, and enhancement update

Details

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

kernel: can: bcm: add locking for bcm_op runtime updates (CVE-2025-38004)
kernel: ipv6: add NULL checks for idev in SRv6 paths (CVE-2026-23442)
kernel: udp: Fix wildcard bind conflict check when using hash2 (CVE-2026-31503)
kernel: ipv6: prevent possible UaF in addrconf_permanent_addr() (CVE-2026-43339)
kernel: tcp: call sk_data_ready() after listener migration (CVE-2026-46015)
kernel: inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP (CVE-2026-46266)
kernel: flow_dissector: do not dissect PPPoE PFC frames (CVE-2026-46306)
kernel: io_uring/poll: fix signed comparison in io_poll_get_ownership() (CVE-2026-52933)
kernel: ppp: require CAP_NET_ADMIN in target netns for unattached ioctls (CVE-2026-53075)
kernel: KVM: arm64: Take the SRCU lock for page table walks in fault injection and AT emulation (CVE-2026-53277)
kernel: ipv6: sit: reload inner IPv6 header after GSO offloads (CVE-2026-53228)
kernel: net: add pskb_may_pull() to skb_gro_receive_list() (CVE-2026-53235)
kernel: net: guard timestamp cmsgs to real error queue skbs (CVE-2026-53223)
kernel: ipv6: mcast: Fix use-after-free when processing MLD queries (CVE-2026-53275)
kernel: ipv6: anycast: insert aca into global hash under idev->lock (CVE-2026-53259)
kernel: ipv4: free net->ipv4.sysctl_local_reserved_ports after unregister_net_sysctl_table() (CVE-2026-64002)
kernel: vxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu() (CVE-2026-63993)
kernel: fuse: clear intr_entry in fuse_resend and fuse_remove_pending_req (CVE-2026-64265)
kernel: nvmet-auth: validate reply message payload bounds against transfer length (CVE-2026-64319)
kernel: KVM: arm64: Bound used_lrs when flushing the pKVM hyp vCPU (CVE-2026-64287)
kernel: rhashtable: clear stale iter->p on table restart (CVE-2026-64563)
kernel: smb: client: fix double-free in SMB2_close() replay (CVE-2026-64597)

Bug Fix(es) and Enhancement(s):

Customer needs "netfilter: nfnetlink_queue: optimize verdict lookup with hash table" patch [Rocky Linux 10.2] (JIRA:Rocky Linux-132852)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Severity

7.8 (High)


                    
                      CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Credits

Rocky Enterprise Software Foundation

Red Hat

References

URL

Type

	https://errata.rockylinux.org/RLSA-2026:64775	ADVISORY
	https://bugzilla.redhat.com/show_bug.cgi?id=2484456	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2370992	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2510892	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2507041	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2460736	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2511932	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2507096	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2492745	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2486463	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2454807	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2492295	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2502363	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2502369	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2492841	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2481936	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2492725	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2492733	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2492097	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2468102	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2492850	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2492811	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2507129	REPORT
	https://access.redhat.com/errata/RHSA-2026:64775	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Rocky Linux:10",
        "name": "kernel",
        "purl": "pkg:rpm/rocky-linux/kernel?distro=rocky-linux-10\u0026epoch=0"
      },
      "ranges": [
        {
          "database_specific": {
            "yum_repository": "BaseOS"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0:6.12.0-211.52.1.el10_2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "credits": [
    {
      "name": "Rocky Enterprise Software Foundation"
    },
    {
      "name": "Red Hat"
    }
  ],
  "database_specific": {
    "license": "CC-BY-4.0",
    "license_url": "https://creativecommons.org/licenses/by/4.0/",
    "source_advisory": "RHSA-2026:64775"
  },
  "details": "The kernel packages contain the Linux kernel, the core of any Linux operating system.\n\nSecurity Fix(es):\n\n* kernel: can: bcm: add locking for bcm_op runtime updates (CVE-2025-38004)\n\n* kernel: ipv6: add NULL checks for idev in SRv6 paths (CVE-2026-23442)\n\n* kernel: udp: Fix wildcard bind conflict check when using hash2 (CVE-2026-31503)\n\n* kernel: ipv6: prevent possible UaF in addrconf_permanent_addr() (CVE-2026-43339)\n\n* kernel: tcp: call sk_data_ready() after listener migration (CVE-2026-46015)\n\n* kernel: inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP (CVE-2026-46266)\n\n* kernel: flow_dissector: do not dissect PPPoE PFC frames (CVE-2026-46306)\n\n* kernel: io_uring/poll: fix signed comparison in io_poll_get_ownership() (CVE-2026-52933)\n\n* kernel: ppp: require CAP_NET_ADMIN in target netns for unattached ioctls (CVE-2026-53075)\n\n* kernel: KVM: arm64: Take the SRCU lock for page table walks in fault injection and AT emulation (CVE-2026-53277)\n\n* kernel: ipv6: sit: reload inner IPv6 header after GSO offloads (CVE-2026-53228)\n\n* kernel: net: add pskb_may_pull() to skb_gro_receive_list() (CVE-2026-53235)\n\n* kernel: net: guard timestamp cmsgs to real error queue skbs (CVE-2026-53223)\n\n* kernel: ipv6: mcast: Fix use-after-free when processing MLD queries (CVE-2026-53275)\n\n* kernel: ipv6: anycast: insert aca into global hash under idev-\u003elock (CVE-2026-53259)\n\n* kernel: ipv4: free net-\u003eipv4.sysctl_local_reserved_ports after unregister_net_sysctl_table() (CVE-2026-64002)\n\n* kernel: vxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu() (CVE-2026-63993)\n\n* kernel: fuse: clear intr_entry in fuse_resend and fuse_remove_pending_req (CVE-2026-64265)\n\n* kernel: nvmet-auth: validate reply message payload bounds against transfer length (CVE-2026-64319)\n\n* kernel: KVM: arm64: Bound used_lrs when flushing the pKVM hyp vCPU (CVE-2026-64287)\n\n* kernel: rhashtable: clear stale iter-\u003ep on table restart (CVE-2026-64563)\n\n* kernel: smb: client: fix double-free in SMB2_close() replay (CVE-2026-64597)\n\nBug Fix(es) and Enhancement(s):\n\n* Customer needs \"netfilter: nfnetlink_queue: optimize verdict lookup with hash table\" patch [Rocky Linux 10.2] (JIRA:Rocky Linux-132852)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
  "id": "RLSA-2026:64775",
  "modified": "2026-09-16T18:14:04.638535Z",
  "published": "2026-09-09T12:09:16.585859Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://errata.rockylinux.org/RLSA-2026:64775"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2484456"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2370992"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2510892"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507041"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460736"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2511932"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507096"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492745"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2486463"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2454807"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492295"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502363"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502369"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492841"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2481936"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492725"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492733"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492097"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2468102"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492850"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492811"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507129"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:64775"
    }
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Important: kernel security, bug fix, and enhancement update",
  "upstream": [
    "CVE-2025-38004",
    "CVE-2026-23442",
    "CVE-2026-31503",
    "CVE-2026-43339",
    "CVE-2026-46015",
    "CVE-2026-46266",
    "CVE-2026-46306",
    "CVE-2026-52933",
    "CVE-2026-53075",
    "CVE-2026-53223",
    "CVE-2026-53228",
    "CVE-2026-53235",
    "CVE-2026-53259",
    "CVE-2026-53275",
    "CVE-2026-53277",
    "CVE-2026-63993",
    "CVE-2026-64002",
    "CVE-2026-64265",
    "CVE-2026-64287",
    "CVE-2026-64319",
    "CVE-2026-64563",
    "CVE-2026-64597"
  ]
}

SSA-019113

Vulnerability from csaf_siemens - Published: 2026-07-14 00:00 - Updated: 2026-09-08 00:00

Summary

SSA-019113: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP V3.1.6

Scope

431 vulnerabilities in this advisory, including CVE-2026-31503.

CVE-2026-31503

5.5 (Medium)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Known affected: 5 products

Open the full advisory

SSA-082556

Vulnerability from csaf_siemens - Published: 2025-06-10 00:00 - Updated: 2026-07-14 00:00

Summary

SSA-082556: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP V3.1.5

Scope

316 vulnerabilities in this advisory, including CVE-2026-31503.

CVE-2026-31503

5.5 (Medium)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Known affected: 5 products

Open the full advisory

SUSE-SU-2026:21841-1

Vulnerability from csaf_suse - Published: 2026-05-28 11:40 - Updated: 2026-05-28 11:40

Summary

Security update for the Linux Kernel

Severity

Important

Scope

206 vulnerabilities in this advisory, including CVE-2026-31503.

CVE-2026-31503

6.1 (Medium)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

Recommended: 28 products

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-31503 (GCVE-0-2026-31503)

Vulnerability from osv_rocky

Tags

Sightings

Nomenclature

Related by attack behaviour