vxlan: Fix nexthop hash size

{
  "id": "8d64c3e1ab76fbfd485a8334f5673e7ffe327df9acad751bfc84efdbbef81632",
  "url": "https://osv.dev/vulnerability/CVE-2023-53192",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "vxlan: Fix nexthop hash size",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: vxlan: Fix nexthop hash size The nexthop code expects a 31 bit hash, such as what is returned by fib_multipath_hash() and rt6_multipath_hash(). Passing the 32 bit hash returned by skb_get_hash() can lead to problems related to the fact that 'int hash' is a negative number when the MSB is set. In the case of hash threshold nexthop groups, nexthop_select_path_hthr() will disproportionately select the first nexthop group entry. In the case of resilient nexthop groups, nexthop_select_path_res() may do an out of bounds access in nh_buckets[], for example: hash = -912054133 num_nh_buckets = 2 bucket_index = 65535 which leads to the following panic: BUG: unable to handle page fault for address: ffffc900025910c8 PGD 100000067 P4D 100000067 PUD 10026b067 PMD 0 Oops: 0002 [#1] PREEMPT SMP KASAN NOPTI CPU: 4 PID: 856 Comm: kworker/4:3 Not tainted 6.5.0-rc2+ #34 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Workqueue: ipv6_addrconf addrconf_dad_work RIP: 0010:nexthop_select_path+0x197/0xbf0 Code: c1 e4 05 be 08 00 00 00 4c 8b 35 a4 14 7e 01 4e 8d 6c 25 00 4a 8d 7c 25 08 48 01 dd e8 c2 25 15 ff 49 8d 7d 08 e8 39 13 15 ff <4d> 89 75 08 48 89 ef e8 7d 12 15 ff 48 8b 5d 00 e8 14 55 2f 00 85 RSP: 0018:ffff88810c36f260 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 00000000002000c0 RCX: ffffffffaf02dd77 RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffffc900025910c8 RBP: ffffc9000",
    "evidence": "osv:CVE-2023-53192",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.190",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.126",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.45",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.4.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "critical",
    "structured": {
      "id": "CVE-2023-53192",
      "aliases": [
        "CVE-2023-53192"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "1274e1cc42264d4e629841e4f182795cb0becfd2"
                },
                {
                  "fixed": "c650597647ecb318d02372277bdfd866c6829f78"
                },
                {
                  "fixed": "32ef2c0c6cf11a076f0280a7866b9abc47821e19"
                },
                {
                  "fixed": "7b8717658dff8b471cbfc124bf9b5ca4229579ed"
                },
                {
                  "fixed": "23c195ce6f4aec86e1c9e1ea1c800381c4b465c7"
                },
                {
                  "fixed": "0756384fb1bd38adb2ebcfd1307422f433a1d772"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53192.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.8.0"
                },
                {
                  "fixed": "5.10.190"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.126"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.45"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.4.10"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-53192.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:24.332100513Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0756384fb1bd38adb2ebcfd1307422f433a1d772",
        "https://git.kernel.org/stable/c/23c195ce6f4aec86e1c9e1ea1c800381c4b465c7",
        "https://git.kernel.org/stable/c/32ef2c0c6cf11a076f0280a7866b9abc47821e19",
        "https://git.kernel.org/stable/c/7b8717658dff8b471cbfc124bf9b5ca4229579ed",
        "https://git.kernel.org/stable/c/c650597647ecb318d02372277bdfd866c6829f78",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53192.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-53192",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53192.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-53192",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 490798,
  "published_at": "2025-09-15T14:06:37.241+00:00"
}