pktgen: Avoid out-of-bounds access in get_imix_entries

{
  "id": "6f794d54b6e143184446720643d798797ec6c7b8e40393ff56880380e87d9b03",
  "url": "https://osv.dev/vulnerability/CVE-2025-21680",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "pktgen: Avoid out-of-bounds access in get_imix_entries",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: pktgen: Avoid out-of-bounds access in get_imix_entries Passing a sufficient amount of imix entries leads to invalid access to the pkt_dev->imix_entries array because of the incorrect boundary check. UBSAN: array-index-out-of-bounds in net/core/pktgen.c:874:24 index 20 is out of range for type 'imix_pkt [20]' CPU: 2 PID: 1210 Comm: bash Not tainted 6.10.0-rc1 #121 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) Call Trace: dump_stack_lvl lib/dump_stack.c:117 __ubsan_handle_out_of_bounds lib/ubsan.c:429 get_imix_entries net/core/pktgen.c:874 pktgen_if_write net/core/pktgen.c:1063 pde_write fs/proc/inode.c:334 proc_reg_write fs/proc/inode.c:346 vfs_write fs/read_write.c:593 ksys_write fs/read_write.c:644 do_syscall_64 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe arch/x86/entry/entry_64.S:130 Found by Linux Verification Center (linuxtesting.org) with SVACE. [ fp: allow to fill the array completely; minor changelog cleanup ]",
    "evidence": "osv:CVE-2025-21680",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.15.177",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.127",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.74",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.11",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2025-21680",
      "aliases": [
        "CVE-2025-21680"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/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": "52a62f8603f97e720882c8f5aff2767ac6a11d5f"
                },
                {
                  "fixed": "3450092cc2d1c311c5ea92a2486daa2a33520ea5"
                },
                {
                  "fixed": "e5d24a7074dcd0c7e76b7e7e4efbbe7418d62486"
                },
                {
                  "fixed": "7cde21f52042aa2e29a654458166b873d2ae66b3"
                },
                {
                  "fixed": "1a9b65c672ca9dc4ba52ca2fd54329db9580ce29"
                },
                {
                  "fixed": "76201b5979768500bca362871db66d77cb4c225e"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21680.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.15.0"
                },
                {
                  "fixed": "5.15.177"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.127"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.74"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.11"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21680.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:51.201601728Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1a9b65c672ca9dc4ba52ca2fd54329db9580ce29",
        "https://git.kernel.org/stable/c/3450092cc2d1c311c5ea92a2486daa2a33520ea5",
        "https://git.kernel.org/stable/c/76201b5979768500bca362871db66d77cb4c225e",
        "https://git.kernel.org/stable/c/7cde21f52042aa2e29a654458166b873d2ae66b3",
        "https://git.kernel.org/stable/c/e5d24a7074dcd0c7e76b7e7e4efbbe7418d62486",
        "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21680.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-21680",
        "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/2025/21xxx/CVE-2025-21680.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-21680",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 519602,
  "published_at": "2025-01-31T11:25:40.831+00:00"
}