bpf: Reject dev-bound-only programs on other devices

{
  "id": "4d657a6c314a5fc628b3194a091a169ef3a495d66205ba930822a4dcbba22d38",
  "url": "https://osv.dev/vulnerability/CVE-2026-98382",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "bpf: Reject dev-bound-only programs on other devices",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: bpf: Reject dev-bound-only programs on other devices __bpf_offload_dev_match() falls back to comparing offdev pointers after an exact netdev mismatch. Bound-only programs normally have NULL offdevs, so unrelated netdevs compare equal. A bound-only program on an offload-registered netdev can instead inherit a real offdev and match a sibling port. With CAP_BPF and CAP_NET_ADMIN, a caller can use bpf(BPF_LINK_CREATE) with a different target ifindex to run metadata kfuncs specialized for the bound driver on the target driver's xdp_buff. Running a veth-bound program on tun reads beyond tun's bare stack xdp_buff as a veth_xdp_buff. Oops: general protection fault, probably for non-canonical address KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] RIP: 0010:veth_xdp_rx_timestamp (drivers/net/veth.c:1673) Call Trace: ... tun_build_skb (drivers/net/tun.c:1739) tun_get_user (drivers/net/tun.c:1856) tun_chr_write_iter (drivers/net/tun.c:2091) vfs_write (fs/read_write.c:595 fs/read_write.c:687) ksys_write (fs/read_write.c:739) do_syscall_64 (arch/x86/entry/syscall_64.c:84) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) Kernel panic - not syncing: Fatal exception in interrupt Restrict non-offloaded programs to exact netdev matches and retain the shared-offdev fallback only for genuinely offloaded multi-port programs.",
    "evidence": "osv:CVE-2026-98382",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.158",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.112",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.55",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.9",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-98382",
      "aliases": [
        "CVE-2026-98382"
      ],
      "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": "2b3486bc2d237ec345b3942b7be5deabf8c8fed1"
                },
                {
                  "fixed": "e57f04194361574493e3e6cf0b9e9c69e4ae9791"
                },
                {
                  "fixed": "0dceda331180617aeeb22381e8480b37f18ba08b"
                },
                {
                  "fixed": "940b626854de200e6187777d42114727daca617c"
                },
                {
                  "fixed": "bb375f3c5990e29851894f20ebc4b9dbc6676126"
                },
                {
                  "fixed": "6db1ce73e9853f533eb7f413f14ba00f8ec6f80d"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98382.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.3.0"
                },
                {
                  "fixed": "6.6.158"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.112"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.55"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.9"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98382.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:52.621469164Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0dceda331180617aeeb22381e8480b37f18ba08b",
        "https://git.kernel.org/stable/c/6db1ce73e9853f533eb7f413f14ba00f8ec6f80d",
        "https://git.kernel.org/stable/c/940b626854de200e6187777d42114727daca617c",
        "https://git.kernel.org/stable/c/bb375f3c5990e29851894f20ebc4b9dbc6676126",
        "https://git.kernel.org/stable/c/e57f04194361574493e3e6cf0b9e9c69e4ae9791",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98382.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98382",
        "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/2026/98xxx/CVE-2026-98382.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98382",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 521453,
  "published_at": "2026-10-09T07:34:21.718+00:00"
}