bpf: Fix overflow of jump offset in constant blinding

{
  "id": "a05b02bcdd13cc2895be8d33d1bd98e8c6789ed0675b9edb8386b1bbedcbb9fd",
  "url": "https://osv.dev/vulnerability/CVE-2026-98816",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "bpf: Fix overflow of jump offset in constant blinding",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: bpf: Fix overflow of jump offset in constant blinding bpf_jit_blind_insn() rewrites 'if rX op imm goto off' into: AX = imm ^ rnd AX ^= rnd if rX op AX goto off and subtracts 2 from off when the jump is backward. off is s16, so -32767 and -32768 wrap and the jump goes 32767 insns forward, past the end of the prog. The jump is inside the patch, hence bpf_adj_branches() doesn't check it. The kernel crashes when such prog runs with bpf_jit_harden=2. Return -ERANGE in such case. bpf_jit_blind_constants() fails the same way when blinding of other insns moves a jump out of range.",
    "evidence": "osv:CVE-2026-98816",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "7.2.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-98816",
      "aliases": [
        "CVE-2026-98816"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "4f3446bb809f20ad56cadf712e6006815ae7a8f9"
                },
                {
                  "fixed": "443328237113ee0ea515e506497334d871dbc2aa"
                },
                {
                  "fixed": "ad139384ecddb6f3e7e3c3c12765aafae0e39670"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98816.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.7.0"
                },
                {
                  "fixed": "7.2.10"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98816.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:35.575372559Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/443328237113ee0ea515e506497334d871dbc2aa",
        "https://git.kernel.org/stable/c/ad139384ecddb6f3e7e3c3c12765aafae0e39670",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98816.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98816",
        "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-2026-98816.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98816",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 503008,
  "published_at": "2026-10-18T15:49:05.616+00:00"
}