{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "d7a252708dbc950ca2064310217e8b9f85846e2f"
            },
            {
              "fixed": "a8c47e62d9aea2d47a09e06c1682c59c21b92449"
            },
            {
              "fixed": "d3219c229d16900cef936adad28633c98946e432"
            },
            {
              "fixed": "a0b79cdfcf34b53c85bac2d3cf022fc1342eeca0"
            },
            {
              "fixed": "f2a24101e89dd0804e717da7c1bd6af513698aa2"
            },
            {
              "fixed": "2d7d04357c41aa49a5ac658fcc207439f2ad6456"
            },
            {
              "fixed": "8e4cbcca1e0a2fc5e6c8edb68e0cf5f2587f9319"
            },
            {
              "fixed": "394ae398337c5f87e567f6cd63b937fc2b2f6ddc"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.6.0"
            },
            {
              "fixed": "5.15.222"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.189"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "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"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98626.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Restrict CO-RE poisoning to relocatable instructions\n\nCO-RE relocation records can name any instruction offset. When a\nrelocation cannot be resolved, bpf_core_patch_insn() currently poisons its\ntarget before checking whether that instruction is a valid relocation\ntarget. Malformed metadata can therefore replace jumps, calls, exits,\nregister-source arithmetic, or non-immediate loads instead of failing at\nthe relocation step.\n\nHandle poisoning only after the instruction has passed the same class and\noperand-form checks used for a resolved relocation. Route invalid forms\nthrough the existing diagnostic and return a hard error. Keep poisoning\nsupported instructions, including both halves of a plain ldimm64, so an\nunresolved relocation in dead code remains valid.\n\nExtend bpf_core_poison_insn() to poison both halves of ldimm64, and return\nits status directly from each validated instruction case. This avoids\nrouting the success path through a common label and leaves the helper free\nto report errors.\n\nThe shared relocation code applies this restriction to both libbpf and\nin-kernel CO-RE.",
  "id": "CVE-2026-98626",
  "modified": "2026-10-20T02:30:27.109413849Z",
  "published": "2026-10-18T15:19:47.832Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2d7d04357c41aa49a5ac658fcc207439f2ad6456"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/394ae398337c5f87e567f6cd63b937fc2b2f6ddc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8e4cbcca1e0a2fc5e6c8edb68e0cf5f2587f9319"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a0b79cdfcf34b53c85bac2d3cf022fc1342eeca0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a8c47e62d9aea2d47a09e06c1682c59c21b92449"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d3219c229d16900cef936adad28633c98946e432"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f2a24101e89dd0804e717da7c1bd6af513698aa2"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98626.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98626"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "bpf: Restrict CO-RE poisoning to relocatable instructions"
}