CVE-2026-98626 (GCVE-0-2026-98626)
Vulnerability from cvelistv5
Published
2026-10-18 15:19
Modified
2026-10-19 09:22
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Restrict CO-RE poisoning to relocatable instructions CO-RE relocation records can name any instruction offset. When a relocation cannot be resolved, bpf_core_patch_insn() currently poisons its target before checking whether that instruction is a valid relocation target. Malformed metadata can therefore replace jumps, calls, exits, register-source arithmetic, or non-immediate loads instead of failing at the relocation step. Handle poisoning only after the instruction has passed the same class and operand-form checks used for a resolved relocation. Route invalid forms through the existing diagnostic and return a hard error. Keep poisoning supported instructions, including both halves of a plain ldimm64, so an unresolved relocation in dead code remains valid. Extend bpf_core_poison_insn() to poison both halves of ldimm64, and return its status directly from each validated instruction case. This avoids routing the success path through a common label and leaves the helper free to report errors. The shared relocation code applies this restriction to both libbpf and in-kernel CO-RE.
References
Impacted products
Vendor Product Version
Linux Linux Version: d7a252708dbc950ca2064310217e8b9f85846e2f
Version: d7a252708dbc950ca2064310217e8b9f85846e2f
Version: d7a252708dbc950ca2064310217e8b9f85846e2f
Version: d7a252708dbc950ca2064310217e8b9f85846e2f
Version: d7a252708dbc950ca2064310217e8b9f85846e2f
Version: d7a252708dbc950ca2064310217e8b9f85846e2f
Version: d7a252708dbc950ca2064310217e8b9f85846e2f
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{
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              "version": "7.3",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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          "nodes": [
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              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:22:54.307Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a8c47e62d9aea2d47a09e06c1682c59c21b92449"
        },
        {
          "url": "https://git.kernel.org/stable/c/d3219c229d16900cef936adad28633c98946e432"
        },
        {
          "url": "https://git.kernel.org/stable/c/a0b79cdfcf34b53c85bac2d3cf022fc1342eeca0"
        },
        {
          "url": "https://git.kernel.org/stable/c/f2a24101e89dd0804e717da7c1bd6af513698aa2"
        },
        {
          "url": "https://git.kernel.org/stable/c/2d7d04357c41aa49a5ac658fcc207439f2ad6456"
        },
        {
          "url": "https://git.kernel.org/stable/c/8e4cbcca1e0a2fc5e6c8edb68e0cf5f2587f9319"
        },
        {
          "url": "https://git.kernel.org/stable/c/394ae398337c5f87e567f6cd63b937fc2b2f6ddc"
        }
      ],
      "title": "bpf: Restrict CO-RE poisoning to relocatable instructions",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98626",
    "datePublished": "2026-10-18T15:19:47.832Z",
    "dateReserved": "2026-09-25T10:25:14.361Z",
    "dateUpdated": "2026-10-19T09:22:54.307Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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