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bpf: Restrict CO-RE poisoning to relocatable instructions

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-98626

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-98626

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "d7a252708dbc950ca2064310217e8b9f85846e2f",
        "lessThan": "a8c47e62d9aea2d47a09e06c1682c59c21b92449",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d7a252708dbc950ca2064310217e8b9f85846e2f",
        "lessThan": "d3219c229d16900cef936adad28633c98946e432",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d7a252708dbc950ca2064310217e8b9f85846e2f",
        "lessThan": "a0b79cdfcf34b53c85bac2d3cf022fc1342eeca0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d7a252708dbc950ca2064310217e8b9f85846e2f",
        "lessThan": "f2a24101e89dd0804e717da7c1bd6af513698aa2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d7a252708dbc950ca2064310217e8b9f85846e2f",
        "lessThan": "2d7d04357c41aa49a5ac658fcc207439f2ad6456",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d7a252708dbc950ca2064310217e8b9f85846e2f",
        "lessThan": "8e4cbcca1e0a2fc5e6c8edb68e0cf5f2587f9319",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d7a252708dbc950ca2064310217e8b9f85846e2f",
        "lessThan": "394ae398337c5f87e567f6cd63b937fc2b2f6ddc",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "tools/lib/bpf/relo_core.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.6"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.6",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.222",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.189",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.112",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.55",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.9",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "tools/lib/bpf/relo_core.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98626

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#38647 · Revision 1
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Publisher date
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