CVE-2026-98626 (GCVE-0-2026-98626)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:19 – Updated: 2026-10-19 09:22
VLAI
Title
bpf: Restrict CO-RE poisoning to relocatable instructions
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7018 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d7a252708dbc950ca2064310217e8b9f85846e2f , < a8c47e62d9aea2d47a09e06c1682c59c21b92449 (git)
Affected: d7a252708dbc950ca2064310217e8b9f85846e2f , < d3219c229d16900cef936adad28633c98946e432 (git)
Affected: d7a252708dbc950ca2064310217e8b9f85846e2f , < a0b79cdfcf34b53c85bac2d3cf022fc1342eeca0 (git)
Affected: d7a252708dbc950ca2064310217e8b9f85846e2f , < f2a24101e89dd0804e717da7c1bd6af513698aa2 (git)
Affected: d7a252708dbc950ca2064310217e8b9f85846e2f , < 2d7d04357c41aa49a5ac658fcc207439f2ad6456 (git)
Affected: d7a252708dbc950ca2064310217e8b9f85846e2f , < 8e4cbcca1e0a2fc5e6c8edb68e0cf5f2587f9319 (git)
Affected: d7a252708dbc950ca2064310217e8b9f85846e2f , < 394ae398337c5f87e567f6cd63b937fc2b2f6ddc (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.6
Unaffected: 0 , < 5.6 (semver)
Unaffected: 5.15.222 , ≤ 5.15.* (semver)
Unaffected: 6.1.189 , ≤ 6.1.* (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.112 , ≤ 6.12.* (semver)
Unaffected: 6.18.55 , ≤ 6.18.* (semver)
Unaffected: 7.2.9 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "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."
        }
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            "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."
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      "cve": "CVE-2026-98626",
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      "product_status:known_not_affected": "278",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf: Restrict CO-RE poisoning to relocatable instructions",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98626.json",
      "version": "3"
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  }
}



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