Answer in brief
CVE-2026-98626 records a Unknown severity vulnerability in bpf: Restrict CO-RE poisoning to relocatable instructions. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=d7a252708dbc950ca2064310217e8b9f85846e2f <a8c47e62d9aea2d47a09e06c1682c59c21b92449 || >=d7a252708dbc950ca2064310217e8b9f85846e2f <d3219c229d16900cef936adad28633c98946e432 || >=d7a252708dbc950ca2064310217e8b9f85846e2f <a0b79cdfcf34b53c85bac2d3cf022fc1342eeca0 || >=d7a252708dbc950ca2064310217e8b9f85846e2f <f2a24101e89dd0804e717da7c1bd6af513698aa2 || >=d7a252708dbc950ca2064310217e8b9f85846e2f <2d7d04357c41aa49a5ac658fcc207439f2ad6456 || >=d7a252708dbc950ca2064310217e8b9f85846e2f <8e4cbcca1e0a2fc5e6c8edb68e0cf5f2587f9319 || >=d7a252708dbc950ca2064310217e8b9f85846e2f <394ae398337c5f87e567f6cd63b937fc2b2f6ddc | a8c47e62d9aea2d47a09e06c1682c59c21b92449, d3219c229d16900cef936adad28633c98946e432, a0b79cdfcf34b53c85bac2d3cf022fc1342eeca0, f2a24101e89dd0804e717da7c1bd6af513698aa2, 2d7d04357c41aa49a5ac658fcc207439f2ad6456, 8e4cbcca1e0a2fc5e6c8edb68e0cf5f2587f9319, 394ae398337c5f87e567f6cd63b937fc2b2f6ddc |
| Linux/Linuxgeneric | 5.6 | Not reported |
Published upstream
Oct 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 18, 2026
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.
Quoted source text, attributed separately from HOL analysis.