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CVE-2026-98626

bpf: Restrict CO-RE poisoning to relocatable instructions

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.15.222, 6.1.189, 6.6.158, 6.12.112, 6.18.55, and 1 more
None on Exploit-DB, Metasploit or GitHub

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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From d7a252708dbc950ca2064310217e8b9f85846e2f · fixed in a8c47e62d9aea2d47a09e06c1682c59c21b92449; From d7a252708dbc950ca2064310217e8b9f85846e2f · fixed in d3219c229d16900cef936adad28633c98946e432; From d7a252708dbc950ca2064310217e8b9f85846e2f · fixed in a0b79cdfcf34b53c85bac2d3cf022fc1342eeca0; From d7a252708dbc950ca2064310217e8b9f85846e2f · fixed in f2a24101e89dd0804e717da7c1bd6af513698aa2; From d7a252708dbc950ca2064310217e8b9f85846e2f · fixed in 2d7d04357c41aa49a5ac658fcc207439f2ad6456; From d7a252708dbc950ca2064310217e8b9f85846e2f · fixed in 8e4cbcca1e0a2fc5e6c8edb68e0cf5f2587f9319; From d7a252708dbc950ca2064310217e8b9f85846e2f · fixed in 394ae398337c5f87e567f6cd63b937fc2b2f6ddc

  • Linux Linux

    5.6

  • KernelLinux

    From 5.6.0 · fixed in 5.15.222; From 5.16.0 · fixed in 6.1.189; From 6.2.0 · fixed in 6.6.158; From 6.7.0 · fixed in 6.12.112; From 6.13.0 · fixed in 6.18.55; From 6.19.0 · fixed in 7.2.9

References 7

git.kernel.org