bpf: Restrict CO-RE poisoning to relocatable instructions

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98626
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-18 16:17:15 UTC
Updated2026-10-19 10:19:26 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d7a252708dbc950ca2064310217e8b9f85846e2f a8c47e62d9aea2d47a09e06c1682c59c21b92449 git Not specified
CNA Linux Linux affected d7a252708dbc950ca2064310217e8b9f85846e2f d3219c229d16900cef936adad28633c98946e432 git Not specified
CNA Linux Linux affected d7a252708dbc950ca2064310217e8b9f85846e2f a0b79cdfcf34b53c85bac2d3cf022fc1342eeca0 git Not specified
CNA Linux Linux affected d7a252708dbc950ca2064310217e8b9f85846e2f f2a24101e89dd0804e717da7c1bd6af513698aa2 git Not specified
CNA Linux Linux affected d7a252708dbc950ca2064310217e8b9f85846e2f 2d7d04357c41aa49a5ac658fcc207439f2ad6456 git Not specified
CNA Linux Linux affected d7a252708dbc950ca2064310217e8b9f85846e2f 8e4cbcca1e0a2fc5e6c8edb68e0cf5f2587f9319 git Not specified
CNA Linux Linux affected d7a252708dbc950ca2064310217e8b9f85846e2f 394ae398337c5f87e567f6cd63b937fc2b2f6ddc git Not specified
CNA Linux Linux affected 5.6 Not specified
CNA Linux Linux unaffected 5.6 semver Not specified
CNA Linux Linux unaffected 5.15.222 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.189 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.158 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.112 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.55 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.9 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/d3219c229d16900cef936adad28633c98946e432 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/394ae398337c5f87e567f6cd63b937fc2b2f6ddc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f2a24101e89dd0804e717da7c1bd6af513698aa2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a8c47e62d9aea2d47a09e06c1682c59c21b92449 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a0b79cdfcf34b53c85bac2d3cf022fc1342eeca0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2d7d04357c41aa49a5ac658fcc207439f2ad6456 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8e4cbcca1e0a2fc5e6c8edb68e0cf5f2587f9319 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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