{"id":"CVE-2026-98626","revision":"0b31a7f963444bc3906ddcb599396f6e","records":[{"revision":"0b31a7f963444bc3906ddcb599396f6e","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98626","aliases":[],"title":"bpf: Restrict CO-RE poisoning to relocatable instructions","description":"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.","state":0,"publishedAt":"2026-10-18T15:19:47.832+00:00","modifiedAt":"2026-10-19T09:22:54.307+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"tools/lib/bpf/relo_core.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"d7a252708dbc950ca2064310217e8b9f85846e2f\",\n                            \"lessThan\": \"a8c47e62d9aea2d47a09e06c1682c59c21b92449\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d7a252708dbc950ca2064310217e8b9f85846e2f\",\n                            \"lessThan\": \"d3219c229d16900cef936adad28633c98946e432\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d7a252708dbc950ca2064310217e8b9f85846e2f\",\n                            \"lessThan\": \"a0b79cdfcf34b53c85bac2d3cf022fc1342eeca0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d7a252708dbc950ca2064310217e8b9f85846e2f\",\n                            \"lessThan\": \"f2a24101e89dd0804e717da7c1bd6af513698aa2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d7a252708dbc950ca2064310217e8b9f85846e2f\",\n                            \"lessThan\": \"2d7d04357c41aa49a5ac658fcc207439f2ad6456\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d7a252708dbc950ca2064310217e8b9f85846e2f\",\n                            \"lessThan\": \"8e4cbcca1e0a2fc5e6c8edb68e0cf5f2587f9319\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d7a252708dbc950ca2064310217e8b9f85846e2f\",\n                            \"lessThan\": \"394ae398337c5f87e567f6cd63b937fc2b2f6ddc\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"tools/lib/bpf/relo_core.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.6\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.6\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.222\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.189\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.158\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.112\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.55\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.9\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/a8c47e62d9aea2d47a09e06c1682c59c21b92449","https://git.kernel.org/stable/c/d3219c229d16900cef936adad28633c98946e432","https://git.kernel.org/stable/c/a0b79cdfcf34b53c85bac2d3cf022fc1342eeca0","https://git.kernel.org/stable/c/f2a24101e89dd0804e717da7c1bd6af513698aa2","https://git.kernel.org/stable/c/2d7d04357c41aa49a5ac658fcc207439f2ad6456","https://git.kernel.org/stable/c/8e4cbcca1e0a2fc5e6c8edb68e0cf5f2587f9319","https://git.kernel.org/stable/c/394ae398337c5f87e567f6cd63b937fc2b2f6ddc"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98626","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98626","identifiers":["CVE-2026-98626"]},"retained":false,"historicalAffected":[]}],"coverage":[]}