{"api_version":"1","generated_at":"2026-10-22T10:35:42+00:00","cve":"CVE-2026-98626","urls":{"html":"https://cve.report/CVE-2026-98626","api":"https://cve.report/api/cve/CVE-2026-98626.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-98626","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-98626"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-10-18 16:17:15","updated_at":"2026-10-19 10:19:26"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/d3219c229d16900cef936adad28633c98946e432","name":"https://git.kernel.org/stable/c/d3219c229d16900cef936adad28633c98946e432","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/394ae398337c5f87e567f6cd63b937fc2b2f6ddc","name":"https://git.kernel.org/stable/c/394ae398337c5f87e567f6cd63b937fc2b2f6ddc","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f2a24101e89dd0804e717da7c1bd6af513698aa2","name":"https://git.kernel.org/stable/c/f2a24101e89dd0804e717da7c1bd6af513698aa2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a8c47e62d9aea2d47a09e06c1682c59c21b92449","name":"https://git.kernel.org/stable/c/a8c47e62d9aea2d47a09e06c1682c59c21b92449","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a0b79cdfcf34b53c85bac2d3cf022fc1342eeca0","name":"https://git.kernel.org/stable/c/a0b79cdfcf34b53c85bac2d3cf022fc1342eeca0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2d7d04357c41aa49a5ac658fcc207439f2ad6456","name":"https://git.kernel.org/stable/c/2d7d04357c41aa49a5ac658fcc207439f2ad6456","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8e4cbcca1e0a2fc5e6c8edb68e0cf5f2587f9319","name":"https://git.kernel.org/stable/c/8e4cbcca1e0a2fc5e6c8edb68e0cf5f2587f9319","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98626","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98626","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d7a252708dbc950ca2064310217e8b9f85846e2f a8c47e62d9aea2d47a09e06c1682c59c21b92449 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d7a252708dbc950ca2064310217e8b9f85846e2f d3219c229d16900cef936adad28633c98946e432 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d7a252708dbc950ca2064310217e8b9f85846e2f a0b79cdfcf34b53c85bac2d3cf022fc1342eeca0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d7a252708dbc950ca2064310217e8b9f85846e2f f2a24101e89dd0804e717da7c1bd6af513698aa2 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.112 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.55 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.9 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["tools/lib/bpf/relo_core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"a8c47e62d9aea2d47a09e06c1682c59c21b92449","status":"affected","version":"d7a252708dbc950ca2064310217e8b9f85846e2f","versionType":"git"},{"lessThan":"d3219c229d16900cef936adad28633c98946e432","status":"affected","version":"d7a252708dbc950ca2064310217e8b9f85846e2f","versionType":"git"},{"lessThan":"a0b79cdfcf34b53c85bac2d3cf022fc1342eeca0","status":"affected","version":"d7a252708dbc950ca2064310217e8b9f85846e2f","versionType":"git"},{"lessThan":"f2a24101e89dd0804e717da7c1bd6af513698aa2","status":"affected","version":"d7a252708dbc950ca2064310217e8b9f85846e2f","versionType":"git"},{"lessThan":"2d7d04357c41aa49a5ac658fcc207439f2ad6456","status":"affected","version":"d7a252708dbc950ca2064310217e8b9f85846e2f","versionType":"git"},{"lessThan":"8e4cbcca1e0a2fc5e6c8edb68e0cf5f2587f9319","status":"affected","version":"d7a252708dbc950ca2064310217e8b9f85846e2f","versionType":"git"},{"lessThan":"394ae398337c5f87e567f6cd63b937fc2b2f6ddc","status":"affected","version":"d7a252708dbc950ca2064310217e8b9f85846e2f","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["tools/lib/bpf/relo_core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.6"},{"lessThan":"5.6","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.222","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.189","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.158","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.112","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.55","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.9","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.222","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.189","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.158","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.112","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.55","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.9","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3","versionStartIncluding":"5.6","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","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."}],"providerMetadata":{"dateUpdated":"2026-10-19T09:22:54.307Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/a8c47e62d9aea2d47a09e06c1682c59c21b92449"},{"url":"https://git.kernel.org/stable/c/d3219c229d16900cef936adad28633c98946e432"},{"url":"https://git.kernel.org/stable/c/a0b79cdfcf34b53c85bac2d3cf022fc1342eeca0"},{"url":"https://git.kernel.org/stable/c/f2a24101e89dd0804e717da7c1bd6af513698aa2"},{"url":"https://git.kernel.org/stable/c/2d7d04357c41aa49a5ac658fcc207439f2ad6456"},{"url":"https://git.kernel.org/stable/c/8e4cbcca1e0a2fc5e6c8edb68e0cf5f2587f9319"},{"url":"https://git.kernel.org/stable/c/394ae398337c5f87e567f6cd63b937fc2b2f6ddc"}],"title":"bpf: Restrict CO-RE poisoning to relocatable instructions","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-98626","datePublished":"2026-10-18T15:19:47.832Z","dateReserved":"2026-09-25T10:25:14.361Z","dateUpdated":"2026-10-19T09:22:54.307Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-18 16:17:15","lastModifiedDate":"2026-10-19 10:19:26","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"98626","Ordinal":"1","Title":"bpf: Restrict CO-RE poisoning to relocatable instructions","CVE":"CVE-2026-98626","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"98626","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"bpf: Restrict CO-RE poisoning to relocatable instructions"}]}}}