{"api_version":"1","generated_at":"2026-09-26T08:49:05+00:00","cve":"CVE-2026-98085","urls":{"html":"https://cve.report/CVE-2026-98085","api":"https://cve.report/api/cve/CVE-2026-98085.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-98085","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-98085"},"summary":{"title":"bpf: backtrack_insn(): Handle ld_{abs,ind} subprog exit edge","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: backtrack_insn(): Handle ld_{abs,ind} subprog exit edge\n\nNicholas Carlini reported a bug in precision backtracking mechanism\nfor BPF_LD | BPF_{IND,ABS} instructions. These instructions are\nmodelled as two branches:\n- fallthrough;\n- implicit exit from current subprogram.\n\nThe implicit exit case was not handled by the backtrack_insn()\nfunction. When backtracking such a path backtrack_insn() did not\ncall bt_subprog_enter(), which meant that backtracking continued\nmanipulating precision marks in a caller frame, while looking at\ninstructions in a callee frame.\n\nThis lead to segmentation faults during verification (see the\nselftest), or unsound state pruning.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-25 11:17:38","updated_at":"2026-09-25 11:17:38"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/387b1baefbb776e3f48dc2261e77a49213f470f7","name":"https://git.kernel.org/stable/c/387b1baefbb776e3f48dc2261e77a49213f470f7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/671b7b9a660ef15b25faa3df161205b9dc8d1eb2","name":"https://git.kernel.org/stable/c/671b7b9a660ef15b25faa3df161205b9dc8d1eb2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98085","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98085","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ce01a4e5cfac7adbe0be565f90cd32ecbb2f8337 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d846d83bdacbd8f14fc45c63b8c1d22608452e1c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.10.265 5.11 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.15.216 5.16 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.1.183 6.2 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.6.148 6.7 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.12.101 6.13 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.18.42 6.19 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7.0.10 7.1 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7.1","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.7 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc2 * 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":["kernel/bpf/backtrack.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"671b7b9a660ef15b25faa3df161205b9dc8d1eb2","status":"affected","version":"ee861486e377edc55361c08dcbceab3f6b6577bd","versionType":"git"},{"lessThan":"387b1baefbb776e3f48dc2261e77a49213f470f7","status":"affected","version":"ee861486e377edc55361c08dcbceab3f6b6577bd","versionType":"git"},{"status":"affected","version":"928d354ae3557e8f755a227e67be88034eb3cd7f","versionType":"git"},{"status":"affected","version":"8a800497d9f6c2ec9c2c1ba7b71d0ac2ea7f7bbe","versionType":"git"},{"status":"affected","version":"de1055e7f9e67af32b1f3376066272b04e5223c0","versionType":"git"},{"status":"affected","version":"37ad2bb11e9de92cb7b94548705eeedd87f7d392","versionType":"git"},{"status":"affected","version":"8674e2db06cff6b50f2216eed9a761d15425bb34","versionType":"git"},{"status":"affected","version":"ce01a4e5cfac7adbe0be565f90cd32ecbb2f8337","versionType":"git"},{"status":"affected","version":"d846d83bdacbd8f14fc45c63b8c1d22608452e1c","versionType":"git"},{"lessThan":"5.11","status":"affected","version":"5.10.265","versionType":"semver"},{"lessThan":"5.16","status":"affected","version":"5.15.216","versionType":"semver"},{"lessThan":"6.2","status":"affected","version":"6.1.183","versionType":"semver"},{"lessThan":"6.7","status":"affected","version":"6.6.148","versionType":"semver"},{"lessThan":"6.13","status":"affected","version":"6.12.101","versionType":"semver"},{"lessThan":"6.19","status":"affected","version":"6.18.42","versionType":"semver"},{"lessThan":"7.1","status":"affected","version":"7.0.10","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["kernel/bpf/backtrack.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"7.1"},{"lessThan":"7.1","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.7","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.7","versionStartIncluding":"7.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc2","versionStartIncluding":"7.1","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.265","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.216","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.183","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.148","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.101","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18.42","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.0.10","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: backtrack_insn(): Handle ld_{abs,ind} subprog exit edge\n\nNicholas Carlini reported a bug in precision backtracking mechanism\nfor BPF_LD | BPF_{IND,ABS} instructions. These instructions are\nmodelled as two branches:\n- fallthrough;\n- implicit exit from current subprogram.\n\nThe implicit exit case was not handled by the backtrack_insn()\nfunction. When backtracking such a path backtrack_insn() did not\ncall bt_subprog_enter(), which meant that backtracking continued\nmanipulating precision marks in a caller frame, while looking at\ninstructions in a callee frame.\n\nThis lead to segmentation faults during verification (see the\nselftest), or unsound state pruning."}],"providerMetadata":{"dateUpdated":"2026-09-25T10:24:20.485Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/671b7b9a660ef15b25faa3df161205b9dc8d1eb2"},{"url":"https://git.kernel.org/stable/c/387b1baefbb776e3f48dc2261e77a49213f470f7"}],"title":"bpf: backtrack_insn(): Handle ld_{abs,ind} subprog exit edge","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-98085","datePublished":"2026-09-25T10:24:20.485Z","dateReserved":"2026-09-25T10:19:56.075Z","dateUpdated":"2026-09-25T10:24:20.485Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-25 11:17:38","lastModifiedDate":"2026-09-25 11:17:38","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"98085","Ordinal":"1","Title":"bpf: backtrack_insn(): Handle ld_{abs,ind} subprog exit edge","CVE":"CVE-2026-98085","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"98085","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: backtrack_insn(): Handle ld_{abs,ind} subprog exit edge\n\nNicholas Carlini reported a bug in precision backtracking mechanism\nfor BPF_LD | BPF_{IND,ABS} instructions. These instructions are\nmodelled as two branches:\n- fallthrough;\n- implicit exit from current subprogram.\n\nThe implicit exit case was not handled by the backtrack_insn()\nfunction. When backtracking such a path backtrack_insn() did not\ncall bt_subprog_enter(), which meant that backtracking continued\nmanipulating precision marks in a caller frame, while looking at\ninstructions in a callee frame.\n\nThis lead to segmentation faults during verification (see the\nselftest), or unsound state pruning.","Type":"Description","Title":"bpf: backtrack_insn(): Handle ld_{abs,ind} subprog exit edge"}]}}}