{"api_version":"1","generated_at":"2026-09-25T22:18:41+00:00","cve":"CVE-2026-98042","urls":{"html":"https://cve.report/CVE-2026-98042","api":"https://cve.report/api/cve/CVE-2026-98042.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-98042","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-98042"},"summary":{"title":"bpf: Don't resurrect a scalar id dropped by collect_linked_regs()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Don't resurrect a scalar id dropped by collect_linked_regs()\n\ncheck_cond_jmp_op() copies the compared registers into\nenv->{false,true}_reg{1,2} before collect_linked_regs() runs and copies\nthose snapshots back into both branch states afterwards.\n\ncollect_linked_regs() records at most LINKED_REGS_MAX members of a\nlinked registers group in the jump history and calls clear_scalar_id()\nfor every member that does not fit. The compared register is not exempt\nfrom that.\n\nAs a consequence, sync_linked_regs() might adjust ranges for more\nregisters than bpf_bt_sync_linked_regs() can propagate precision to.\n\nCollect the linked registers before the snapshots are taken instead.\nThis might lead to some unnecessary clear_scalar_id's, but from\nprevious testing situations with many linked registers are\nextremely rare.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-25 11:17:32","updated_at":"2026-09-25 11:17:32"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/e821ff19b8ef08255ff8d8234774ed814637e9bf","name":"https://git.kernel.org/stable/c/e821ff19b8ef08255ff8d8234774ed814637e9bf","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/73a98f96811e2cb0f4210b1caa8cb322f92f2a2b","name":"https://git.kernel.org/stable/c/73a98f96811e2cb0f4210b1caa8cb322f92f2a2b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98042","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98042","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ec1d77cb0ee98249142dcd0376d76e7a48ba0b31 e821ff19b8ef08255ff8d8234774ed814637e9bf git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ec1d77cb0ee98249142dcd0376d76e7a48ba0b31 73a98f96811e2cb0f4210b1caa8cb322f92f2a2b git","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/verifier.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"e821ff19b8ef08255ff8d8234774ed814637e9bf","status":"affected","version":"ec1d77cb0ee98249142dcd0376d76e7a48ba0b31","versionType":"git"},{"lessThan":"73a98f96811e2cb0f4210b1caa8cb322f92f2a2b","status":"affected","version":"ec1d77cb0ee98249142dcd0376d76e7a48ba0b31","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["kernel/bpf/verifier.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}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Don't resurrect a scalar id dropped by collect_linked_regs()\n\ncheck_cond_jmp_op() copies the compared registers into\nenv->{false,true}_reg{1,2} before collect_linked_regs() runs and copies\nthose snapshots back into both branch states afterwards.\n\ncollect_linked_regs() records at most LINKED_REGS_MAX members of a\nlinked registers group in the jump history and calls clear_scalar_id()\nfor every member that does not fit. The compared register is not exempt\nfrom that.\n\nAs a consequence, sync_linked_regs() might adjust ranges for more\nregisters than bpf_bt_sync_linked_regs() can propagate precision to.\n\nCollect the linked registers before the snapshots are taken instead.\nThis might lead to some unnecessary clear_scalar_id's, but from\nprevious testing situations with many linked registers are\nextremely rare."}],"providerMetadata":{"dateUpdated":"2026-09-25T10:23:54.242Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/e821ff19b8ef08255ff8d8234774ed814637e9bf"},{"url":"https://git.kernel.org/stable/c/73a98f96811e2cb0f4210b1caa8cb322f92f2a2b"}],"title":"bpf: Don't resurrect a scalar id dropped by collect_linked_regs()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-98042","datePublished":"2026-09-25T10:23:54.242Z","dateReserved":"2026-09-25T10:19:56.071Z","dateUpdated":"2026-09-25T10:23:54.242Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-25 11:17:32","lastModifiedDate":"2026-09-25 11:17:32","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"98042","Ordinal":"1","Title":"bpf: Don't resurrect a scalar id dropped by collect_linked_regs(","CVE":"CVE-2026-98042","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"98042","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Don't resurrect a scalar id dropped by collect_linked_regs()\n\ncheck_cond_jmp_op() copies the compared registers into\nenv->{false,true}_reg{1,2} before collect_linked_regs() runs and copies\nthose snapshots back into both branch states afterwards.\n\ncollect_linked_regs() records at most LINKED_REGS_MAX members of a\nlinked registers group in the jump history and calls clear_scalar_id()\nfor every member that does not fit. The compared register is not exempt\nfrom that.\n\nAs a consequence, sync_linked_regs() might adjust ranges for more\nregisters than bpf_bt_sync_linked_regs() can propagate precision to.\n\nCollect the linked registers before the snapshots are taken instead.\nThis might lead to some unnecessary clear_scalar_id's, but from\nprevious testing situations with many linked registers are\nextremely rare.","Type":"Description","Title":"bpf: Don't resurrect a scalar id dropped by collect_linked_regs("}]}}}