{"api_version":"1","generated_at":"2026-05-01T19:21:33+00:00","cve":"CVE-2026-43035","urls":{"html":"https://cve.report/CVE-2026-43035","api":"https://cve.report/api/cve/CVE-2026-43035.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-43035","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-43035"},"summary":{"title":"net: sched: cls_api: fix tc_chain_fill_node to initialize tcm_info to zero to prevent an info-leak","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: sched: cls_api: fix tc_chain_fill_node to initialize tcm_info to zero to prevent an info-leak\n\nWhen building netlink messages, tc_chain_fill_node() never initializes\nthe tcm_info field of struct tcmsg. Since the allocation is not zeroed,\nkernel heap memory is leaked to userspace through this 4-byte field.\n\nThe fix simply zeroes tcm_info alongside the other fields that are\nalready initialized.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-01 15:16:48","updated_at":"2026-05-01 15:24:14"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/1091b3c174441a52fdbb92e2fe00338f9371a91c","name":"https://git.kernel.org/stable/c/1091b3c174441a52fdbb92e2fe00338f9371a91c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e6e3eb5ee89ac4c163d46429391c889a1bb5e404","name":"https://git.kernel.org/stable/c/e6e3eb5ee89ac4c163d46429391c889a1bb5e404","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/71a3eda7e850ae844cb8993065f4e410c11a46ce","name":"https://git.kernel.org/stable/c/71a3eda7e850ae844cb8993065f4e410c11a46ce","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/903c3405cfcc7700260e456ab66a5867586c9e69","name":"https://git.kernel.org/stable/c/903c3405cfcc7700260e456ab66a5867586c9e69","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4ae5d23f51fb91d7d1140c6f1ba77ab0756054c3","name":"https://git.kernel.org/stable/c/4ae5d23f51fb91d7d1140c6f1ba77ab0756054c3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d6db08484c6cb3d4ad696246f9d288eceba2a078","name":"https://git.kernel.org/stable/c/d6db08484c6cb3d4ad696246f9d288eceba2a078","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/906997ea3766c24fbbf9cc4bf17c047315bbd138","name":"https://git.kernel.org/stable/c/906997ea3766c24fbbf9cc4bf17c047315bbd138","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e35f5195cd44ff4053fbc5d71ea97681728a0099","name":"https://git.kernel.org/stable/c/e35f5195cd44ff4053fbc5d71ea97681728a0099","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-43035","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43035","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e 903c3405cfcc7700260e456ab66a5867586c9e69 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e 71a3eda7e850ae844cb8993065f4e410c11a46ce git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e 4ae5d23f51fb91d7d1140c6f1ba77ab0756054c3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e e35f5195cd44ff4053fbc5d71ea97681728a0099 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.203 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.168 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.134 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.81 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.22 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19.12 6.19.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0 * 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":["net/sched/cls_api.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"903c3405cfcc7700260e456ab66a5867586c9e69","status":"affected","version":"32a4f5ecd7381f30ae3bb36dea77a150ba68af2e","versionType":"git"},{"lessThan":"71a3eda7e850ae844cb8993065f4e410c11a46ce","status":"affected","version":"32a4f5ecd7381f30ae3bb36dea77a150ba68af2e","versionType":"git"},{"lessThan":"4ae5d23f51fb91d7d1140c6f1ba77ab0756054c3","status":"affected","version":"32a4f5ecd7381f30ae3bb36dea77a150ba68af2e","versionType":"git"},{"lessThan":"e35f5195cd44ff4053fbc5d71ea97681728a0099","status":"affected","version":"32a4f5ecd7381f30ae3bb36dea77a150ba68af2e","versionType":"git"},{"lessThan":"d6db08484c6cb3d4ad696246f9d288eceba2a078","status":"affected","version":"32a4f5ecd7381f30ae3bb36dea77a150ba68af2e","versionType":"git"},{"lessThan":"906997ea3766c24fbbf9cc4bf17c047315bbd138","status":"affected","version":"32a4f5ecd7381f30ae3bb36dea77a150ba68af2e","versionType":"git"},{"lessThan":"1091b3c174441a52fdbb92e2fe00338f9371a91c","status":"affected","version":"32a4f5ecd7381f30ae3bb36dea77a150ba68af2e","versionType":"git"},{"lessThan":"e6e3eb5ee89ac4c163d46429391c889a1bb5e404","status":"affected","version":"32a4f5ecd7381f30ae3bb36dea77a150ba68af2e","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/sched/cls_api.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.19"},{"lessThan":"4.19","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.253","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.203","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.168","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.134","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.81","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.22","versionType":"semver"},{"lessThanOrEqual":"6.19.*","status":"unaffected","version":"6.19.12","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.0","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.253","versionStartIncluding":"4.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.203","versionStartIncluding":"4.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.168","versionStartIncluding":"4.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.134","versionStartIncluding":"4.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.81","versionStartIncluding":"4.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.22","versionStartIncluding":"4.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.19.12","versionStartIncluding":"4.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0","versionStartIncluding":"4.19","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: sched: cls_api: fix tc_chain_fill_node to initialize tcm_info to zero to prevent an info-leak\n\nWhen building netlink messages, tc_chain_fill_node() never initializes\nthe tcm_info field of struct tcmsg. Since the allocation is not zeroed,\nkernel heap memory is leaked to userspace through this 4-byte field.\n\nThe fix simply zeroes tcm_info alongside the other fields that are\nalready initialized."}],"providerMetadata":{"dateUpdated":"2026-05-01T14:15:33.922Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/903c3405cfcc7700260e456ab66a5867586c9e69"},{"url":"https://git.kernel.org/stable/c/71a3eda7e850ae844cb8993065f4e410c11a46ce"},{"url":"https://git.kernel.org/stable/c/4ae5d23f51fb91d7d1140c6f1ba77ab0756054c3"},{"url":"https://git.kernel.org/stable/c/e35f5195cd44ff4053fbc5d71ea97681728a0099"},{"url":"https://git.kernel.org/stable/c/d6db08484c6cb3d4ad696246f9d288eceba2a078"},{"url":"https://git.kernel.org/stable/c/906997ea3766c24fbbf9cc4bf17c047315bbd138"},{"url":"https://git.kernel.org/stable/c/1091b3c174441a52fdbb92e2fe00338f9371a91c"},{"url":"https://git.kernel.org/stable/c/e6e3eb5ee89ac4c163d46429391c889a1bb5e404"}],"title":"net: sched: cls_api: fix tc_chain_fill_node to initialize tcm_info to zero to prevent an info-leak","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-43035","datePublished":"2026-05-01T14:15:33.922Z","dateReserved":"2026-05-01T14:12:55.977Z","dateUpdated":"2026-05-01T14:15:33.922Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-01 15:16:48","lastModifiedDate":"2026-05-01 15:24:14","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"43035","Ordinal":"1","Title":"net: sched: cls_api: fix tc_chain_fill_node to initialize tcm_in","CVE":"CVE-2026-43035","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"43035","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: sched: cls_api: fix tc_chain_fill_node to initialize tcm_info to zero to prevent an info-leak\n\nWhen building netlink messages, tc_chain_fill_node() never initializes\nthe tcm_info field of struct tcmsg. Since the allocation is not zeroed,\nkernel heap memory is leaked to userspace through this 4-byte field.\n\nThe fix simply zeroes tcm_info alongside the other fields that are\nalready initialized.","Type":"Description","Title":"net: sched: cls_api: fix tc_chain_fill_node to initialize tcm_in"}]}}}