{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-43035", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:55.977Z", "datePublished": "2026-05-01T14:15:33.922Z", "dateUpdated": "2026-05-01T14:15:33.922Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-01T14:15:33.922Z"}, "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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sched/cls_api.c"], "versions": [{"version": "32a4f5ecd7381f30ae3bb36dea77a150ba68af2e", "lessThan": "903c3405cfcc7700260e456ab66a5867586c9e69", "status": "affected", "versionType": "git"}, {"version": "32a4f5ecd7381f30ae3bb36dea77a150ba68af2e", "lessThan": "71a3eda7e850ae844cb8993065f4e410c11a46ce", "status": "affected", "versionType": "git"}, {"version": "32a4f5ecd7381f30ae3bb36dea77a150ba68af2e", "lessThan": "4ae5d23f51fb91d7d1140c6f1ba77ab0756054c3", "status": "affected", "versionType": "git"}, {"version": "32a4f5ecd7381f30ae3bb36dea77a150ba68af2e", "lessThan": "e35f5195cd44ff4053fbc5d71ea97681728a0099", "status": "affected", "versionType": "git"}, {"version": "32a4f5ecd7381f30ae3bb36dea77a150ba68af2e", "lessThan": "d6db08484c6cb3d4ad696246f9d288eceba2a078", "status": "affected", "versionType": "git"}, {"version": "32a4f5ecd7381f30ae3bb36dea77a150ba68af2e", "lessThan": "906997ea3766c24fbbf9cc4bf17c047315bbd138", "status": "affected", "versionType": "git"}, {"version": "32a4f5ecd7381f30ae3bb36dea77a150ba68af2e", "lessThan": "1091b3c174441a52fdbb92e2fe00338f9371a91c", "status": "affected", "versionType": "git"}, {"version": "32a4f5ecd7381f30ae3bb36dea77a150ba68af2e", "lessThan": "e6e3eb5ee89ac4c163d46429391c889a1bb5e404", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sched/cls_api.c"], "versions": [{"version": "4.19", "status": "affected"}, {"version": "0", "lessThan": "4.19", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.253", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.203", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.168", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.134", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.81", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.22", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.12", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "5.10.253"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "5.15.203"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.1.168"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.6.134"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.12.81"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.18.22"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "6.19.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19", "versionEndExcluding": "7.0"}]}]}], "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"}}}}

{}

{"cveTags": [], "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."}], "id": "CVE-2026-43035", "lastModified": "2026-05-01T15:24:14.893", "metrics": {}, "published": "2026-05-01T15:16:48.147", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1091b3c174441a52fdbb92e2fe00338f9371a91c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4ae5d23f51fb91d7d1140c6f1ba77ab0756054c3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/71a3eda7e850ae844cb8993065f4e410c11a46ce"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/903c3405cfcc7700260e456ab66a5867586c9e69"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/906997ea3766c24fbbf9cc4bf17c047315bbd138"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d6db08484c6cb3d4ad696246f9d288eceba2a078"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e35f5195cd44ff4053fbc5d71ea97681728a0099"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e6e3eb5ee89ac4c163d46429391c889a1bb5e404"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: net: sched: cls_api: fix tc_chain_fill_node to initialize tcm_info to zero to prevent an info-leak", "id": "2464411", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464411"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-908", "details": ["A flaw was found in the Linux kernel. A local user can exploit a vulnerability in the `tc_chain_fill_node()` function, which fails to initialize the `tcm_info` field of the `struct tcmsg` to zero. This oversight leads to an information disclosure, as uninitialized kernel heap memory is leaked to userspace through this 4-byte field. This could allow an attacker to gain sensitive information from the kernel's memory."], "name": "CVE-2026-43035", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-43035\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43035\nhttps://lore.kernel.org/linux-cve-announce/2026050102-CVE-2026-43035-2731@gregkh/T"], "threat_severity": "Moderate"}