{"id":"CVE-2026-43035","title":"net: sched: cls_api: fix tc_chain_fill_node to initialize tcm_info to zero to prevent an info-leak","summary":"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 initializ…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e < 903c3405cfcc7700260e456ab66a5867586c9e69","Linux >= 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e < 71a3eda7e850ae844cb8993065f4e410c11a46ce","Linux >= 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e < 4ae5d23f51fb91d7d1140c6f1ba77ab0756054c3","Linux >= 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e < e35f5195cd44ff4053fbc5d71ea97681728a0099","Linux >= 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e < d6db08484c6cb3d4ad696246f9d288eceba2a078","Linux >= 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e < 906997ea3766c24fbbf9cc4bf17c047315bbd138","Linux >= 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e < 1091b3c174441a52fdbb92e2fe00338f9371a91c","Linux >= 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e < e6e3eb5ee89ac4c163d46429391c889a1bb5e404","Linux 4.19"],"published":"2026-05-01","updated":"2026-09-08","sourceUpdated":"2026-09-08T08:48:38.121Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-43035","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"}],"tags":["cve.org"],"epss":0.00129,"epssPercentile":0.02885,"ingestedAt":"2026-09-08T15:33:26.989Z","slug":"CVE-2026-43035","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e < 903c3405cfcc7700260e456ab66a5867586c9e69`\n- `Linux >= 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e < 71a3eda7e850ae844cb8993065f4e410c11a46ce`\n- `Linux >= 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e < 4ae5d23f51fb91d7d1140c6f1ba77ab0756054c3`\n- `Linux >= 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e < e35f5195cd44ff4053fbc5d71ea97681728a0099`\n- `Linux >= 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e < d6db08484c6cb3d4ad696246f9d288eceba2a078`\n- `Linux >= 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e < 906997ea3766c24fbbf9cc4bf17c047315bbd138`\n- `Linux >= 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e < 1091b3c174441a52fdbb92e2fe00338f9371a91c`\n- `Linux >= 32a4f5ecd7381f30ae3bb36dea77a150ba68af2e < e6e3eb5ee89ac4c163d46429391c889a1bb5e404`\n- `Linux 4.19`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}