{"id":"CVE-2026-43035","summary":"net: sched: cls_api: fix tc_chain_fill_node to initialize tcm_info to zero to prevent an info-leak","details":"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.","modified":"2026-07-04T18:29:24.047810180Z","published":"2026-05-01T14:15:33.922Z","related":["SUSE-SU-2026:22433-1","SUSE-SU-2026:22436-1","SUSE-SU-2026:22458-1","SUSE-SU-2026:22460-1","SUSE-SU-2026:2722-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43035.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1091b3c174441a52fdbb92e2fe00338f9371a91c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4ae5d23f51fb91d7d1140c6f1ba77ab0756054c3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/71a3eda7e850ae844cb8993065f4e410c11a46ce"},{"type":"WEB","url":"https://git.kernel.org/stable/c/903c3405cfcc7700260e456ab66a5867586c9e69"},{"type":"WEB","url":"https://git.kernel.org/stable/c/906997ea3766c24fbbf9cc4bf17c047315bbd138"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d6db08484c6cb3d4ad696246f9d288eceba2a078"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e35f5195cd44ff4053fbc5d71ea97681728a0099"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e6e3eb5ee89ac4c163d46429391c889a1bb5e404"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43035.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43035"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"32a4f5ecd7381f30ae3bb36dea77a150ba68af2e"},{"fixed":"903c3405cfcc7700260e456ab66a5867586c9e69"},{"fixed":"71a3eda7e850ae844cb8993065f4e410c11a46ce"},{"fixed":"4ae5d23f51fb91d7d1140c6f1ba77ab0756054c3"},{"fixed":"e35f5195cd44ff4053fbc5d71ea97681728a0099"},{"fixed":"d6db08484c6cb3d4ad696246f9d288eceba2a078"},{"fixed":"906997ea3766c24fbbf9cc4bf17c047315bbd138"},{"fixed":"1091b3c174441a52fdbb92e2fe00338f9371a91c"},{"fixed":"e6e3eb5ee89ac4c163d46429391c889a1bb5e404"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43035.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.19.0"},{"fixed":"5.10.253"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.203"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.168"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.134"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.81"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.22"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.12"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-43035.json"}}],"schema_version":"1.7.5"}