{"id":"CVE-2026-53211","summary":"netfilter: nft_meta_bridge: fix stale stack leak via IIFHWADDR register","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_meta_bridge: fix stale stack leak via IIFHWADDR register\n\nNFT_META_BRI_IIFHWADDR declares its destination register with\nlen = ETH_ALEN (6 bytes), which the register-init tracking rounds up to\ntwo 32-bit registers (8 bytes). nft_meta_bridge_get_eval() then does\nmemcpy(dest, br_dev-\u003edev_addr, ETH_ALEN), writing only 6 bytes and\nleaving the upper 2 bytes of the second register as uninitialised\nnft_do_chain() stack. A downstream load of that register span leaks\nthose stale bytes to userspace.\n\nZero the second register before the memcpy so the full declared span is\nwritten.","modified":"2026-07-08T08:07:24.299733421Z","published":"2026-06-25T08:39:16.234Z","related":["CGA-jwqp-7rfm-mjh5"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53211.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/07acb9798477535933bd658ac9fa85b6cb10d995"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c7d573551f9286100a055ef696cde6af54549677"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f1e81d571e375d10e50e852223593493d98c1bac"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53211.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53211"},{"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":"cbd2257dc96e3e46217540fcb095a757ffa20d96"},{"fixed":"07acb9798477535933bd658ac9fa85b6cb10d995"},{"fixed":"f1e81d571e375d10e50e852223593493d98c1bac"},{"fixed":"c7d573551f9286100a055ef696cde6af54549677"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53211.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.18.0"},{"fixed":"6.18.36"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.13"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53211.json"}}],"schema_version":"1.7.5"}