{"id":"CVE-2026-53211","state":"PUBLISHED","title":"netfilter: nft_meta_bridge: fix stale stack leak via IIFHWADDR register","description":"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->dev_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.","publishedAt":"2026-06-25T08:39:16.234Z","updatedAt":"2026-06-25T08:39:16.234Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"cbd2257dc96e3e46217540fcb095a757ffa20d96","status":"affected","lessThan":"07acb9798477535933bd658ac9fa85b6cb10d995","versionType":"git"},{"version":"cbd2257dc96e3e46217540fcb095a757ffa20d96","status":"affected","lessThan":"f1e81d571e375d10e50e852223593493d98c1bac","versionType":"git"},{"version":"cbd2257dc96e3e46217540fcb095a757ffa20d96","status":"affected","lessThan":"c7d573551f9286100a055ef696cde6af54549677","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bridge/netfilter/nft_meta_bridge.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.18","versionType":"semver"},{"version":"6.18.36","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.13","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bridge/netfilter/nft_meta_bridge.c"]}],"references":["https://git.kernel.org/stable/c/07acb9798477535933bd658ac9fa85b6cb10d995","https://git.kernel.org/stable/c/f1e81d571e375d10e50e852223593493d98c1bac","https://git.kernel.org/stable/c/c7d573551f9286100a055ef696cde6af54549677"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/53xxx/CVE-2026-53211.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53211","state":"PUBLISHED","datePublished":"2026-06-25T08:39:16.234Z","dateUpdated":"2026-06-25T08:39:16.234Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-06-09T07:44:35.391Z"},"containers":{"cna":{"title":"netfilter: nft_meta_bridge: fix stale stack leak via IIFHWADDR register","descriptions":[{"lang":"en","value":"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->dev_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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"cbd2257dc96e3e46217540fcb095a757ffa20d96","status":"affected","lessThan":"07acb9798477535933bd658ac9fa85b6cb10d995","versionType":"git"},{"version":"cbd2257dc96e3e46217540fcb095a757ffa20d96","status":"affected","lessThan":"f1e81d571e375d10e50e852223593493d98c1bac","versionType":"git"},{"version":"cbd2257dc96e3e46217540fcb095a757ffa20d96","status":"affected","lessThan":"c7d573551f9286100a055ef696cde6af54549677","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bridge/netfilter/nft_meta_bridge.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.18","versionType":"semver"},{"version":"6.18.36","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.13","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bridge/netfilter/nft_meta_bridge.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/07acb9798477535933bd658ac9fa85b6cb10d995"},{"url":"https://git.kernel.org/stable/c/f1e81d571e375d10e50e852223593493d98c1bac"},{"url":"https://git.kernel.org/stable/c/c7d573551f9286100a055ef696cde6af54549677"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-06-25T08:39:16.234Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"6.18.36"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"7.0.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}