{"id":"CVE-2026-64077","state":"PUBLISHED","title":"netfilter: ebtables: move to two-stage removal scheme","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ebtables: move to two-stage removal scheme\n\nLike previous patches for x_tables, follow same pattern in ebtables.\nWe can't reuse xt helpers: ebt_table struct layout is incompatible.\n\ntable->ops assignment is now done while still holding the ebt mutex\nto make sure we never expose partially-filled table struct.","publishedAt":"2026-07-19T15:39:50.966Z","updatedAt":"2026-10-30T12:27:34.127Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"87663c39f898b18905499126548da61450628682","status":"affected","lessThan":"b37e27f5d5cbb7723644fdf089e28a216d6093ed","versionType":"git"},{"version":"87663c39f898b18905499126548da61450628682","status":"affected","lessThan":"6fe4c808b6cdb405ed64ea6e740d557bba3d7745","versionType":"git"},{"version":"87663c39f898b18905499126548da61450628682","status":"affected","lessThan":"f34e5a674afe743d1af80684d64b511f40a5c35d","versionType":"git"},{"version":"87663c39f898b18905499126548da61450628682","status":"affected","lessThan":"739d5dac7b2da44a756aa4d758ee3f1ccf5a27f1","versionType":"git"},{"version":"87663c39f898b18905499126548da61450628682","status":"affected","lessThan":"ef395579a7631a06d61969fc712eb80402231b89","versionType":"git"},{"version":"87663c39f898b18905499126548da61450628682","status":"affected","lessThan":"b7f0544d86d439cb946515d2ef6a0a75e8626710","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bridge/netfilter/ebtable_broute.c","net/bridge/netfilter/ebtable_filter.c","net/bridge/netfilter/ebtable_nat.c","net/bridge/netfilter/ebtables.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.34","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.11","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/ebtable_broute.c","net/bridge/netfilter/ebtable_filter.c","net/bridge/netfilter/ebtable_nat.c","net/bridge/netfilter/ebtables.c"]}],"references":["https://git.kernel.org/stable/c/b37e27f5d5cbb7723644fdf089e28a216d6093ed","https://git.kernel.org/stable/c/6fe4c808b6cdb405ed64ea6e740d557bba3d7745","https://git.kernel.org/stable/c/f34e5a674afe743d1af80684d64b511f40a5c35d","https://git.kernel.org/stable/c/739d5dac7b2da44a756aa4d758ee3f1ccf5a27f1","https://git.kernel.org/stable/c/ef395579a7631a06d61969fc712eb80402231b89","https://git.kernel.org/stable/c/b7f0544d86d439cb946515d2ef6a0a75e8626710"],"weaknesses":["CWE-362"],"ingestedAt":"2026-10-30T12:46:06.359Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64077.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64077","state":"PUBLISHED","datePublished":"2026-07-19T15:39:50.966Z","dateUpdated":"2026-10-30T12:27:34.127Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T07:54:57.031Z"},"containers":{"cna":{"title":"netfilter: ebtables: move to two-stage removal scheme","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ebtables: move to two-stage removal scheme\n\nLike previous patches for x_tables, follow same pattern in ebtables.\nWe can't reuse xt helpers: ebt_table struct layout is incompatible.\n\ntable->ops assignment is now done while still holding the ebt mutex\nto make sure we never expose partially-filled table struct."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"87663c39f898b18905499126548da61450628682","status":"affected","lessThan":"b37e27f5d5cbb7723644fdf089e28a216d6093ed","versionType":"git"},{"version":"87663c39f898b18905499126548da61450628682","status":"affected","lessThan":"6fe4c808b6cdb405ed64ea6e740d557bba3d7745","versionType":"git"},{"version":"87663c39f898b18905499126548da61450628682","status":"affected","lessThan":"f34e5a674afe743d1af80684d64b511f40a5c35d","versionType":"git"},{"version":"87663c39f898b18905499126548da61450628682","status":"affected","lessThan":"739d5dac7b2da44a756aa4d758ee3f1ccf5a27f1","versionType":"git"},{"version":"87663c39f898b18905499126548da61450628682","status":"affected","lessThan":"ef395579a7631a06d61969fc712eb80402231b89","versionType":"git"},{"version":"87663c39f898b18905499126548da61450628682","status":"affected","lessThan":"b7f0544d86d439cb946515d2ef6a0a75e8626710","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bridge/netfilter/ebtable_broute.c","net/bridge/netfilter/ebtable_filter.c","net/bridge/netfilter/ebtable_nat.c","net/bridge/netfilter/ebtables.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.34","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.11","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/ebtable_broute.c","net/bridge/netfilter/ebtable_filter.c","net/bridge/netfilter/ebtable_nat.c","net/bridge/netfilter/ebtables.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/b37e27f5d5cbb7723644fdf089e28a216d6093ed"},{"url":"https://git.kernel.org/stable/c/6fe4c808b6cdb405ed64ea6e740d557bba3d7745"},{"url":"https://git.kernel.org/stable/c/f34e5a674afe743d1af80684d64b511f40a5c35d"},{"url":"https://git.kernel.org/stable/c/739d5dac7b2da44a756aa4d758ee3f1ccf5a27f1"},{"url":"https://git.kernel.org/stable/c/ef395579a7631a06d61969fc712eb80402231b89"},{"url":"https://git.kernel.org/stable/c/b7f0544d86d439cb946515d2ef6a0a75e8626710"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The bug is reached through ebtables setsockopt/getsockopt administration syscalls (do_ebt_set_ctl/do_ebt_get_ctl), not through processing of remotely received network or bridge frames.\nAC:L - An attacker can reliably win the race by running concurrent threads—one issuing ebtables setsockopt to register or modify a table while another destroys the network namespace or triggers module teardown.\nPR:L - All entry paths require CAP_NET_ADMIN in the target network namespace, which an unprivileged local attacker can obtain via user+network namespaces (unshare -Urn).\nUI:N - Exploitation requires no action from any other user or administrator beyond the attacker’s own local namespace and sockopt operations.\nS:U - Impact is confined to kernel memory and privileges on the host; this is a standard kernel race/UAF issue, not a VM, container, or IOMMU boundary escape.\nC:H - The missing two-stage removal allows concurrent setsockopt to use an ebt_table while __ebt_unregister_table() frees its backing structures, creating a use-after-free that can be leveraged for arbitrary kernel memory disclosure.\nI:H - The teardown race and partially-initialized table exposure enable heap use-after-free conditions that can be developed into arbitrary kernel memory writes or code execution via heap grooming.\nA:H - The NULL ops race causes a general protection fault in nf_unregister_net_hooks(), and the concurrent teardown UAF can trigger kernel oops, panic, or denial of service."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:27:34.127Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.12.114"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.18.34"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"7.0.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-64077","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T15:36:11.050471Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-362","lang":"en","type":"CWE","description":"CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T20:28:11.430Z"}}]}}}