{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64076","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-07-19T07:54:57.031Z","datePublished":"2026-07-19T15:39:50.346Z","dateUpdated":"2026-08-05T12:38:56.509Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T12:38:56.509Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: bridge: eb_tables: close module init race\n\nsashiko reports for unrelated patch:\n Does the core ebtables initialization in ebtables.c suffer from a similar race?\n Once nf_register_sockopt() completes, the sockopts are exposed globally.\n\nsockopt has to be registered last, just like in ip/ip6/arptables."}],"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 - Exploitation requires a local setsockopt/getsockopt syscall on a PF_INET socket; the vulnerable ebtables handlers are reached via ip_setsockopt → nf_setsockopt, not via remote bridge frame or network packet processing.\nAC:L - The attacker can hammer concurrent setsockopt/getsockopt calls in a tight loop while waiting for or triggering ebtables module load, controlling the sockopt side of the init race window between nf_register_sockopt() and register_pernet_subsys().\nPR:L - All ebtables sockopt entry points (do_ebt_set_ctl/do_ebt_get_ctl) gate on ns_capable(net->user_ns, CAP_NET_ADMIN), which is obtainable by an unprivileged user via user namespaces (unshare -Urn).\nUI:N - No victim interaction is required; exploitation is fully attacker-driven through concurrent syscalls during module initialization.\nS:U - Impact is confined to kernel memory and integrity within the same security authority; this is not a VM escape, sandbox breakout, or cross-tenant boundary crossing.\nC:H - Before pernet registration, net_generic(net, 0) returns the net_generic.len field misinterpreted as a pointer, and list_for_each_entry on the resulting bogus ebt_pernet->tables can read unintended kernel memory before faulting.\nI:H - The same uninitialized net_generic lookup drives list traversal and subsequent ebtables table management paths (do_replace/do_update_counters) that perform kernel heap list operations and rule data writes against corrupted state.\nA:H - Hitting the race window causes invalid pointer dereference during list iteration, producing a kernel oops/panic and denying system availability."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bridge/netfilter/ebtables.c"],"versions":[{"version":"5b53951cfc85329d29df9d07b1e905f4563546a5","lessThan":"c647e2a21bbbaceda6cdb8a44a56f44d231dc4b4","status":"affected","versionType":"git"},{"version":"5b53951cfc85329d29df9d07b1e905f4563546a5","lessThan":"02d999dc69b3918dba2414932b5d95f1f75c76cb","status":"affected","versionType":"git"},{"version":"5b53951cfc85329d29df9d07b1e905f4563546a5","lessThan":"27414ff1b287ea9a2a11675149ec28e05539f3cc","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bridge/netfilter/ebtables.c"],"versions":[{"version":"5.13","status":"affected"},{"version":"0","lessThan":"5.13","status":"unaffected","versionType":"semver"},{"version":"6.18.34","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.0.11","lessThanOrEqual":"7.0.*","status":"unaffected","versionType":"semver"},{"version":"7.1","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"6.18.34"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"7.0.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"7.1"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/c647e2a21bbbaceda6cdb8a44a56f44d231dc4b4"},{"url":"https://git.kernel.org/stable/c/02d999dc69b3918dba2414932b5d95f1f75c76cb"},{"url":"https://git.kernel.org/stable/c/27414ff1b287ea9a2a11675149ec28e05539f3cc"}],"title":"netfilter: bridge: eb_tables: close module init race","x_generator":{"engine":"bippy-1.2.0"}}}}