{"id":"CVE-2026-64078","state":"PUBLISHED","title":"netfilter: x_tables: add and use xtables_unregister_table_exit","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: x_tables: add and use xtables_unregister_table_exit\n\nPrevious change added xtables_unregister_table_pre_exit to detach the\ntable from the packetpath and to unlink it from the active table list.\nIn case of rmmod, userspace that is doing set/getsockopt for this table\nwill not be able to re-instantiate the table:\n 1. The larval table has been removed already\n 2. existing instantiated table is no longer on the xt pernet table list.\n\nThis adds the second stage helper:\n\nunlink the table from the dying list, free the hook ops (if any) and do\nthe audit notification.  It replaces xt_unregister_table().","publishedAt":"2026-07-19T15:39:51.582Z","updatedAt":"2026-08-05T12:38:58.654Z","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":"fdacd57c79b79a03c7ca88f706ad9fb7b46831c1","status":"affected","lessThan":"86ee5bc9c0f0e652e19f395675a432de11b75514","versionType":"git"},{"version":"fdacd57c79b79a03c7ca88f706ad9fb7b46831c1","status":"affected","lessThan":"8026e5163cca1d1db436c7bfb89ddea8b5e8c2cf","versionType":"git"},{"version":"fdacd57c79b79a03c7ca88f706ad9fb7b46831c1","status":"affected","lessThan":"b4597d5fd7d2f8cebfffd40dffb5e003cc78964c","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/linux/netfilter/x_tables.h","net/ipv4/netfilter/arp_tables.c","net/ipv4/netfilter/ip_tables.c","net/ipv4/netfilter/iptable_nat.c","net/ipv6/netfilter/ip6_tables.c","net/ipv6/netfilter/ip6table_nat.c","net/netfilter/x_tables.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","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":["include/linux/netfilter/x_tables.h","net/ipv4/netfilter/arp_tables.c","net/ipv4/netfilter/ip_tables.c","net/ipv4/netfilter/iptable_nat.c","net/ipv6/netfilter/ip6_tables.c","net/ipv6/netfilter/ip6table_nat.c","net/netfilter/x_tables.c"]}],"references":["https://git.kernel.org/stable/c/86ee5bc9c0f0e652e19f395675a432de11b75514","https://git.kernel.org/stable/c/8026e5163cca1d1db436c7bfb89ddea8b5e8c2cf","https://git.kernel.org/stable/c/b4597d5fd7d2f8cebfffd40dffb5e003cc78964c"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64078.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64078","state":"PUBLISHED","datePublished":"2026-07-19T15:39:51.582Z","dateUpdated":"2026-08-05T12:38:58.654Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T07:54:57.031Z"},"containers":{"cna":{"title":"netfilter: x_tables: add and use xtables_unregister_table_exit","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: x_tables: add and use xtables_unregister_table_exit\n\nPrevious change added xtables_unregister_table_pre_exit to detach the\ntable from the packetpath and to unlink it from the active table list.\nIn case of rmmod, userspace that is doing set/getsockopt for this table\nwill not be able to re-instantiate the table:\n 1. The larval table has been removed already\n 2. existing instantiated table is no longer on the xt pernet table list.\n\nThis adds the second stage helper:\n\nunlink the table from the dying list, free the hook ops (if any) and do\nthe audit notification.  It replaces xt_unregister_table()."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"fdacd57c79b79a03c7ca88f706ad9fb7b46831c1","status":"affected","lessThan":"86ee5bc9c0f0e652e19f395675a432de11b75514","versionType":"git"},{"version":"fdacd57c79b79a03c7ca88f706ad9fb7b46831c1","status":"affected","lessThan":"8026e5163cca1d1db436c7bfb89ddea8b5e8c2cf","versionType":"git"},{"version":"fdacd57c79b79a03c7ca88f706ad9fb7b46831c1","status":"affected","lessThan":"b4597d5fd7d2f8cebfffd40dffb5e003cc78964c","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/linux/netfilter/x_tables.h","net/ipv4/netfilter/arp_tables.c","net/ipv4/netfilter/ip_tables.c","net/ipv4/netfilter/iptable_nat.c","net/ipv6/netfilter/ip6_tables.c","net/ipv6/netfilter/ip6table_nat.c","net/netfilter/x_tables.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","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":["include/linux/netfilter/x_tables.h","net/ipv4/netfilter/arp_tables.c","net/ipv4/netfilter/ip_tables.c","net/ipv4/netfilter/iptable_nat.c","net/ipv6/netfilter/ip6_tables.c","net/ipv6/netfilter/ip6table_nat.c","net/netfilter/x_tables.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/86ee5bc9c0f0e652e19f395675a432de11b75514"},{"url":"https://git.kernel.org/stable/c/8026e5163cca1d1db436c7bfb89ddea8b5e8c2cf"},{"url":"https://git.kernel.org/stable/c/b4597d5fd7d2f8cebfffd40dffb5e003cc78964c"}],"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 only through local iptables/arptables setsockopt/getsockopt on `IPPROTO_IP`/`IPPROTO_IPV6` sockets (`do_ipt_set_ctl`/`do_ipt_get_ctl`), not by processing remote network packets.\nAC:L - Exploitation is a race between concurrent setsockopt traffic and netns teardown or `rmmod`; the attacker controls both sides (one thread hammering iptables, another deleting the netns or unloading the module) and can retry until the window is hit.\nPR:L - All vulnerable paths require `CAP_NET_ADMIN` in the target network namespace (`ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)`), which an unprivileged user can obtain inside a user/network namespace via `unshare`.\nUI:N - No victim interaction is required beyond the attacker’s own namespace lifecycle and iptables syscalls.\nS:U - Impact is confined to kernel memory corruption/privilege impact within the same kernel security domain; it is not a cross-VM or cross-container boundary escape.\nC:H - The teardown race leaves `xt_table`/`xt_table_info` reachable via setsockopt while `pre_exit`/`exit` frees them, creating a classic kernel heap use-after-free that can be turned into arbitrary memory disclosure.\nI:H - Concurrent `xt_replace_table()` against a table being torn down can corrupt or replace freed `xt_table_info` memory, enabling arbitrary kernel writes and potential privilege escalation.\nA:H - The race during `cleanup_net` or module unload can trigger kernel oops/panic from use-after-free or leave tables in an unrecoverable broken state affecting system availability."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T12:38:58.654Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"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"}}}}}