{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64078", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.031Z", "datePublished": "2026-07-19T15:39:51.582Z", "dateUpdated": "2026-08-05T12:38:58.654Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:38:58.654Z" }, "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()." } ], "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "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" ], "versions": [ { "version": "fdacd57c79b79a03c7ca88f706ad9fb7b46831c1", "lessThan": "86ee5bc9c0f0e652e19f395675a432de11b75514", "status": "affected", "versionType": "git" }, { "version": "fdacd57c79b79a03c7ca88f706ad9fb7b46831c1", "lessThan": "8026e5163cca1d1db436c7bfb89ddea8b5e8c2cf", "status": "affected", "versionType": "git" }, { "version": "fdacd57c79b79a03c7ca88f706ad9fb7b46831c1", "lessThan": "b4597d5fd7d2f8cebfffd40dffb5e003cc78964c", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "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" ], "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "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": "5.15", "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" } ] } ] } ], "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" } ], "title": "netfilter: x_tables: add and use xtables_unregister_table_exit", "x_generator": { "engine": "bippy-1.2.0" } } } }