171 lines
9.2 KiB
JSON
171 lines
9.2 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-64078",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-07-19T07:54:57.031Z",
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"datePublished": "2026-07-19T15:39:51.582Z",
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"dateUpdated": "2026-08-05T12:38:58.654Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:38:58.654Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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()."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"include/linux/netfilter/x_tables.h",
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"net/ipv4/netfilter/arp_tables.c",
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"net/ipv4/netfilter/ip_tables.c",
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"net/ipv4/netfilter/iptable_nat.c",
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"net/ipv6/netfilter/ip6_tables.c",
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"net/ipv6/netfilter/ip6table_nat.c",
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"net/netfilter/x_tables.c"
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],
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"versions": [
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{
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"version": "fdacd57c79b79a03c7ca88f706ad9fb7b46831c1",
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"lessThan": "86ee5bc9c0f0e652e19f395675a432de11b75514",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "fdacd57c79b79a03c7ca88f706ad9fb7b46831c1",
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"lessThan": "8026e5163cca1d1db436c7bfb89ddea8b5e8c2cf",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "fdacd57c79b79a03c7ca88f706ad9fb7b46831c1",
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"lessThan": "b4597d5fd7d2f8cebfffd40dffb5e003cc78964c",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"include/linux/netfilter/x_tables.h",
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"net/ipv4/netfilter/arp_tables.c",
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"net/ipv4/netfilter/ip_tables.c",
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"net/ipv4/netfilter/iptable_nat.c",
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"net/ipv6/netfilter/ip6_tables.c",
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"net/ipv6/netfilter/ip6table_nat.c",
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"net/netfilter/x_tables.c"
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],
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"versions": [
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{
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"version": "5.15",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "5.15",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.34",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.0.11",
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"lessThanOrEqual": "7.0.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.15",
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"versionEndExcluding": "6.18.34"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.15",
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"versionEndExcluding": "7.0.11"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.15",
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"versionEndExcluding": "7.1"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/86ee5bc9c0f0e652e19f395675a432de11b75514"
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},
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{
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"url": "https://git.kernel.org/stable/c/8026e5163cca1d1db436c7bfb89ddea8b5e8c2cf"
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},
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{
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"url": "https://git.kernel.org/stable/c/b4597d5fd7d2f8cebfffd40dffb5e003cc78964c"
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}
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],
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"title": "netfilter: x_tables: add and use xtables_unregister_table_exit",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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} |