CVE-2026-64078

{"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\u2019s 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"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "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"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "86ee5bc9c0f0e652e19f395675a432de11b75514", "status": "affected", "version": "fdacd57c79b79a03c7ca88f706ad9fb7b46831c1", "versionType": "git"}, {"lessThan": "8026e5163cca1d1db436c7bfb89ddea8b5e8c2cf", "status": "affected", "version": "fdacd57c79b79a03c7ca88f706ad9fb7b46831c1", "versionType": "git"}, {"lessThan": "b4597d5fd7d2f8cebfffd40dffb5e003cc78964c", "status": "affected", "version": "fdacd57c79b79a03c7ca88f706ad9fb7b46831c1", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "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"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.15"}, {"lessThan": "5.15", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.34", "versionType": "semver"}, {"lessThanOrEqual": "7.0.*", "status": "unaffected", "version": "7.0.11", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "1111B859-7CF3-4F75-8724-625922494032", "versionEndExcluding": "6.18.34", "versionStartIncluding": "5.15", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "0520D091-FC52-4A50-AF07-70AE7D08B750", "versionEndExcluding": "7.0.11", "versionStartIncluding": "6.19", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*", "matchCriteriaId": "B1EF7059-E670-45F4-B422-54C40FA86390", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*", "matchCriteriaId": "0D38F0BF-A728-4133-A358-D44A2F7EE6D6", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*", "matchCriteriaId": "EC732D08-5F7B-46D9-B154-E60C7F4F0A97", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "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()."}], "id": "CVE-2026-64078", "lastModified": "2026-09-03T14:32:51.083", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-07-19T16:17:48.407", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8026e5163cca1d1db436c7bfb89ddea8b5e8c2cf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/86ee5bc9c0f0e652e19f395675a432de11b75514"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b4597d5fd7d2f8cebfffd40dffb5e003cc78964c"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: netfilter: x_tables: add and use xtables_unregister_table_exit", "id": "2502554", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502554"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-459", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnetfilter: x_tables: add and use xtables_unregister_table_exit\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:\n1. The larval table has been removed already\n2. existing instantiated table is no longer on the xt pernet table list.\nThis adds the second stage helper:\nunlink the table from the dying list, free the hook ops (if any) and do\nthe audit notification. It replaces xt_unregister_table().", "A flaw was found in the Linux kernel's netfilter x_tables component. This vulnerability occurs when a userspace process attempts to re-instantiate a netfilter table after the module has been removed. Due to an incomplete unregistration process, the table cannot be properly re-established, potentially leading to a denial of service for network filtering functionalities. This issue is resolved by ensuring a complete unregistration of the table."], "name": "CVE-2026-64078", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "impact": "important", "package_name": "erlang27", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64078\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64078\nhttps://lore.kernel.org/linux-cve-announce/2026071914-CVE-2026-64078-ff87@gregkh/T"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fdacd57c79b79a03c7ca88f706ad9fb7b46831c1,86ee5bc9c0f0e652e19f395675a432de11b75514)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fdacd57c79b79a03c7ca88f706ad9fb7b46831c1,8026e5163cca1d1db436c7bfb89ddea8b5e8c2cf)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fdacd57c79b79a03c7ca88f706ad9fb7b46831c1,b4597d5fd7d2f8cebfffd40dffb5e003cc78964c)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.15"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.15)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.34,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.11,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-07-21T09:00:03.294031+00:00", "updated": "2026-09-03T17:00:06.886389+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}