{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64077", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.031Z", "datePublished": "2026-07-19T15:39:50.966Z", "dateUpdated": "2026-08-05T12:38:57.583Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:38:57.583Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ebtables: move to two-stage removal scheme\n\nLike previous patches for x_tables, follow same pattern in ebtables.\nWe can't reuse xt helpers: ebt_table struct layout is incompatible.\n\ntable->ops assignment is now done while still holding the ebt mutex\nto make sure we never expose partially-filled table struct."}], "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 through ebtables setsockopt/getsockopt administration syscalls (do_ebt_set_ctl/do_ebt_get_ctl), not through processing of remotely received network or bridge frames.\nAC:L - An attacker can reliably win the race by running concurrent threads\u2014one issuing ebtables setsockopt to register or modify a table while another destroys the network namespace or triggers module teardown.\nPR:L - All entry paths require CAP_NET_ADMIN in the target network namespace, which an unprivileged local attacker can obtain via user+network namespaces (unshare -Urn).\nUI:N - Exploitation requires no action from any other user or administrator beyond the attacker\u2019s own local namespace and sockopt operations.\nS:U - Impact is confined to kernel memory and privileges on the host; this is a standard kernel race/UAF issue, not a VM, container, or IOMMU boundary escape.\nC:H - The missing two-stage removal allows concurrent setsockopt to use an ebt_table while __ebt_unregister_table() frees its backing structures, creating a use-after-free that can be leveraged for arbitrary kernel memory disclosure.\nI:H - The teardown race and partially-initialized table exposure enable heap use-after-free conditions that can be developed into arbitrary kernel memory writes or code execution via heap grooming.\nA:H - The NULL ops race causes a general protection fault in nf_unregister_net_hooks(), and the concurrent teardown UAF can trigger kernel oops, panic, or denial of service."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/bridge/netfilter/ebtable_broute.c", "net/bridge/netfilter/ebtable_filter.c", "net/bridge/netfilter/ebtable_nat.c", "net/bridge/netfilter/ebtables.c"], "versions": [{"version": "87663c39f898b18905499126548da61450628682", "lessThan": "739d5dac7b2da44a756aa4d758ee3f1ccf5a27f1", "status": "affected", "versionType": "git"}, {"version": "87663c39f898b18905499126548da61450628682", "lessThan": "ef395579a7631a06d61969fc712eb80402231b89", "status": "affected", "versionType": "git"}, {"version": "87663c39f898b18905499126548da61450628682", "lessThan": "b7f0544d86d439cb946515d2ef6a0a75e8626710", "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/ebtable_broute.c", "net/bridge/netfilter/ebtable_filter.c", "net/bridge/netfilter/ebtable_nat.c", "net/bridge/netfilter/ebtables.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/739d5dac7b2da44a756aa4d758ee3f1ccf5a27f1"}, {"url": "https://git.kernel.org/stable/c/ef395579a7631a06d61969fc712eb80402231b89"}, {"url": "https://git.kernel.org/stable/c/b7f0544d86d439cb946515d2ef6a0a75e8626710"}], "title": "netfilter: ebtables: move to two-stage removal scheme", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/bridge/netfilter/ebtable_broute.c", "net/bridge/netfilter/ebtable_filter.c", "net/bridge/netfilter/ebtable_nat.c", "net/bridge/netfilter/ebtables.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "739d5dac7b2da44a756aa4d758ee3f1ccf5a27f1", "status": "affected", "version": "87663c39f898b18905499126548da61450628682", "versionType": "git"}, {"lessThan": "ef395579a7631a06d61969fc712eb80402231b89", "status": "affected", "version": "87663c39f898b18905499126548da61450628682", "versionType": "git"}, {"lessThan": "b7f0544d86d439cb946515d2ef6a0a75e8626710", "status": "affected", "version": "87663c39f898b18905499126548da61450628682", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/bridge/netfilter/ebtable_broute.c", "net/bridge/netfilter/ebtable_filter.c", "net/bridge/netfilter/ebtable_nat.c", "net/bridge/netfilter/ebtables.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"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ebtables: move to two-stage removal scheme\n\nLike previous patches for x_tables, follow same pattern in ebtables.\nWe can't reuse xt helpers: ebt_table struct layout is incompatible.\n\ntable->ops assignment is now done while still holding the ebt mutex\nto make sure we never expose partially-filled table struct."}], "id": "CVE-2026-64077", "lastModified": "2026-07-30T14:59:47.950", "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": "2026-07-19T16:17:48.313", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/739d5dac7b2da44a756aa4d758ee3f1ccf5a27f1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b7f0544d86d439cb946515d2ef6a0a75e8626710"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ef395579a7631a06d61969fc712eb80402231b89"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: netfilter: ebtables: move to two-stage removal scheme", "id": "2502625", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502625"}, "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-413", "details": ["A flaw was found in the Linux kernel's netfilter ebtables component. A concurrency issue exists during the two-stage removal scheme where the `table->ops` assignment could expose a partially-filled table structure if the `ebt` mutex is not held. This could lead to unpredictable system behavior."], "name": "CVE-2026-64077", "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"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64077\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64077\nhttps://lore.kernel.org/linux-cve-announce/2026071914-CVE-2026-64077-eafe@gregkh/T"], "threat_severity": "Moderate"}

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