CVE-2026-64076

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Exploitation requires a local setsockopt/getsockopt syscall on a PF_INET socket; the vulnerable ebtables handlers are reached via ip_setsockopt \u2192 nf_setsockopt, not via remote bridge frame or network packet processing.\nAC:L - The attacker can hammer concurrent setsockopt/getsockopt calls in a tight loop while waiting for or triggering ebtables module load, controlling the sockopt side of the init race window between nf_register_sockopt() and register_pernet_subsys().\nPR:L - All ebtables sockopt entry points (do_ebt_set_ctl/do_ebt_get_ctl) gate on ns_capable(net->user_ns, CAP_NET_ADMIN), which is obtainable by an unprivileged user via user namespaces (unshare -Urn).\nUI:N - No victim interaction is required; exploitation is fully attacker-driven through concurrent syscalls during module initialization.\nS:U - Impact is confined to kernel memory and integrity within the same security authority; this is not a VM escape, sandbox breakout, or cross-tenant boundary crossing.\nC:H - Before pernet registration, net_generic(net, 0) returns the net_generic.len field misinterpreted as a pointer, and list_for_each_entry on the resulting bogus ebt_pernet->tables can read unintended kernel memory before faulting.\nI:H - 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{"bugzilla": {"description": "kernel: netfilter: bridge: eb_tables: close module init race", "id": "2502478", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502478"}, "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-820", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnetfilter: bridge: eb_tables: close module init race\nsashiko reports for unrelated patch:\nDoes the core ebtables initialization in ebtables.c suffer from a similar race?\nOnce nf_register_sockopt() completes, the sockopts are exposed globally.\nsockopt has to be registered last, just like in ip/ip6/arptables.", "A flaw was found in the Linux kernel's Netfilter `eb_tables` module. A race condition during the module's initialization allows `sockopts` to be exposed globally before they are fully registered. This could potentially lead to unexpected behavior or security vulnerabilities if exploited by a local attacker."], "name": "CVE-2026-64076", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "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-2026-64076\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64076\nhttps://lore.kernel.org/linux-cve-announce/2026071914-CVE-2026-64076-4346@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5b53951cfc85329d29df9d07b1e905f4563546a5,c647e2a21bbbaceda6cdb8a44a56f44d231dc4b4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5b53951cfc85329d29df9d07b1e905f4563546a5,02d999dc69b3918dba2414932b5d95f1f75c76cb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5b53951cfc85329d29df9d07b1e905f4563546a5,27414ff1b287ea9a2a11675149ec28e05539f3cc)"}}], "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": "5.13"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.13)"}}, {"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": "semver", "value": "[7.1.0,*]"}}], "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": "2026-07-21T09:15:02.490608+00:00", "updated": "2026-10-20T03:15:08.403633+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-362", "CWE-820"]}