CVE-2026-23412

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"published": "2026-04-02T12:16:20.270", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/24f90fa3994b992d1a09003a3db2599330a5232a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/54244d54a971c26a0cd0a9073460ff71f3c51b32"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c25e0dec366ae99b7264324ce3c7cbaea34691f9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cb2bf5efdb02a2a59faf603604a1066e8266f349"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d016c216bc75c45128160593a77b864a04dbe7c0"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-416"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: netfilter: bpf: defer hook memory release until rcu readers are done", "id": "2454319", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2454319"}, "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-364", "details": ["A flaw was found in the Linux kernel's netfilter BPF (Berkeley Packet Filter) component. A local attacker could exploit this by initiating a concurrent process to dump hooks via `nfnetlink_hooks`, which triggers a use-after-free vulnerability. This could lead to system instability or a denial of service (DoS) condition."], "name": "CVE-2026-23412", "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": "Not affected", "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": "2026-04-02T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23412\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23412\nhttps://lore.kernel.org/linux-cve-announce/2026040201-CVE-2026-23412-4daa@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[84601d6ee68ae820dec97450934797046d62db4b,d016c216bc75c45128160593a77b864a04dbe7c0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[84601d6ee68ae820dec97450934797046d62db4b,cb2bf5efdb02a2a59faf603604a1066e8266f349)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[84601d6ee68ae820dec97450934797046d62db4b,c25e0dec366ae99b7264324ce3c7cbaea34691f9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[84601d6ee68ae820dec97450934797046d62db4b,54244d54a971c26a0cd0a9073460ff71f3c51b32)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[84601d6ee68ae820dec97450934797046d62db4b,24f90fa3994b992d1a09003a3db2599330a5232a)"}}], "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": "semver", "value": "6.4"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.4)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.130,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.78,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.20,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.10,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0-rc5,*]"}}], "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"}], "analysis": {"en": {"generated_at": "2026-04-28T16:50:46.464973+00:00", "value": {"mitigation_remediation": ["Update the system to the latest Linux kernel release that contains the netfilter BPF use\u2011after\u2011free fix", "If an immediate kernel upgrade is not possible, restrict or disable nfnetlink_hooks usage for non\u2011essential users to limit the exposure of this API", "Continuously monitor kernel logs for panic messages or KASAN reports indicating a use\u2011after\u2011free has occurred"], "summary": {"action": "Apply Patch", "impact": "Use\u2011After\u2011Free memory corruption (CWE\u2011416) in the Linux kernel netfilter subsystem"}, "threat_synthesis": {"affected_systems": "The flaw affects the Linux kernel across all releases that implement the netfilter BPF component and the nfnetlink_hooks interface. No specific kernel versions are listed, so any current kernel may be impacted.", "description_and_impact": "A race condition (CWE\u2011364) and use\u2011after\u2011free bug (CWE\u2011416) exist in the Linux kernel\u2019s netfilter BPF subsystem. When a process with access to the nfnetlink_hooks interface dumps hooks concurrently, the kernel releases hook memory before RCU readers have finished. This race leads to a use\u2011after\u2011free in the hook memory, causing kernel memory corruption that could potentially be leveraged for arbitrary code execution.", "risk_and_exploitability": "The CVSS score of 7.8 indicates high severity, and the EPSS score of less than 1% still suggests a low likelihood of exploitation. The vulnerability is not in the CISA KEV catalog. Based on the description, it is inferred that exploitation would require a local user with sufficient privileges to invoke nfnetlink_hooks, making the attack vector local."}}}}, "created": "2026-04-02T20:12:51.905595+00:00", "updated": "2026-04-28T17:00:13.428865+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}