CVE-2026-53219

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A caller can provide a userspace\nbuffer that faults during the initial fixed-header copy after pcnt has\nbeen copied but before the later sanitized counter copy runs. The syscall\nthen returns -EFAULT while leaving the raw percpu pointer in userspace.\n\nCopy only the fixed entry prefix before counters from the kernelized rule\nblob, then copy the sanitized counter snapshot into the counter field.\nApply this ordering to the IPv4, IPv6, and ARP native and compat\nget-entries implementations so a fault cannot expose the internal percpu\ncounter pointer."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv4/netfilter/arp_tables.c", "net/ipv4/netfilter/ip_tables.c", "net/ipv6/netfilter/ip6_tables.c"], "versions": [{"version": "71ae0dff02d756e4d2ca710b79f2ff5390029a5f", "lessThan": "b74ba3343eb44b2cbf7e9665918c287df1d52ebb", "status": "affected", "versionType": "git"}, {"version": "71ae0dff02d756e4d2ca710b79f2ff5390029a5f", "lessThan": "0b35dc8527ccc16b7dc34e8a3164313e68cd4e45", "status": "affected", "versionType": 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A caller can provide a userspace\nbuffer that faults during the initial fixed-header copy after pcnt has\nbeen copied but before the later sanitized counter copy runs. The syscall\nthen returns -EFAULT while leaving the raw percpu pointer in userspace.\n\nCopy only the fixed entry prefix before counters from the kernelized rule\nblob, then copy the sanitized counter snapshot into the counter field.\nApply this ordering to the IPv4, IPv6, and ARP native and compat\nget-entries implementations so a fault cannot expose the internal percpu\ncounter pointer."}], "id": "CVE-2026-53219", "lastModified": "2026-11-10T13:19:23.930", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-53219", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T16:22:34.867317Z", "version": "2.0.3"}}]}, "published": "2026-06-25T09:16:39.613", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/08a3e218064db11f154ad9ad5541751ea7f34ebe"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0b35dc8527ccc16b7dc34e8a3164313e68cd4e45"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8d67e42ad3b1a95a152541015a07110e06992d6c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a0d16941adf3a501956d74aefd8d6e217906e79c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b28e2fcad3db7e8687b15bc20bced26b5b7c920e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b74ba3343eb44b2cbf7e9665918c287df1d52ebb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f7f2fbb0e893a0238dc464f8d8c0f5609bec584f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fb0521aff1e10e300d89725cc439d3ea74c828c5"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: netfilter: x_tables: avoid leaking percpu counter pointers", "id": "2492757", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492757"}, "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-1098", "details": ["A flaw was found in the Linux kernel's netfilter x_tables component. This vulnerability allows for information disclosure due to improper handling of percpu counter pointers during the copying of rule entry headers to userspace. A local attacker could exploit this by causing a fault in a userspace buffer, leading to the exposure of internal kernel memory addresses."], "name": "CVE-2026-53219", "public_date": "2026-06-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53219\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53219\nhttps://lore.kernel.org/linux-cve-announce/2026062505-CVE-2026-53219-1af4@gregkh/T"], "threat_severity": "Moderate"}

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