CVE-2026-45844

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However,\nIPv4-over-IEEE1394 ARP (RFC 2734) omits the target hardware address\nfield, and arp_hdr_len() already accounts for this by returning a\nshorter length for ARPHRD_IEEE1394 devices.\n\nAs a result, on IEEE1394 interfaces arp_packet_match() advances past a\nnonexistent target hardware address and reads the wrong bytes for both\nthe target device address comparison and the target IP address. This\ncauses arptables rules to match against garbage data, leading to\nincorrect filtering decisions: packets that should be accepted may be\ndropped and vice versa.\n\nThe ARP stack in net/ipv4/arp.c (arp_create and arp_process) already\nhandles this correctly by skipping the target hardware address for\nARPHRD_IEEE1394. Apply the same pattern to arp_packet_match().\"\n\nMangle the original patch to always return 0 (no match) in case user\nmatches on the target hardware address which is never present in\nIEEE1394.\n\nNote that this returns 0 (no match) for either normal and inverse match\nbecause matching in the target hardware address in ARPHRD_IEEE1394 has\nnever been supported by arptables. This is intentional, matching on the\ntarget hardware address should never evaluate true for ARPHRD_IEEE1394.\n\nMoreover, adjust arpt_mangle to drop the packet too as AI suggests:\n\nIn arpt_mangle, the logic assumes a standard ARP layout. Because\nIEEE1394 (FireWire) omits the target hardware address, the linear\npointer arithmetic miscalculates the offset for the target IP address.\nThis causes mangling operations to write to the wrong location, leading\nto packet corruption. To ensure safety, this patch drops packets\n(NF_DROP) when mangling is requested for these fields on IEEE1394\ndevices, as the current implementation cannot correctly map the FireWire\nARP payload.\n\nThis omits both mangling target hardware and IP address. Even if IP\naddress mangling should be possible in IEEE1394, this would require\nto adjust arpt_mangle offset calculation, which has never been\nsupported.\n\nBased on patch from Weiming Shi <bestswngs@gmail.com>."}], "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/arpt_mangle.c"], "versions": [{"version": "6752c8db8e0cfedb44ba62806dd15b383ed64000", "lessThan": "0f23a1457695f1a61f64367e39f0f9cfa29947d1", "status": "affected", "versionType": "git"}, {"version": "6752c8db8e0cfedb44ba62806dd15b383ed64000", "lessThan": "1e285362ef7096eb12733370d59e033f4a1d294a", "status": "affected", "versionType": "git"}, {"version": "6752c8db8e0cfedb44ba62806dd15b383ed64000", "lessThan": "84e8536c981338d0d8cc6e712cf71a936a93e13f", "status": "affected", "versionType": "git"}, {"version": "6752c8db8e0cfedb44ba62806dd15b383ed64000", "lessThan": "ad9973df8e0eeb123d9ec4d18828e05b7d44ff4b", "status": "affected", "versionType": "git"}, {"version": "6752c8db8e0cfedb44ba62806dd15b383ed64000", "lessThan": "03ea11dbefaa55c502735ee551c89ef773fe753b", "status": "affected", "versionType": "git"}, {"version": "6752c8db8e0cfedb44ba62806dd15b383ed64000", "lessThan": "1c55053f8ffdc060006df898fd3664e3d1bfac7b", "status": "affected", "versionType": "git"}, {"version": "6752c8db8e0cfedb44ba62806dd15b383ed64000", "lessThan": "ac698d81fd6619c7504cee913f1cab5285fba1b7", "status": "affected", "versionType": "git"}, {"version": "6752c8db8e0cfedb44ba62806dd15b383ed64000", "lessThan": "1e8e3f449b1e73b73a843257635b9c50f0cc0f0a", "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/ipv4/netfilter/arp_tables.c", 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"https://git.kernel.org/stable/c/1e8e3f449b1e73b73a843257635b9c50f0cc0f0a"}], "title": "netfilter: arp_tables: fix IEEE1394 ARP payload parsing", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"x_adpType": "supplier", "providerMetadata": {"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-10-15T01:19:48.196Z"}, "affected": [{"vendor": "Siemens", "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem", "versions": [{"status": "affected", "version": "0", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}], "references": [{"url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}]}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-45844", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-06T15:41:54.623846Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": 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However,\nIPv4-over-IEEE1394 ARP (RFC 2734) omits the target hardware address\nfield, and arp_hdr_len() already accounts for this by returning a\nshorter length for ARPHRD_IEEE1394 devices.\n\nAs a result, on IEEE1394 interfaces arp_packet_match() advances past a\nnonexistent target hardware address and reads the wrong bytes for both\nthe target device address comparison and the target IP address. This\ncauses arptables rules to match against garbage data, leading to\nincorrect filtering decisions: packets that should be accepted may be\ndropped and vice versa.\n\nThe ARP stack in net/ipv4/arp.c (arp_create and arp_process) already\nhandles this correctly by skipping the target hardware address for\nARPHRD_IEEE1394. Apply the same pattern to arp_packet_match().\"\n\nMangle the original patch to always return 0 (no match) in case user\nmatches on the target hardware address which is never present in\nIEEE1394.\n\nNote that this returns 0 (no match) for either normal and inverse match\nbecause matching in the target hardware address in ARPHRD_IEEE1394 has\nnever been supported by arptables. This is intentional, matching on the\ntarget hardware address should never evaluate true for ARPHRD_IEEE1394.\n\nMoreover, adjust arpt_mangle to drop the packet too as AI suggests:\n\nIn arpt_mangle, the logic assumes a standard ARP layout. Because\nIEEE1394 (FireWire) omits the target hardware address, the linear\npointer arithmetic miscalculates the offset for the target IP address.\nThis causes mangling operations to write to the wrong location, leading\nto packet corruption. To ensure safety, this patch drops packets\n(NF_DROP) when mangling is requested for these fields on IEEE1394\ndevices, as the current implementation cannot correctly map the FireWire\nARP payload.\n\nThis omits both mangling target hardware and IP address. Even if IP\naddress mangling should be possible in IEEE1394, this would require\nto adjust arpt_mangle offset calculation, which has never been\nsupported.\n\nBased on patch from Weiming Shi <bestswngs@gmail.com>."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.258", "versionStartIncluding": "3.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.209", "versionStartIncluding": "3.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.175", "versionStartIncluding": "3.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.141", "versionStartIncluding": "3.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.91", "versionStartIncluding": "3.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.33", "versionStartIncluding": "3.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0.10", "versionStartIncluding": "3.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1", "versionStartIncluding": "3.10"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-06-14T17:46:23.877Z"}}}, "cveMetadata": {"cveId": "CVE-2026-45844", "state": "PUBLISHED", "dateUpdated": "2026-11-06T15:42:59.243Z", "dateReserved": "2026-05-13T15:03:33.078Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-05-27T09:24:47.041Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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However,\nIPv4-over-IEEE1394 ARP (RFC 2734) omits the target hardware address\nfield, and arp_hdr_len() already accounts for this by returning a\nshorter length for ARPHRD_IEEE1394 devices.\n\nAs a result, on IEEE1394 interfaces arp_packet_match() advances past a\nnonexistent target hardware address and reads the wrong bytes for both\nthe target device address comparison and the target IP address. This\ncauses arptables rules to match against garbage data, leading to\nincorrect filtering decisions: packets that should be accepted may be\ndropped and vice versa.\n\nThe ARP stack in net/ipv4/arp.c (arp_create and arp_process) already\nhandles this correctly by skipping the target hardware address for\nARPHRD_IEEE1394. Apply the same pattern to arp_packet_match().\"\n\nMangle the original patch to always return 0 (no match) in case user\nmatches on the target hardware address which is never present in\nIEEE1394.\n\nNote that this returns 0 (no match) for either normal and inverse match\nbecause matching in the target hardware address in ARPHRD_IEEE1394 has\nnever been supported by arptables. This is intentional, matching on the\ntarget hardware address should never evaluate true for ARPHRD_IEEE1394.\n\nMoreover, adjust arpt_mangle to drop the packet too as AI suggests:\n\nIn arpt_mangle, the logic assumes a standard ARP layout. Because\nIEEE1394 (FireWire) omits the target hardware address, the linear\npointer arithmetic miscalculates the offset for the target IP address.\nThis causes mangling operations to write to the wrong location, leading\nto packet corruption. To ensure safety, this patch drops packets\n(NF_DROP) when mangling is requested for these fields on IEEE1394\ndevices, as the current implementation cannot correctly map the FireWire\nARP payload.\n\nThis omits both mangling target hardware and IP address. Even if IP\naddress mangling should be possible in IEEE1394, this would require\nto adjust arpt_mangle offset calculation, which has never been\nsupported.\n\nBased on patch from Weiming Shi <bestswngs@gmail.com>."}], "id": "CVE-2026-45844", "lastModified": "2026-11-06T16:18:46.510", "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-2026-45844", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T15:41:54.623846Z", "version": "2.0.3"}}]}, "published": "2026-05-27T11:16:23.847", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/03ea11dbefaa55c502735ee551c89ef773fe753b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0f23a1457695f1a61f64367e39f0f9cfa29947d1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1c55053f8ffdc060006df898fd3664e3d1bfac7b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1e285362ef7096eb12733370d59e033f4a1d294a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1e8e3f449b1e73b73a843257635b9c50f0cc0f0a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/84e8536c981338d0d8cc6e712cf71a936a93e13f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ac698d81fd6619c7504cee913f1cab5285fba1b7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ad9973df8e0eeb123d9ec4d18828e05b7d44ff4b"}, {"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: arp_tables: fix IEEE1394 ARP payload parsing", "id": "2481864", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2481864"}, "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-125", "details": ["A flaw was found in the Linux kernel's netfilter ARP (Address Resolution Protocol) tables. When processing IPv4-over-IEEE1394 ARP packets on IEEE1394 interfaces, the kernel incorrectly parses the ARP payload. This can lead to incorrect filtering decisions by arptables, where packets that should be accepted may be dropped, and vice versa, resulting in a Denial of Service (DoS). Furthermore, attempts to mangle target hardware or IP addresses in IEEE1394 ARP packets can cause packet corruption, also leading to a Denial of Service."], "name": "CVE-2026-45844", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "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": "2026-05-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-45844\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-45844\nhttps://lore.kernel.org/linux-cve-announce/2026052713-CVE-2026-45844-703b@gregkh/T"], "threat_severity": "Moderate"}

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