{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-72351", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.921Z", "datePublished": "2026-08-15T05:55:54.150Z", "dateUpdated": "2026-08-17T05:43:08.849Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:43:08.849Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngue: validate REMCSUM private option length\n\nGUE private flags can indicate that remote checksum offload metadata is\npresent. The private flags field itself is accounted for by\nguehdr_flags_len(), but guehdr_priv_flags_len() currently returns 0 even\nwhen GUE_PFLAG_REMCSUM is set.\n\nThis lets a packet with only the private flags field pass\nvalidate_gue_flags(), after which gue_remcsum() and gue_gro_remcsum()\nread the missing REMCSUM start/offset fields from the following bytes.\n\nAccount for GUE_PLEN_REMCSUM when GUE_PFLAG_REMCSUM is present so that\nmalformed packets are rejected during option validation."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - Malformed GUE-over-UDP packets reach gue_udp_recv() and gue_gro_receive() through the normal IP/UDP receive path on hosts with FOU/GUE listeners, including internet-facing cloud overlay endpoints.\nAC:L - An attacker fully controls the crafted packet and can set GUE_PFLAG_REMCSUM with only the private-flags option present, reliably triggering gue_remcsum()/gue_gro_remcsum() without races or special timing.\nPR:N - Exploitation requires only sending UDP to a GUE listener port; no target credentials or local privileges are needed by the remote attacker even though tunnel setup itself requires admin configuration.\nUI:N - No victim interaction is required beyond the host already receiving GUE tunnel traffic as part of normal overlay networking operation.\nS:U - The flaw corrupts kernel packet buffers during GUE receive processing on the target host and does not inherently cross VM, container, or IOMMU security boundaries.\nC:H - Missing REMCSUM length validation lets attacker-controlled start/offset drive remcsum_adjust()/csum_partial() to read beyond the declared GUE options into adjacent skb bytes, enabling memory disclosure primitives.\nI:H - remcsum_adjust() performs an out-of-bounds 2-byte write at ptr+offset, and the default partial-checksum path stores attacker-controlled csum_start/csum_offset metadata that can corrupt subsequent checksum offload handling.\nA:H - Out-of-bounds REMCSUM processing can trigger kernel oops or panic from invalid memory access or corrupted packet state, causing denial of service on overlay endpoints under repeated attack."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/net/gue.h"], "versions": [{"version": "c1aa8347e73e4092411fbd96cc59531fb7e76d04", "lessThan": "158b9995d3c87f3b93f5c22df54a12e12a3438b3", "status": "affected", "versionType": "git"}, {"version": "c1aa8347e73e4092411fbd96cc59531fb7e76d04", "lessThan": "7c6876ec1b227261b51803f784c7be1b2242a1a0", "status": "affected", "versionType": "git"}, {"version": "c1aa8347e73e4092411fbd96cc59531fb7e76d04", "lessThan": "2c4de9988e9ddc760b750d6b6e701c35ff60ad14", "status": "affected", "versionType": "git"}, {"version": "c1aa8347e73e4092411fbd96cc59531fb7e76d04", "lessThan": "2a99224c120823987e4d829726f4ecb33e03fc1e", "status": "affected", "versionType": "git"}, {"version": "c1aa8347e73e4092411fbd96cc59531fb7e76d04", "lessThan": "61e78679c7c9ca685bff58e4b6348304dc60aafd", "status": "affected", "versionType": "git"}, {"version": "c1aa8347e73e4092411fbd96cc59531fb7e76d04", "lessThan": "4a4a1d41c6e901e773bcf795f562a47fa71f692a", "status": "affected", "versionType": "git"}, {"version": "c1aa8347e73e4092411fbd96cc59531fb7e76d04", "lessThan": "f618cbe9b24cd0202004d2db781d5f80ab77037f", "status": "affected", "versionType": "git"}, {"version": "c1aa8347e73e4092411fbd96cc59531fb7e76d04", "lessThan": "d335dcc6f521571d57117b8deeebc940836e5450", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/net/gue.h"], "versions": [{"version": "3.19", "status": "affected"}, {"version": "0", "lessThan": "3.19", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "3.19", "versionEndExcluding": "5.10.261"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "5.15.212"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.1.178"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.19", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": 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option length", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["include/net/gue.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "158b9995d3c87f3b93f5c22df54a12e12a3438b3", "status": "affected", "version": "c1aa8347e73e4092411fbd96cc59531fb7e76d04", "versionType": "git"}, {"lessThan": "7c6876ec1b227261b51803f784c7be1b2242a1a0", "status": "affected", "version": "c1aa8347e73e4092411fbd96cc59531fb7e76d04", "versionType": "git"}, {"lessThan": "2c4de9988e9ddc760b750d6b6e701c35ff60ad14", "status": "affected", "version": "c1aa8347e73e4092411fbd96cc59531fb7e76d04", "versionType": "git"}, {"lessThan": "2a99224c120823987e4d829726f4ecb33e03fc1e", "status": "affected", "version": "c1aa8347e73e4092411fbd96cc59531fb7e76d04", "versionType": "git"}, {"lessThan": "61e78679c7c9ca685bff58e4b6348304dc60aafd", "status": "affected", "version": "c1aa8347e73e4092411fbd96cc59531fb7e76d04", "versionType": "git"}, {"lessThan": "4a4a1d41c6e901e773bcf795f562a47fa71f692a", "status": "affected", "version": "c1aa8347e73e4092411fbd96cc59531fb7e76d04", "versionType": "git"}, {"lessThan": "f618cbe9b24cd0202004d2db781d5f80ab77037f", "status": "affected", "version": "c1aa8347e73e4092411fbd96cc59531fb7e76d04", "versionType": "git"}, {"lessThan": "d335dcc6f521571d57117b8deeebc940836e5450", "status": "affected", "version": "c1aa8347e73e4092411fbd96cc59531fb7e76d04", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["include/net/gue.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "3.19"}, {"lessThan": "3.19", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.261", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.212", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.178", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.145", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.97", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "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\ngue: validate REMCSUM private option length\n\nGUE private flags can indicate that remote checksum offload metadata is\npresent. The private flags field itself is accounted for by\nguehdr_flags_len(), but guehdr_priv_flags_len() currently returns 0 even\nwhen GUE_PFLAG_REMCSUM is set.\n\nThis lets a packet with only the private flags field pass\nvalidate_gue_flags(), after which gue_remcsum() and gue_gro_remcsum()\nread the missing REMCSUM start/offset fields from the following bytes.\n\nAccount for GUE_PLEN_REMCSUM when GUE_PFLAG_REMCSUM is present so that\nmalformed packets are rejected during option validation."}], "id": "CVE-2026-72351", "lastModified": "2026-08-17T06:18:39.157", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-15T06:22:08.520", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/158b9995d3c87f3b93f5c22df54a12e12a3438b3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2a99224c120823987e4d829726f4ecb33e03fc1e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2c4de9988e9ddc760b750d6b6e701c35ff60ad14"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4a4a1d41c6e901e773bcf795f562a47fa71f692a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/61e78679c7c9ca685bff58e4b6348304dc60aafd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7c6876ec1b227261b51803f784c7be1b2242a1a0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d335dcc6f521571d57117b8deeebc940836e5450"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f618cbe9b24cd0202004d2db781d5f80ab77037f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: gue: validate REMCSUM private option length", "id": "2516352", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516352"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ngue: validate REMCSUM private option length\nGUE private flags can indicate that remote checksum offload metadata is\npresent. The private flags field itself is accounted for by\nguehdr_flags_len(), but guehdr_priv_flags_len() currently returns 0 even\nwhen GUE_PFLAG_REMCSUM is set.\nThis lets a packet with only the private flags field pass\nvalidate_gue_flags(), after which gue_remcsum() and gue_gro_remcsum()\nread the missing REMCSUM start/offset fields from the following bytes.\nAccount for GUE_PLEN_REMCSUM when GUE_PFLAG_REMCSUM is present so that\nmalformed packets are rejected during option validation.", "A flaw was found in the Linux kernel's Generic UDP Encapsulation (GUE) implementation. A remote attacker could exploit a missing length validation for the remote checksum offload (REMCSUM) private option. By sending a specially crafted GUE packet, an attacker can cause the kernel to read beyond the intended buffer, potentially leading to information disclosure or a denial of service (DoS)."], "name": "CVE-2026-72351", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "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": "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": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-72351\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-72351\nhttps://lore.kernel.org/linux-cve-announce/2026081512-CVE-2026-72351-b6c6@gregkh/T"], "threat_severity": "Moderate"}