{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-98621",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-09-25T10:25:14.360Z",
        "datePublished": "2026-10-18T15:19:41.211Z",
        "dateUpdated": "2026-10-19T09:22:49.371Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-10-19T09:22:49.371Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: gue: reject invalid REMCSUM offsets\n\nThe REMCSUM option carries an absolute checksum start and checksum field\noffset. gue_remcsum() passes them to skb_remcsum_process(), whose\npartial path stores offset - start in the u16 skb->csum_offset variable.\nIf offset is less than start, this underflows.\n\nA forwarded packet can retain CHECKSUM_PARTIAL and reach a NETIF_F_HW_CSUM\ndriver which trusts the metadata, leading skb_copy_and_csum_dev() to write\ntwo bytes about 64 KiB beyond the destination buffer.\n\nReject reversed tuples in validate_gue_flags(), after the existing length\nvalidation, so all GUE parsers enforce the ordering in one place."
                }
            ],
            "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": "fe881ef11cf0220f118816181930494d484c4883",
                            "lessThan": "4b9bc21b2396c396d88dd909caaf73d5be6ff593",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "fe881ef11cf0220f118816181930494d484c4883",
                            "lessThan": "43efb1f997e976f386aa89716f55870cd2cff9ad",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "fe881ef11cf0220f118816181930494d484c4883",
                            "lessThan": "1eeec0c51fd5598da44080ed96bbd9880021c28b",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "fe881ef11cf0220f118816181930494d484c4883",
                            "lessThan": "1d664be4ca49d1696e85239236f4988dfc4653c3",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "fe881ef11cf0220f118816181930494d484c4883",
                            "lessThan": "97f907203321eee2cc9132d5c9eb47698fb41d35",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "fe881ef11cf0220f118816181930494d484c4883",
                            "lessThan": "40aeafbcbc7bc4018e8f74bbbb4d29ed8846f57f",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "fe881ef11cf0220f118816181930494d484c4883",
                            "lessThan": "c20f755338ca234e523dfc943719f194dfc1f903",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "fe881ef11cf0220f118816181930494d484c4883",
                            "lessThan": "2566866fc30965d915d0b52b5c3323b362619f0e",
                            "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": "4.0",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "4.0",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.271",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.222",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.189",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.158",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.112",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.55",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.9",
                            "lessThanOrEqual": "7.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.3",
                            "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": "4.0",
                                    "versionEndExcluding": "5.10.271"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.0",
                                    "versionEndExcluding": "5.15.222"
                                },
                                {
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                                    "versionStartIncluding": "4.0",
                                    "versionEndExcluding": "6.1.189"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.0",
                                    "versionEndExcluding": "6.6.158"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.0",
                                    "versionEndExcluding": "6.12.112"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.0",
                                    "versionEndExcluding": "6.18.55"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.0",
                                    "versionEndExcluding": "7.2.9"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.0",
                                    "versionEndExcluding": "7.3"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/4b9bc21b2396c396d88dd909caaf73d5be6ff593"
                },
                {
                    "url": "https://git.kernel.org/stable/c/43efb1f997e976f386aa89716f55870cd2cff9ad"
                },
                {
                    "url": "https://git.kernel.org/stable/c/1eeec0c51fd5598da44080ed96bbd9880021c28b"
                },
                {
                    "url": "https://git.kernel.org/stable/c/1d664be4ca49d1696e85239236f4988dfc4653c3"
                },
                {
                    "url": "https://git.kernel.org/stable/c/97f907203321eee2cc9132d5c9eb47698fb41d35"
                },
                {
                    "url": "https://git.kernel.org/stable/c/40aeafbcbc7bc4018e8f74bbbb4d29ed8846f57f"
                },
                {
                    "url": "https://git.kernel.org/stable/c/c20f755338ca234e523dfc943719f194dfc1f903"
                },
                {
                    "url": "https://git.kernel.org/stable/c/2566866fc30965d915d0b52b5c3323b362619f0e"
                }
            ],
            "title": "net: gue: reject invalid REMCSUM offsets",
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    }
}