{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-31684",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-03-09T15:48:24.130Z",
        "datePublished": "2026-04-25T08:47:01.555Z",
        "dateUpdated": "2026-06-01T16:13:24.352Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-06-01T16:13:24.352Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: sched: act_csum: validate nested VLAN headers\n\ntcf_csum_act() walks nested VLAN headers directly from skb->data when an\nskb still carries in-payload VLAN tags. The current code reads\nvlan->h_vlan_encapsulated_proto and then pulls VLAN_HLEN bytes without\nfirst ensuring that the full VLAN header is present in the linear area.\n\nIf only part of an inner VLAN header is linearized, accessing\nh_vlan_encapsulated_proto reads past the linear area, and the following\nskb_pull(VLAN_HLEN) may violate skb invariants.\n\nFix this by requiring pskb_may_pull(skb, VLAN_HLEN) before accessing and\npulling each nested VLAN header. If the header still is not fully\navailable, drop the packet through the existing error path."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/sched/act_csum.c"
                    ],
                    "versions": [
                        {
                            "version": "2ecba2d1e45b24620a7c3df9531895cf68d5dec6",
                            "lessThan": "0410c619e86551677fb79887a38eccad3f5a0725",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "2ecba2d1e45b24620a7c3df9531895cf68d5dec6",
                            "lessThan": "886469b6455611a511aa6013e957e15e50577513",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "2ecba2d1e45b24620a7c3df9531895cf68d5dec6",
                            "lessThan": "46c07ad50fa2f4ba7663ee1b72b75ad7ad45cf09",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "2ecba2d1e45b24620a7c3df9531895cf68d5dec6",
                            "lessThan": "eb3765b90eb8f2a3d6310a80c14a9e57ec4267a2",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "2ecba2d1e45b24620a7c3df9531895cf68d5dec6",
                            "lessThan": "a69738efea0996d05a3c7d2178551b891744df1b",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "2ecba2d1e45b24620a7c3df9531895cf68d5dec6",
                            "lessThan": "ec4930979b3f7bbeb7af5744599fc6603a4dba62",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "2ecba2d1e45b24620a7c3df9531895cf68d5dec6",
                            "lessThan": "3d165d975305cf76ff0b10a3c798fb31e5f5f9a5",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "2ecba2d1e45b24620a7c3df9531895cf68d5dec6",
                            "lessThan": "c842743d073bdd683606cb414eb0ca84465dd834",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "3764bfae5056e95617b6ee074129297e11710886",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "4.19.99",
                            "lessThan": "4.20",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/sched/act_csum.c"
                    ],
                    "versions": [
                        {
                            "version": "5.1",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.1",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.258",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.209",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.175",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.136",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.83",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.24",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.19.14",
                            "lessThanOrEqual": "6.19.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0",
                            "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:*:*:*:*:*:*:*:*",
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                                    "versionEndExcluding": "5.10.258"
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                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.1",
                                    "versionEndExcluding": "5.15.209"
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            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/0410c619e86551677fb79887a38eccad3f5a0725"
                },
                {
                    "url": "https://git.kernel.org/stable/c/886469b6455611a511aa6013e957e15e50577513"
                },
                {
                    "url": "https://git.kernel.org/stable/c/46c07ad50fa2f4ba7663ee1b72b75ad7ad45cf09"
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                {
                    "url": "https://git.kernel.org/stable/c/eb3765b90eb8f2a3d6310a80c14a9e57ec4267a2"
                },
                {
                    "url": "https://git.kernel.org/stable/c/a69738efea0996d05a3c7d2178551b891744df1b"
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                    "url": "https://git.kernel.org/stable/c/ec4930979b3f7bbeb7af5744599fc6603a4dba62"
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                {
                    "url": "https://git.kernel.org/stable/c/3d165d975305cf76ff0b10a3c798fb31e5f5f9a5"
                },
                {
                    "url": "https://git.kernel.org/stable/c/c842743d073bdd683606cb414eb0ca84465dd834"
                }
            ],
            "title": "net: sched: act_csum: validate nested VLAN headers",
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}