{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-74740",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-08-15T05:44:03.930Z",
        "datePublished": "2026-08-26T14:36:52.344Z",
        "dateUpdated": "2026-08-26T14:36:52.344Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-26T14:36:52.344Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: act_api: fix TOCTOU NULL deref on a->goto_chain\n\ntcf_action_exec() handles TC_ACT_GOTO_CHAIN by first checking\nrcu_access_pointer(a->goto_chain) and then calling\ntcf_action_goto_chain_exec(), which does a second, independent\nrcu_dereference_bh(a->goto_chain) read and immediately dereferences\nchain->filter_chain. A concurrent tcf_action_set_ctrlact() (e.g. the gact\nreplace path) can clear a->goto_chain between the two reads, so the second\nread returns NULL and tcf_action_goto_chain_exec() dereferences NULL.\n\nFix the race by doing a single rcu_dereference_bh() read of a->goto_chain\nin tcf_action_exec(), checking it once for NULL, and passing the resulting\nchain pointer into tcf_action_goto_chain_exec(). This turns the split\ncheck/use into a single check/use on one value."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/sched/act_api.c"
                    ],
                    "versions": [
                        {
                            "version": "ee3bbfe806cdb46b02cda63626cb50a7a7b19fc5",
                            "lessThan": "91d55fd1fdb85c8371ca8793c788ea7d5192383a",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ee3bbfe806cdb46b02cda63626cb50a7a7b19fc5",
                            "lessThan": "1ec48b6715c29b20105e3485206602cff6c51ae5",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ee3bbfe806cdb46b02cda63626cb50a7a7b19fc5",
                            "lessThan": "abceabc4408fca6a9dd52611f5d197dec9390d63",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ee3bbfe806cdb46b02cda63626cb50a7a7b19fc5",
                            "lessThan": "6b70886ebc428eed43a069c8944a931b5fb3f4e4",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ee3bbfe806cdb46b02cda63626cb50a7a7b19fc5",
                            "lessThan": "f60b396ee174206fe08ebf997d16cd3801b77b22",
                            "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/sched/act_api.c"
                    ],
                    "versions": [
                        {
                            "version": "5.1",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.1",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.153",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.105",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.46",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.10",
                            "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": "5.1",
                                    "versionEndExcluding": "6.6.153"
                                },
                                {
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                                    "versionStartIncluding": "5.1",
                                    "versionEndExcluding": "7.2"
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            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/91d55fd1fdb85c8371ca8793c788ea7d5192383a"
                },
                {
                    "url": "https://git.kernel.org/stable/c/1ec48b6715c29b20105e3485206602cff6c51ae5"
                },
                {
                    "url": "https://git.kernel.org/stable/c/abceabc4408fca6a9dd52611f5d197dec9390d63"
                },
                {
                    "url": "https://git.kernel.org/stable/c/6b70886ebc428eed43a069c8944a931b5fb3f4e4"
                },
                {
                    "url": "https://git.kernel.org/stable/c/f60b396ee174206fe08ebf997d16cd3801b77b22"
                }
            ],
            "title": "net/sched: act_api: fix TOCTOU NULL deref on a->goto_chain",
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}