{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-74692",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-08-15T05:44:03.926Z",
        "datePublished": "2026-08-22T15:32:55.873Z",
        "dateUpdated": "2026-08-22T15:32:55.873Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-22T15:32:55.873Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix TOCTOU race between smc_listen_out() and listener close\n\nsmc_listen_out() reads lsmc->sk.sk_state without the listener lock,\nthen acquires lock_sock_nested() only after the check passes. This\nopens a window where smc_close_active() can transition the listener\nto SMC_CLOSED, call smc_close_cleanup_listen() to drain the accept\nqueue, and release the lock, all between the lockless read and the\ndelayed lock acquisition:\n\n  smc_listen_work (smc_hs_wq)          smc_close_active()\n  -------------------------------      -------------------------\n  release_sock(child)\n  if (sk_state == SMC_LISTEN) TRUE\n                                        lock_sock(listener)\n                                        sk_state = SMC_CLOSED\n                                        smc_close_cleanup_listen()\n                                        release_sock(listener)\n                                        flush_work(tcp_listen_work)\n  lock_sock_nested(listener)\n  smc_accept_enqueue(listener, child) /* child enqueued on dead listener */\n\nsmc_close_active() flushes only tcp_listen_work. Work items already\ndispatched onto smc_hs_wq for the CLC handshake continue running\nunguarded. smc_accept_enqueue() takes a sock_hold() on the child that\nis never released, so the child smc_sock, its clcsock, and the\nreference all leak. A remote peer that opens TCP connections while the\nserver calls close() can exhaust kernel memory.\n\nMove lock_sock_nested() to before the sk_state check so that the test\nand the enqueue are atomic under the listener lock."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/smc/af_smc.c"
                    ],
                    "versions": [
                        {
                            "version": "fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9",
                            "lessThan": "53c7938d8bcfde3296ec1a347ba2a9393c1fdcfa",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9",
                            "lessThan": "feb71634bb1abab3e8fb5cde874b27001cc1282e",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9",
                            "lessThan": "01865e1ddb126b25ac9eba5cdd7ec49e11183a64",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9",
                            "lessThan": "00f89433777236ced4771211047fb5d4cd581cea",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9",
                            "lessThan": "78e5ebcd1c10ed7c8bda0a99e0abd5b62da86d67",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9",
                            "lessThan": "ff5bcd804b5bc5c64736b7d318c20e12ea9506b8",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9",
                            "lessThan": "185a4caeecabc150106deda1da170b09f2ad803f",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "d1d004585b40c212b338fc8a40cbaaf230ea4703",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "4.19.299",
                            "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/smc/af_smc.c"
                    ],
                    "versions": [
                        {
                            "version": "5.1",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.1",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.216",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.183",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.152",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.104",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.45",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.9",
                            "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": "5.15.216"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.1",
                                    "versionEndExcluding": "6.1.183"
                                },
                                {
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.1",
                                    "versionEndExcluding": "6.6.152"
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                                    "versionEndExcluding": "6.12.104"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.1",
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                                    "versionStartIncluding": "5.1",
                                    "versionEndExcluding": "7.1.9"
                                },
                                {
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.1",
                                    "versionEndExcluding": "7.2"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.19.299"
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                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/53c7938d8bcfde3296ec1a347ba2a9393c1fdcfa"
                },
                {
                    "url": "https://git.kernel.org/stable/c/feb71634bb1abab3e8fb5cde874b27001cc1282e"
                },
                {
                    "url": "https://git.kernel.org/stable/c/01865e1ddb126b25ac9eba5cdd7ec49e11183a64"
                },
                {
                    "url": "https://git.kernel.org/stable/c/00f89433777236ced4771211047fb5d4cd581cea"
                },
                {
                    "url": "https://git.kernel.org/stable/c/78e5ebcd1c10ed7c8bda0a99e0abd5b62da86d67"
                },
                {
                    "url": "https://git.kernel.org/stable/c/ff5bcd804b5bc5c64736b7d318c20e12ea9506b8"
                },
                {
                    "url": "https://git.kernel.org/stable/c/185a4caeecabc150106deda1da170b09f2ad803f"
                }
            ],
            "title": "net/smc: fix TOCTOU race between smc_listen_out() and listener close",
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                "engine": "bippy-1.2.0"
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    }
}