{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-74735",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-08-15T05:44:03.930Z",
        "datePublished": "2026-08-26T14:36:49.352Z",
        "dateUpdated": "2026-08-26T14:36:49.352Z"
    },
    "containers": {
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            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-26T14:36:49.352Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nl2tp: fix tunnel and session refcount leak on seq_file release\n\nIn pppol2tp_proc_open() and l2tp_dfs_seq_open(), iteration state\n(pd->tunnel and pd->session) is kept in seq_file private data to allow\niteration across multiple read() system calls.\n\nHowever, if userspace closes /proc/net/pppol2tp or /sys/kernel/debug/l2tp/tunnels\nbefore reading to end-of-file (EOF), any tunnel or session reference stored in\npd->tunnel / pd->session is left un-dropped when seq_file private data is freed.\n\nFix this by dropping any remaining pd->tunnel and pd->session references in\npppol2tp_proc_release() and l2tp_dfs_seq_release() when closing the file."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/l2tp/l2tp_debugfs.c",
                        "net/l2tp/l2tp_ppp.c"
                    ],
                    "versions": [
                        {
                            "version": "0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443",
                            "lessThan": "ebe2774e956482dd3c70b8991f6f7654356339e6",
                            "status": "affected",
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                            "version": "0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443",
                            "lessThan": "9006c116dd111d457bf5d074990210f70a4ad2c8",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
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                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "7f8e401f9e612df2a95c1ef76217c00181389bb5",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c712ed63e9b33d9a282fbd92ce25c64918c3129f",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "9a8863e8a8def9d88583cd9c60db38a008e6b8cf",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "3.16.60",
                            "lessThan": "3.17",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "4.16.6",
                            "lessThan": "4.17",
                            "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/l2tp/l2tp_debugfs.c",
                        "net/l2tp/l2tp_ppp.c"
                    ],
                    "versions": [
                        {
                            "version": "4.17",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "4.17",
                            "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"
                        }
                    ]
                }
            ],
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                    "nodes": [
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                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
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                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.17",
                                    "versionEndExcluding": "7.1.10"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.17",
                                    "versionEndExcluding": "7.2"
                                },
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                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.16.60"
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                                    "versionStartIncluding": "4.16.6"
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                                    "versionStartIncluding": "3.16.60"
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            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/ebe2774e956482dd3c70b8991f6f7654356339e6"
                },
                {
                    "url": "https://git.kernel.org/stable/c/9006c116dd111d457bf5d074990210f70a4ad2c8"
                }
            ],
            "title": "l2tp: fix tunnel and session refcount leak on seq_file release",
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}