{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-80784",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-08-26T14:34:25.792Z",
        "datePublished": "2026-09-04T15:12:56.125Z",
        "dateUpdated": "2026-09-04T15:12:56.125Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-09-04T15:12:56.125Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: pm: fix memory leak from alloc-during-teardown race\n\nmptcp_pm_destroy() empties msk->pm.anno_list and\nmsk->pm.userspace_pm_local_addr_list under msk->pm.lock during socket\nteardown, dropping the lock between the two.\n\nA concurrent userspace PM genl ANNOUNCE on the same msk holds a sock\nreference via mptcp_token_get_sock() and, in\nmptcp_pm_nl_announce_doit(), calls\nmptcp_userspace_pm_append_new_local_addr() and\nmptcp_pm_announced_alloc(). Both take msk->pm.lock briefly to add to\ntheir respective lists. Because the genl handler holds a sock reference,\nmptcp_pm_destroy() may run on the same msk via mptcp_disconnect(), which\ninvokes mptcp_destroy_common() without dropping the sock refcount,\nbefore the handler completes.\n\nIf the lock acquisitions interleave such that mptcp_pm_destroy() empties\na list first, the later alloc adds its entry to a list head that nothing\nelse iterates for this msk, and the entry leaks. kmemleak reports both\nmptcp_pm_add_addr objects (from mptcp_pm_announced_alloc()) and\nmptcp_pm_addr_entry objects (from\nmptcp_userspace_pm_append_new_local_addr()) under sustained concurrent\nANNOUNCE + close load against the userspace PM.\n\nAdd an MPTCP_PM_DESTROYING bit in msk->pm.status, set by\nmptcp_pm_destroy() under pm.lock before the lists are emptied and\nchecked under pm.lock by the alloc paths. Either the alloc takes pm.lock\nfirst, in which case its entry is on the list when mptcp_pm_destroy()\nfrees it; or mptcp_pm_destroy() takes pm.lock first, in which case the\nlater alloc observes the bit and refuses.\n\nFound by an MPTCP protocol-flow harness extending BRF (arXiv:2305.08782)."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/mptcp/pm.c",
                        "net/mptcp/pm_userspace.c",
                        "net/mptcp/protocol.h"
                    ],
                    "versions": [
                        {
                            "version": "9ab4807c84a4aacfc9b4f79cc81254035e0ec361",
                            "lessThan": "f48341830e4202db3fe884b819b2db6740f0537d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "9ab4807c84a4aacfc9b4f79cc81254035e0ec361",
                            "lessThan": "bb32e9a6a9a9f99eeda16c4efe443400f3e43892",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "9ab4807c84a4aacfc9b4f79cc81254035e0ec361",
                            "lessThan": "b2a0b55bf613bd3e81ed26a847b0f6b8e6b7f804",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "9ab4807c84a4aacfc9b4f79cc81254035e0ec361",
                            "lessThan": "9fe5eebb664ecdba88f3fde18062d94b1d1c465f",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "9ab4807c84a4aacfc9b4f79cc81254035e0ec361",
                            "lessThan": "6c290915a03fc8228b473641025cf762b256dbd2",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "9ab4807c84a4aacfc9b4f79cc81254035e0ec361",
                            "lessThan": "efc33b5102ff859bacd390a5f30112d8e0c084c0",
                            "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/mptcp/pm.c",
                        "net/mptcp/pm_userspace.c",
                        "net/mptcp/protocol.h"
                    ],
                    "versions": [
                        {
                            "version": "5.19",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.19",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.187",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.154",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.106",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.47",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.11",
                            "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": "5.19",
                                    "versionEndExcluding": "6.1.187"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.19",
                                    "versionEndExcluding": "6.6.154"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.19",
                                    "versionEndExcluding": "6.12.106"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.19",
                                    "versionEndExcluding": "6.18.47"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.19",
                                    "versionEndExcluding": "7.1.11"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.19",
                                    "versionEndExcluding": "7.2"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/f48341830e4202db3fe884b819b2db6740f0537d"
                },
                {
                    "url": "https://git.kernel.org/stable/c/bb32e9a6a9a9f99eeda16c4efe443400f3e43892"
                },
                {
                    "url": "https://git.kernel.org/stable/c/b2a0b55bf613bd3e81ed26a847b0f6b8e6b7f804"
                },
                {
                    "url": "https://git.kernel.org/stable/c/9fe5eebb664ecdba88f3fde18062d94b1d1c465f"
                },
                {
                    "url": "https://git.kernel.org/stable/c/6c290915a03fc8228b473641025cf762b256dbd2"
                },
                {
                    "url": "https://git.kernel.org/stable/c/efc33b5102ff859bacd390a5f30112d8e0c084c0"
                }
            ],
            "title": "mptcp: pm: fix memory leak from alloc-during-teardown race",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}