{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-98984",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-09-25T10:25:14.384Z",
        "datePublished": "2026-10-23T12:20:02.285Z",
        "dateUpdated": "2026-10-23T12:20:02.285Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-10-23T12:20:02.285Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndcache: don't put a mountpoint on a dentry that's being removed\n\nrmdir(), unlink() and rename() call dont_mount() on the victim and then\ndetach_mounts() with the victim's inode locked. do_lock_mount() takes\nthe inode lock of the mountpoint and checks cant_mount() so a mount\ncan't show up after detach_mounts().\n\nBut attach_recursive_mnt() makes a second mountpoint for the root of the\nsource mount so that the mounts already located at the destination can\nbe put on top of it. No inode is locked for that one and d_set_mounted()\nonly refuses a dentry that is unlinked. Between detach_mounts() and\nd_delete() the victim is still hashed:\n\n  rmrace: b passed dont_mount() and detach_mounts(), sleeping\n  T2: move_mount(S, /tmp/plcant/x, BENEATH) = 0 errno 0 ()\n  T1: rmdir(/tmp/plcant/d/b) = 0 errno 0\n      109 107 0:61 /d/b//deleted /tmp/plcant/x rw,relatime - tmpfs tmpfs rw\n      108 109 0:63 / /tmp/plcant/x rw,relatime - tmpfs T rw\n\nA bind mount of the directory that's being removed is moved beneath an\nexisting mount while the rmdir() is located between the two calls. The\nmount ends up on the removed directory and nothing will ever detach it.\n\nCheck cant_mount() in d_set_mounted() as well. dont_mount() raises the\nflag under d_lock before detach_mounts() runs so either the mountpoint\nis set first and detach_mounts() finds the mount or the flag is seen and\nthe mount is refused."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/dcache.c"
                    ],
                    "versions": [
                        {
                            "version": "1064f874abc0d05eeed8993815f584d847b72486",
                            "lessThan": "5e6bfd9f249f2c74bb63c0f06ad959da3bee0971",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "1064f874abc0d05eeed8993815f584d847b72486",
                            "lessThan": "793cb67b0f52d00c67bd0e76bc57455b5c70ebb8",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "1064f874abc0d05eeed8993815f584d847b72486",
                            "lessThan": "390ddcea2a8aca411b931a8e2863a80ccca8d2b3",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "1064f874abc0d05eeed8993815f584d847b72486",
                            "lessThan": "30a1625022411a387cce9239408ece9955bc9c58",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "1064f874abc0d05eeed8993815f584d847b72486",
                            "lessThan": "75f4197f1e11d2eb75c2d6f916a7d4764db621e5",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5e6ef5ef6eaf690faad3a7c6c665ebf45d7b6ccf",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "839d42687dfce0ed0ea2c6bd8d707cc0e276fbe7",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "808e83e5add13152bd4a88346487de68395c136b",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "6de9d08a9718ee9c12ba6343c50141c2d633e3dc",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "4.1.40",
                            "lessThan": "4.2",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "4.4.54",
                            "lessThan": "4.5",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "4.9.15",
                            "lessThan": "4.10",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "4.10.3",
                            "lessThan": "4.11",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/dcache.c"
                    ],
                    "versions": [
                        {
                            "version": "4.11",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "4.11",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.160",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.113",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.57",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.11",
                            "lessThanOrEqual": "7.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.3",
                            "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": "4.11",
                                    "versionEndExcluding": "6.6.160"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.11",
                                    "versionEndExcluding": "6.12.113"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.11",
                                    "versionEndExcluding": "6.18.57"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.11",
                                    "versionEndExcluding": "7.2.11"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.11",
                                    "versionEndExcluding": "7.3"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.1.40"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.4.54"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.9.15"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.10.3"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/5e6bfd9f249f2c74bb63c0f06ad959da3bee0971"
                },
                {
                    "url": "https://git.kernel.org/stable/c/793cb67b0f52d00c67bd0e76bc57455b5c70ebb8"
                },
                {
                    "url": "https://git.kernel.org/stable/c/390ddcea2a8aca411b931a8e2863a80ccca8d2b3"
                },
                {
                    "url": "https://git.kernel.org/stable/c/30a1625022411a387cce9239408ece9955bc9c58"
                },
                {
                    "url": "https://git.kernel.org/stable/c/75f4197f1e11d2eb75c2d6f916a7d4764db621e5"
                }
            ],
            "title": "dcache: don't put a mountpoint on a dentry that's being removed",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}