{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2025-71072",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-01-13T15:30:19.647Z",
        "datePublished": "2026-01-13T15:31:26.089Z",
        "dateUpdated": "2026-08-05T12:11:52.290Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-05T12:11:52.290Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nshmem: fix recovery on rename failures\n\nmaple_tree insertions can fail if we are seriously short on memory;\nsimple_offset_rename() does not recover well if it runs into that.\nThe same goes for simple_offset_rename_exchange().\n\nMoreover, shmem_whiteout() expects that if it succeeds, the caller will\nprogress to d_move(), i.e. that shmem_rename2() won't fail past the\nsuccessful call of shmem_whiteout().\n\nNot hard to fix, fortunately - mtree_store() can't fail if the index we\nare trying to store into is already present in the tree as a singleton.\n\nFor simple_offset_rename_exchange() that's enough - we just need to be\ncareful about the order of operations.\n\nFor simple_offset_rename() solution is to preinsert the target into the\ntree for new_dir; the rest can be done without any potentially failing\noperations.\n\nThat preinsertion has to be done in shmem_rename2() rather than in\nsimple_offset_rename() itself - otherwise we'd need to deal with the\npossibility of failure after successful shmem_whiteout()."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H",
                        "baseScore": 8.2,
                        "baseSeverity": "HIGH"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "AV:N - A remote NFS client can invoke ordinary RENAME on a writable tmpfs export through nfsd, reaching shmem_rename2() and the vulnerable offset helpers.\nAC:L - The failure requires severe memory pressure, but an attacker with write access to tmpfs can create files and consume memory while repeatedly attempting renames.\nPR:N - A reasonably configured anonymous writable NFS export can accept AUTH_NULL or mapped AUTH_SYS clients without prior authentication, subject only to directory write and search permissions.\nUI:N - The attacker directly sends rename operations and does not require a victim to perform any action.\nS:U - The corrupted directory state and resulting denial of service remain within the host kernel and filesystem security authority.\nC:N - The failure loses directory-offset mappings but creates no stale freed-object access, out-of-bounds read, or other information-disclosure primitive.\nI:L - A failed insertion can persistently desynchronize a live dentry from its maple-tree mapping, corrupting directory metadata and cookies, but it does not provide arbitrary data modification.\nA:H - The corrupted offsets can make local getdents or NFS READDIR repeat, omit, or fail to progress through entries, potentially rendering the exported directory unavailable to clients."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/libfs.c",
                        "include/linux/fs.h",
                        "mm/shmem.c"
                    ],
                    "versions": [
                        {
                            "version": "a2e459555c5f9da3e619b7e47a63f98574dc75f1",
                            "lessThan": "4b0fe71fb3965d0db83cdfc2f4fe0b3227d70113",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a2e459555c5f9da3e619b7e47a63f98574dc75f1",
                            "lessThan": "4642686699a46718d7f2fb5acd1e9d866a9d9cca",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a2e459555c5f9da3e619b7e47a63f98574dc75f1",
                            "lessThan": "e1b4c6a58304fd490124cc2b454d80edc786665c",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/libfs.c",
                        "include/linux/fs.h",
                        "mm/shmem.c"
                    ],
                    "versions": [
                        {
                            "version": "6.6",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.6",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.64",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.3",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.19",
                            "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": "6.6",
                                    "versionEndExcluding": "6.12.64"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.6",
                                    "versionEndExcluding": "6.18.3"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.6",
                                    "versionEndExcluding": "6.19"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/4b0fe71fb3965d0db83cdfc2f4fe0b3227d70113"
                },
                {
                    "url": "https://git.kernel.org/stable/c/4642686699a46718d7f2fb5acd1e9d866a9d9cca"
                },
                {
                    "url": "https://git.kernel.org/stable/c/e1b4c6a58304fd490124cc2b454d80edc786665c"
                }
            ],
            "title": "shmem: fix recovery on rename failures",
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}