{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-31694",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-03-09T15:48:24.131Z",
        "datePublished": "2026-05-01T13:53:36.048Z",
        "dateUpdated": "2026-08-05T12:24:32.263Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-05T12:24:32.263Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfuse: reject oversized dirents in page cache\n\nfuse_add_dirent_to_cache() computes a serialized dirent size from the\nserver-controlled namelen field and copies the dirent into a single\npage-cache page. The existing logic only checks whether the dirent fits\nin the remaining space of the current page and advances to a fresh page\nif not. It never checks whether the dirent itself exceeds PAGE_SIZE.\n\nAs a result, a malicious FUSE server can return a dirent with\nnamelen=4095, producing a serialized record size of 4120 bytes. On 4 KiB\npage systems this causes memcpy() to overflow the cache page by 24 bytes\ninto the following kernel page.\n\nReject dirents that cannot fit in a single page before copying them into\nthe readdir cache."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                        "baseScore": 7.8,
                        "baseSeverity": "HIGH"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "AV:L - The vulnerable path is reached through local filesystem operations on a FUSE mount, with malicious replies supplied via a local /dev/fuse userspace daemon rather than directly by network packets.\nAC:L - A malicious FUSE server can deterministically set FOPEN_CACHE_DIR and return a dirent with namelen=4095; the overflow occurs during ordinary readdir/getdents on common 4 KiB page systems.\nPR:L - An unprivileged local user can plausibly run and access their own FUSE filesystem, including through user-namespace-capable FUSE mounts where available, and does not need real init-namespace root.\nUI:N - The malicious local mounter can trigger getdents/readdir on their own FUSE directory without requiring a separate victim action.\nS:U - The bug is kernel memory corruption within the same host kernel security authority and does not cross a VM, IOMMU, or similar scope boundary.\nC:H - The bug is an attacker-controlled out-of-bounds write into the following kernel page, and such kernel memory corruption can be leveraged to expose sensitive kernel or process memory.\nI:H - The attacker controls the oversized serialized dirent bytes copied past the cache page, giving a kernel memory corruption primitive that can plausibly be developed into arbitrary modification or code execution.\nA:H - The overflow can corrupt adjacent kernel memory or fault during the memcpy/kmap access path, making kernel oops, panic, or system instability a high-impact availability outcome."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/fuse/readdir.c"
                    ],
                    "versions": [
                        {
                            "version": "27992ef80770d61a57f6c3a551735b08cefdffa3",
                            "lessThan": "7de93abfaae1b2dc94da8a07a36421bd073f1d8f",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "27992ef80770d61a57f6c3a551735b08cefdffa3",
                            "lessThan": "474ce83c96a55f2eeb14dee2be375eeadfdacdf5",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "27992ef80770d61a57f6c3a551735b08cefdffa3",
                            "lessThan": "51a8de6c50bf947c8f534cd73da4c8f0a13e7bed",
                            "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/fuse/readdir.c"
                    ],
                    "versions": [
                        {
                            "version": "6.15",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.15",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.25",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0.2",
                            "lessThanOrEqual": "7.0.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1",
                            "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": "6.15",
                                    "versionEndExcluding": "6.18.25"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.15",
                                    "versionEndExcluding": "7.0.2"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.15",
                                    "versionEndExcluding": "7.1"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/7de93abfaae1b2dc94da8a07a36421bd073f1d8f"
                },
                {
                    "url": "https://git.kernel.org/stable/c/474ce83c96a55f2eeb14dee2be375eeadfdacdf5"
                },
                {
                    "url": "https://git.kernel.org/stable/c/51a8de6c50bf947c8f534cd73da4c8f0a13e7bed"
                }
            ],
            "title": "fuse: reject oversized dirents in page cache",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}