{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2025-38709",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2025-04-16T04:51:24.033Z",
        "datePublished": "2025-09-04T15:32:59.818Z",
        "dateUpdated": "2026-05-11T21:33:28.158Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-05-11T21:33:28.158Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nloop: Avoid updating block size under exclusive owner\n\nSyzbot came up with a reproducer where a loop device block size is\nchanged underneath a mounted filesystem. This causes a mismatch between\nthe block device block size and the block size stored in the superblock\ncausing confusion in various places such as fs/buffer.c. The particular\nissue triggered by syzbot was a warning in __getblk_slow() due to\nrequested buffer size not matching block device block size.\n\nFix the problem by getting exclusive hold of the loop device to change\nits block size. This fails if somebody (such as filesystem) has already\nan exclusive ownership of the block device and thus prevents modifying\nthe loop device under some exclusive owner which doesn't expect it."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/block/loop.c"
                    ],
                    "versions": [
                        {
                            "version": "89e4fdecb51cf5535867026274bc97de9480ade5",
                            "lessThan": "457d2c5e112fd08dc1039b1ae39a83ec1782360d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "89e4fdecb51cf5535867026274bc97de9480ade5",
                            "lessThan": "139a000d20f2f38ce34296feddd641d730fe1c08",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "89e4fdecb51cf5535867026274bc97de9480ade5",
                            "lessThan": "b928438cc87c0bf7ae078e4b7b6e14261e84c5c5",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "89e4fdecb51cf5535867026274bc97de9480ade5",
                            "lessThan": "5d67b30aefeb7a949040bbb1b4e3b84c5d29a624",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "89e4fdecb51cf5535867026274bc97de9480ade5",
                            "lessThan": "7e49538288e523427beedd26993d446afef1a6fb",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/block/loop.c"
                    ],
                    "versions": [
                        {
                            "version": "4.14",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "4.14",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.109",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.43",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.15.11",
                            "lessThanOrEqual": "6.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.16.2",
                            "lessThanOrEqual": "6.16.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.17",
                            "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": "4.14",
                                    "versionEndExcluding": "6.6.109"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.14",
                                    "versionEndExcluding": "6.12.43"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.14",
                                    "versionEndExcluding": "6.15.11"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.14",
                                    "versionEndExcluding": "6.16.2"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.14",
                                    "versionEndExcluding": "6.17"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/457d2c5e112fd08dc1039b1ae39a83ec1782360d"
                },
                {
                    "url": "https://git.kernel.org/stable/c/139a000d20f2f38ce34296feddd641d730fe1c08"
                },
                {
                    "url": "https://git.kernel.org/stable/c/b928438cc87c0bf7ae078e4b7b6e14261e84c5c5"
                },
                {
                    "url": "https://git.kernel.org/stable/c/5d67b30aefeb7a949040bbb1b4e3b84c5d29a624"
                },
                {
                    "url": "https://git.kernel.org/stable/c/7e49538288e523427beedd26993d446afef1a6fb"
                }
            ],
            "title": "loop: Avoid updating block size under exclusive owner",
            "x_generator": {
                "engine": "bippy-1.2.0"
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        }
    }
}