{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2025-40049",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2025-04-16T07:20:57.157Z",
        "datePublished": "2025-10-28T11:48:25.862Z",
        "dateUpdated": "2026-05-11T21:41:29.576Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-05-11T21:41:29.576Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nSquashfs: fix uninit-value in squashfs_get_parent\n\nSyzkaller reports a \"KMSAN: uninit-value in squashfs_get_parent\" bug.\n\nThis is caused by open_by_handle_at() being called with a file handle\ncontaining an invalid parent inode number.  In particular the inode number\nis that of a symbolic link, rather than a directory.\n\nSquashfs_get_parent() gets called with that symbolic link inode, and\naccesses the parent member field.\n\n\tunsigned int parent_ino = squashfs_i(inode)->parent;\n\nBecause non-directory inodes in Squashfs do not have a parent value, this\nis uninitialised, and this causes an uninitialised value access.\n\nThe fix is to initialise parent with the invalid inode 0, which will cause\nan EINVAL error to be returned.\n\nRegular inodes used to share the parent field with the block_list_start\nfield.  This is removed in this commit to enable the parent field to\ncontain the invalid inode number 0."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/squashfs/inode.c",
                        "fs/squashfs/squashfs_fs_i.h"
                    ],
                    "versions": [
                        {
                            "version": "122601408d20c77704268f1dea9f9ce4abf997c2",
                            "lessThan": "f81a5bc9e924ee1950e0dd82bd10749048390f6e",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
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                            "lessThan": "382a47fae449e554ef1e8c198667fd2f3270b945",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "122601408d20c77704268f1dea9f9ce4abf997c2",
                            "lessThan": "61d38b5ce2782bff3cacaacbb8164087a73ed1a5",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "122601408d20c77704268f1dea9f9ce4abf997c2",
                            "lessThan": "81a2bca52d43fc9d9abf07408b91255131c5dc53",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "122601408d20c77704268f1dea9f9ce4abf997c2",
                            "lessThan": "c28b0ca029edf5d0558abcd76cb8c732706cd339",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "122601408d20c77704268f1dea9f9ce4abf997c2",
                            "lessThan": "1b3ccd0019132880c94bb00ca7088c1749308f82",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "122601408d20c77704268f1dea9f9ce4abf997c2",
                            "lessThan": "91b99db7a92e57ff48a96a1b10fddfd2547e7f53",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "122601408d20c77704268f1dea9f9ce4abf997c2",
                            "lessThan": "74058c0a9fc8b2b4d5f4a0ef7ee2cfa66a9e49cf",
                            "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/squashfs/inode.c",
                        "fs/squashfs/squashfs_fs_i.h"
                    ],
                    "versions": [
                        {
                            "version": "2.6.29",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "2.6.29",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.4.301",
                            "lessThanOrEqual": "5.4.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.246",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.195",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.156",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.112",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.53",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.17.3",
                            "lessThanOrEqual": "6.17.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
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                            "negate": false,
                            "cpeMatch": [
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                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.29",
                                    "versionEndExcluding": "5.4.301"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.29",
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                                    "versionEndExcluding": "6.18"
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            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/f81a5bc9e924ee1950e0dd82bd10749048390f6e"
                },
                {
                    "url": "https://git.kernel.org/stable/c/382a47fae449e554ef1e8c198667fd2f3270b945"
                },
                {
                    "url": "https://git.kernel.org/stable/c/61d38b5ce2782bff3cacaacbb8164087a73ed1a5"
                },
                {
                    "url": "https://git.kernel.org/stable/c/81a2bca52d43fc9d9abf07408b91255131c5dc53"
                },
                {
                    "url": "https://git.kernel.org/stable/c/c28b0ca029edf5d0558abcd76cb8c732706cd339"
                },
                {
                    "url": "https://git.kernel.org/stable/c/1b3ccd0019132880c94bb00ca7088c1749308f82"
                },
                {
                    "url": "https://git.kernel.org/stable/c/91b99db7a92e57ff48a96a1b10fddfd2547e7f53"
                },
                {
                    "url": "https://git.kernel.org/stable/c/74058c0a9fc8b2b4d5f4a0ef7ee2cfa66a9e49cf"
                }
            ],
            "title": "Squashfs: fix uninit-value in squashfs_get_parent",
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}