{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2025-40348",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2025-04-16T07:20:57.187Z",
        "datePublished": "2025-12-16T13:30:22.368Z",
        "dateUpdated": "2026-05-11T21:47:37.835Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-05-11T21:47:37.835Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nslab: Avoid race on slab->obj_exts in alloc_slab_obj_exts\n\nIf two competing threads enter alloc_slab_obj_exts() and one of them\nfails to allocate the object extension vector, it might override the\nvalid slab->obj_exts allocated by the other thread with\nOBJEXTS_ALLOC_FAIL. This will cause the thread that lost this race and\nexpects a valid pointer to dereference a NULL pointer later on.\n\nUpdate slab->obj_exts atomically using cmpxchg() to avoid\nslab->obj_exts overrides by racing threads.\n\nThanks for Vlastimil and Suren's help with debugging."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "mm/slub.c"
                    ],
                    "versions": [
                        {
                            "version": "715b6a5b41dae39baeaa40d3386b548bb278b9c2",
                            "lessThan": "c7af5300d78460fc5037ddc77113ba3dbfe77dc0",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "07e38a54cabd9b4de7ceb7f075f29ffa463e458a",
                            "lessThan": "7c34feda6a9a203c9744281f1b6671b7dad2012d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "f7381b9116407ba2a429977c80ff8df953ea9354",
                            "lessThan": "6ed8bfd24ce1cb31742b09a3eb557cd008533eec",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "mm/slub.c"
                    ],
                    "versions": [
                        {
                            "version": "6.12.54",
                            "lessThan": "6.12.56",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.17.4",
                            "lessThan": "6.17.6",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.12.54",
                                    "versionEndExcluding": "6.12.56"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.17.4",
                                    "versionEndExcluding": "6.17.6"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/c7af5300d78460fc5037ddc77113ba3dbfe77dc0"
                },
                {
                    "url": "https://git.kernel.org/stable/c/7c34feda6a9a203c9744281f1b6671b7dad2012d"
                },
                {
                    "url": "https://git.kernel.org/stable/c/6ed8bfd24ce1cb31742b09a3eb557cd008533eec"
                }
            ],
            "title": "slab: Avoid race on slab->obj_exts in alloc_slab_obj_exts",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}