{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2025-68167",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2025-12-16T13:41:40.250Z",
        "datePublished": "2025-12-16T13:42:47.480Z",
        "dateUpdated": "2026-08-05T12:09:56.647Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-05T12:09:56.647Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngpiolib: fix invalid pointer access in debugfs\n\nIf the memory allocation in gpiolib_seq_start() fails, the s->private\nfield remains uninitialized and is later dereferenced without checking\nin gpiolib_seq_stop(). Initialize s->private to NULL before calling\nkzalloc() and check it before dereferencing it."
                }
            ],
            "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 vulnerability is reached only by reading the local debugfs file /sys/kernel/debug/gpio; there is no network or remote path into gpiolib's seq_file handlers.\nAC:L - The attacker fully controls both required conditions — memory pressure to make the small GFP_KERNEL kzalloc fail, and unbounded repetition of read()/lseek() on the file, each of which drives multiple start/stop cycles — so the failure can simply be retried until it lands.\nPR:L - The gpio debugfs file is explicitly created world-readable (mode 0444) and needs no capability, so any unprivileged local user reaches it on the many embedded, automotive, industrial and Android deployments that mount debugfs traversable (mode=755 or uid/gid options), which is common precisely because GPIO debugging is the reason debugfs is mounted there.\nUI:N - The attacker triggers the bug entirely through their own read() calls on the debugfs file; no action by any other user or victim process is needed.\nS:U - The corruption stays within the kernel's own security authority — freed slab memory and per-CPU SRCU counters — with no crossing of a VM, IOMMU or sandbox boundary.\nC:H - gpiolib_seq_stop() reads priv->idx out of an already-freed kmalloc-16 object, and the accompanying double free corrupts the slab freelist, enabling overlapping allocations that yield arbitrary kernel memory disclosure.\nI:H - The stale idx is fed unvalidated into __srcu_read_unlock(), producing this_cpu_inc() at an attacker-influenced out-of-bounds offset from the per-CPU srcu_data, and the subsequent kfree() of an object owned by another allocation is a classic double-free write primitive.\nA:H - On the first iteration s->private is NULL, so gpiolib_seq_stop() dereferences NULL and oopses; on later iterations the use-after-free, wild per-CPU increment and double free reliably panic the kernel."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/gpio/gpiolib.c"
                    ],
                    "versions": [
                        {
                            "version": "e348544f7994d252427ed3ae637c7081cbb90f66",
                            "lessThan": "70180a6031056096c93ed2f47c41803268bdd91c",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "e348544f7994d252427ed3ae637c7081cbb90f66",
                            "lessThan": "3c91c8f424d3e44c8645ab765a38773e58afb07d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "e348544f7994d252427ed3ae637c7081cbb90f66",
                            "lessThan": "2f6115ad8864cf3f48598f26c74c7c8e5c391919",
                            "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/gpio/gpiolib.c"
                    ],
                    "versions": [
                        {
                            "version": "6.9",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.9",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.58",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.17.8",
                            "lessThanOrEqual": "6.17.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18",
                            "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": "6.9",
                                    "versionEndExcluding": "6.12.58"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.9",
                                    "versionEndExcluding": "6.17.8"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.9",
                                    "versionEndExcluding": "6.18"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/70180a6031056096c93ed2f47c41803268bdd91c"
                },
                {
                    "url": "https://git.kernel.org/stable/c/3c91c8f424d3e44c8645ab765a38773e58afb07d"
                },
                {
                    "url": "https://git.kernel.org/stable/c/2f6115ad8864cf3f48598f26c74c7c8e5c391919"
                }
            ],
            "title": "gpiolib: fix invalid pointer access in debugfs",
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}