{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2022-50518",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2025-10-07T15:15:38.662Z",
        "datePublished": "2025-10-07T15:19:13.040Z",
        "dateUpdated": "2026-08-05T08:59:02.991Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-05T08:59:02.991Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nparisc: Fix locking in pdc_iodc_print() firmware call\n\nUtilize pdc_lock spinlock to protect parallel modifications of the\niodc_dbuf[] buffer, check length to prevent buffer overflow of\niodc_dbuf[], drop the iodc_retbuf[] buffer and fix some wrong\nindentings."
                }
            ],
            "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 code is reached through local console paths on parisc—most severely via write(2) to the PDC console TTY (/dev/ttyB) which calls pdc_console_tty_write → pdc_iodc_print, or via local printk/earlycon output—not via network packet processing.\nAC:L - An attacker who can write to the PDC console TTY can reliably overflow iodc_dbuf by sending a payload larger than 4096 bytes without newlines; write_room advertises 32768 with no chunking limit, so no attacker-independent conditions are required.\nPR:L - Exploitation needs only an unprivileged local principal able to open/write the PDC console device (e.g., a user logged in on ttyB0 under CONFIG_PDC_CONSOLE, or otherwise permitted access to that TTY)—not real root or init-namespace admin capabilities.\nUI:N - No separate victim action is required; the attacker triggers the overflow directly by writing to the console TTY (or otherwise inducing console output on the vulnerable path).\nS:U - Impact stays within the host kernel’s authority (local memory corruption / privilege escalation on the same system); this is not a VM escape, IOMMU bypass, or other cross-authority boundary crossing.\nC:H - Attacker-controlled out-of-bounds writes into the kernel BSS buffer iodc_dbuf can corrupt adjacent kernel state and are reasonably leveraged for arbitrary read primitives, so confidentiality impact is High under kernel memory-corruption guidance.\nI:H - The same attacker-controlled BSS overflow enables corruption of kernel data and plausible control-flow hijacking / arbitrary write primitives, so integrity impact is High.\nA:H - The overflow and related unlocked concurrent use of iodc_dbuf can cause kernel oops/panic or otherwise crash the system, yielding High availability impact."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "arch/parisc/kernel/firmware.c"
                    ],
                    "versions": [
                        {
                            "version": "ef1afd4d79f0479960ff36bb5fe6ec6eba1ebff2",
                            "lessThan": "04a603058e70b8b881bb7860b8bd649f931f2591",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ef1afd4d79f0479960ff36bb5fe6ec6eba1ebff2",
                            "lessThan": "553bc5890ed96a8d006224c3a4673c47fee0d12a",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "ef1afd4d79f0479960ff36bb5fe6ec6eba1ebff2",
                            "lessThan": "7236aae5f81f3efbd93d0601e74fc05994bc2580",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "24319896af06b84f965bcefa0f2d926b726ed05b",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "2.6.24.5",
                            "lessThan": "2.6.25",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "arch/parisc/kernel/firmware.c"
                    ],
                    "versions": [
                        {
                            "version": "2.6.25",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "2.6.25",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.0.18",
                            "lessThanOrEqual": "6.0.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.4",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.2",
                            "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": "2.6.25",
                                    "versionEndExcluding": "6.0.18"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.25",
                                    "versionEndExcluding": "6.1.4"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.25",
                                    "versionEndExcluding": "6.2"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.24.5"
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            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/04a603058e70b8b881bb7860b8bd649f931f2591"
                },
                {
                    "url": "https://git.kernel.org/stable/c/553bc5890ed96a8d006224c3a4673c47fee0d12a"
                },
                {
                    "url": "https://git.kernel.org/stable/c/7236aae5f81f3efbd93d0601e74fc05994bc2580"
                }
            ],
            "title": "parisc: Fix locking in pdc_iodc_print() firmware call",
            "x_generator": {
                "engine": "bippy-1.2.0"
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}