CVE-2022-50518 (GCVE-0-2022-50518)
Vulnerability from cvelistv5
Published
2025-10-07 15:19
Modified
2026-08-05 08:59
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: parisc: Fix locking in pdc_iodc_print() firmware call Utilize pdc_lock spinlock to protect parallel modifications of the iodc_dbuf[] buffer, check length to prevent buffer overflow of iodc_dbuf[], drop the iodc_retbuf[] buffer and fix some wrong indentings.
References
Impacted products
Vendor Product Version
Linux Linux Version: ef1afd4d79f0479960ff36bb5fe6ec6eba1ebff2
Version: ef1afd4d79f0479960ff36bb5fe6ec6eba1ebff2
Version: ef1afd4d79f0479960ff36bb5fe6ec6eba1ebff2
Version: 24319896af06b84f965bcefa0f2d926b726ed05b
Version: 2.6.24.5   ≤
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/parisc/kernel/firmware.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "04a603058e70b8b881bb7860b8bd649f931f2591",
              "status": "affected",
              "version": "ef1afd4d79f0479960ff36bb5fe6ec6eba1ebff2",
              "versionType": "git"
            },
            {
              "lessThan": "553bc5890ed96a8d006224c3a4673c47fee0d12a",
              "status": "affected",
              "version": "ef1afd4d79f0479960ff36bb5fe6ec6eba1ebff2",
              "versionType": "git"
            },
            {
              "lessThan": "7236aae5f81f3efbd93d0601e74fc05994bc2580",
              "status": "affected",
              "version": "ef1afd4d79f0479960ff36bb5fe6ec6eba1ebff2",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "24319896af06b84f965bcefa0f2d926b726ed05b",
              "versionType": "git"
            },
            {
              "lessThan": "2.6.25",
              "status": "affected",
              "version": "2.6.24.5",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/parisc/kernel/firmware.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.25"
            },
            {
              "lessThan": "2.6.25",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.18",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0.18",
                  "versionStartIncluding": "2.6.25",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.4",
                  "versionStartIncluding": "2.6.25",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.2",
                  "versionStartIncluding": "2.6.25",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "2.6.24.5",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable code is reached through local console paths on parisc\u2014most severely via write(2) to the PDC console TTY (/dev/ttyB) which calls pdc_console_tty_write \u2192 pdc_iodc_print, or via local printk/earlycon output\u2014not 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)\u2014not 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\u2019s 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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:59:02.991Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50518",
    "datePublished": "2025-10-07T15:19:13.040Z",
    "dateReserved": "2025-10-07T15:15:38.662Z",
    "dateUpdated": "2026-08-05T08:59:02.991Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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