{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "5ecb2da660ab8eddafe059a6a8a708465db89ca2"
            },
            {
              "fixed": "af9866021a00ab9eeacf0c33ee73f3d134b4ed70"
            },
            {
              "fixed": "73eec5a0d55916d7e1115f5d03a7ffc06d6215cf"
            },
            {
              "fixed": "8d11bfec8666f8409fac9072e9c25b691d3e30ac"
            },
            {
              "fixed": "d76181dfabdaa720703167393704efacba343442"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.12.112"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.53"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98403.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/boot: Avoid IPL parameter append past command line\n\nA command line may occupy all but the terminating byte of\nCOMMAND_LINE_SIZE. In that case append_ipl_block_parm() passes a zero size\nto the IPL parameter conversion helpers and points the destination one\nbyte past early_command_line. The helpers subtract one from the unsigned\nsize and write the converted parameter outside the command line buffer.\n\nConvert the IPL parameter in the command line parsing buffer first. A\nparameter beginning with '=' can then replace the existing command line\nregardless of its length, while other parameters are appended only when\nspace remains.",
  "id": "CVE-2026-98403",
  "modified": "2026-10-16T02:30:39.283784363Z",
  "published": "2026-10-14T13:26:02.916Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/73eec5a0d55916d7e1115f5d03a7ffc06d6215cf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8d11bfec8666f8409fac9072e9c25b691d3e30ac"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/af9866021a00ab9eeacf0c33ee73f3d134b4ed70"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d76181dfabdaa720703167393704efacba343442"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98403.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98403"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "s390/boot: Avoid IPL parameter append past command line"
}