Vulnerability-Lookup

GHSA-7QJR-375P-687V

Vulnerability from github – Published: 2026-10-14 15:32 – Updated: 2026-10-14 15:32

Details

In the Linux kernel, the following vulnerability has been resolved:

s390/boot: Avoid IPL parameter append past command line

A command line may occupy all but the terminating byte of COMMAND_LINE_SIZE. In that case append_ipl_block_parm() passes a zero size to the IPL parameter conversion helpers and points the destination one byte past early_command_line. The helpers subtract one from the unsigned size and write the converted parameter outside the command line buffer.

Convert the IPL parameter in the command line parsing buffer first. A parameter beginning with '=' can then replace the existing command line regardless of its length, while other parameters are appended only when space remains.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98403"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-14T14:17:51Z",
    "severity": null
  },
  "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 \u0027=\u0027 can then replace the existing command line\nregardless of its length, while other parameters are appended only when\nspace remains.",
  "id": "GHSA-7qjr-375p-687v",
  "modified": "2026-10-14T15:32:20Z",
  "published": "2026-10-14T15:32:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98403"
    },
    {
      "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-98403 (GCVE-0-2026-98403)

Vulnerability from cvelistv5 – Published: 2026-10-14 13:26 – Updated: 2026-10-19 09:18

Title

s390/boot: Avoid IPL parameter append past command line

Summary

In the Linux kernel, the following vulnerability has been resolved: s390/boot: Avoid IPL parameter append past command line A command line may occupy all but the terminating byte of COMMAND_LINE_SIZE. In that case append_ipl_block_parm() passes a zero size to the IPL parameter conversion helpers and points the destination one byte past early_command_line. The helpers subtract one from the unsigned size and write the converted parameter outside the command line buffer. Convert the IPL parameter in the command line parsing buffer first. A parameter beginning with '=' can then replace the existing command line regardless of its length, while other parameters are appended only when space remains.

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7056 records in the last 180 days details

References

4 references

URL	Tags
https://git.kernel.org/stable/c/af9866021a00ab9ee…
https://git.kernel.org/stable/c/73eec5a0d55916d7e…
https://git.kernel.org/stable/c/8d11bfec8666f8409…
https://git.kernel.org/stable/c/d76181dfabdaa7207…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 5ecb2da660ab8eddafe059a6a8a708465db89ca2 , < af9866021a00ab9eeacf0c33ee73f3d134b4ed70 (git) Affected: 5ecb2da660ab8eddafe059a6a8a708465db89ca2 , < 73eec5a0d55916d7e1115f5d03a7ffc06d6215cf (git) Affected: 5ecb2da660ab8eddafe059a6a8a708465db89ca2 , < 8d11bfec8666f8409fac9072e9c25b691d3e30ac (git) Affected: 5ecb2da660ab8eddafe059a6a8a708465db89ca2 , < d76181dfabdaa720703167393704efacba343442 (git)
Linux	Linux	Affected: 5.16 Unaffected: 0 , < 5.16 (semver) Unaffected: 6.12.112 , ≤ 6.12.* (semver) Unaffected: 6.18.53 , ≤ 6.18.* (semver) Unaffected: 7.2.7 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/s390/boot/ipl_parm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "af9866021a00ab9eeacf0c33ee73f3d134b4ed70",
              "status": "affected",
              "version": "5ecb2da660ab8eddafe059a6a8a708465db89ca2",
              "versionType": "git"
            },
            {
              "lessThan": "73eec5a0d55916d7e1115f5d03a7ffc06d6215cf",
              "status": "affected",
              "version": "5ecb2da660ab8eddafe059a6a8a708465db89ca2",
              "versionType": "git"
            },
            {
              "lessThan": "8d11bfec8666f8409fac9072e9c25b691d3e30ac",
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              "status": "affected",
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              "versionType": "git"
            }
          ]
        },
        {
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          "programFiles": [
            "arch/s390/boot/ipl_parm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.16"
            },
            {
              "lessThan": "5.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.112",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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          "value": "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 \u0027=\u0027 can then replace the existing command line\nregardless of its length, while other parameters are appended only when\nspace remains."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:18:56.682Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "url": "https://git.kernel.org/stable/c/d76181dfabdaa720703167393704efacba343442"
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    "cveId": "CVE-2026-98403",
    "datePublished": "2026-10-14T13:26:02.916Z",
    "dateReserved": "2026-09-25T10:25:14.347Z",
    "dateUpdated": "2026-10-19T09:18:56.682Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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