Vulnerability-Lookup

GHSA-V97X-654R-4F82

Vulnerability from github – Published: 2026-10-18 18:31 – Updated: 2026-10-18 18:31

Details

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

KVM: s390: Fix _gaccess_shadow_fault()

In some circumstances, it is possible that the page of nested guest memory that is being shadowed is not present at all in the parent guest gmap. dat_entry_walk() will not find any leaf entry and return with -ENOENT, which will erroneously be propagated all the way to userspace.

Fix by manually calling gmap_link() on the memory of the nested guest that is being shadowed if the mapping was not already present.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98653"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-18T16:17:18Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: s390: Fix _gaccess_shadow_fault()\n\nIn some circumstances, it is possible that the page of nested guest\nmemory that is being shadowed is not present at all in the parent guest\ngmap. dat_entry_walk() will not find any leaf entry and return with\n-ENOENT, which will erroneously be propagated all the way to userspace.\n\nFix by manually calling gmap_link() on the memory of the nested guest\nthat is being shadowed if the mapping was not already present.",
  "id": "GHSA-v97x-654r-4f82",
  "modified": "2026-10-18T18:31:58Z",
  "published": "2026-10-18T18:31:58Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98653"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/94c43c7df46433ed4d1e18f13770b019ba977bd8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/faff4c8ff3dbec6d71b89dd281a0d17c4478fa44"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-98653 (GCVE-0-2026-98653)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:20 – Updated: 2026-10-19 09:23

Title

KVM: s390: Fix _gaccess_shadow_fault()

Summary

In the Linux kernel, the following vulnerability has been resolved: KVM: s390: Fix _gaccess_shadow_fault() In some circumstances, it is possible that the page of nested guest memory that is being shadowed is not present at all in the parent guest gmap. dat_entry_walk() will not find any leaf entry and return with -ENOENT, which will erroneously be propagated all the way to userspace. Fix by manually calling gmap_link() on the memory of the nested guest that is being shadowed if the mapping was not already present.

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6820 records in the last 180 days details

References

2 references

URL	Tags
https://git.kernel.org/stable/c/94c43c7df46433ed4…
https://git.kernel.org/stable/c/faff4c8ff3dbec6d7…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: e38c884df92119d96f652d51f82661dd2fc0b885 , < 94c43c7df46433ed4d1e18f13770b019ba977bd8 (git) Affected: e38c884df92119d96f652d51f82661dd2fc0b885 , < faff4c8ff3dbec6d71b89dd281a0d17c4478fa44 (git)
Linux	Linux	Affected: 7.0 Unaffected: 0 , < 7.0 (semver) Unaffected: 7.2.9 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/s390/kvm/s390/gaccess.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "94c43c7df46433ed4d1e18f13770b019ba977bd8",
              "status": "affected",
              "version": "e38c884df92119d96f652d51f82661dd2fc0b885",
              "versionType": "git"
            },
            {
              "lessThan": "faff4c8ff3dbec6d71b89dd281a0d17c4478fa44",
              "status": "affected",
              "version": "e38c884df92119d96f652d51f82661dd2fc0b885",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/s390/kvm/s390/gaccess.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.0"
            },
            {
              "lessThan": "7.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.9",
                  "versionStartIncluding": "7.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "7.0",
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                }
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            }
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: s390: Fix _gaccess_shadow_fault()\n\nIn some circumstances, it is possible that the page of nested guest\nmemory that is being shadowed is not present at all in the parent guest\ngmap. dat_entry_walk() will not find any leaf entry and return with\n-ENOENT, which will erroneously be propagated all the way to userspace.\n\nFix by manually calling gmap_link() on the memory of the nested guest\nthat is being shadowed if the mapping was not already present."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:23:22.624Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/94c43c7df46433ed4d1e18f13770b019ba977bd8"
        },
        {
          "url": "https://git.kernel.org/stable/c/faff4c8ff3dbec6d71b89dd281a0d17c4478fa44"
        }
      ],
      "title": "KVM: s390: Fix _gaccess_shadow_fault()",
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        "engine": "bippy-1.2.0"
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98653",
    "datePublished": "2026-10-18T15:20:24.848Z",
    "dateReserved": "2026-09-25T10:25:14.362Z",
    "dateUpdated": "2026-10-19T09:23:22.624Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
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