CVE-2026-72291 (GCVE-0-2026-72291)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:55 – Updated: 2026-08-17 05:42
VLAI
Title
KVM: s390: Fix unlikely race in try_get_locked_pte()
Summary
In the Linux kernel, the following vulnerability has been resolved: KVM: s390: Fix unlikely race in try_get_locked_pte() Fix an unlikely race in try_get_locked_pte(), which could have happened if puds or pmds get unmapped between the p?dp_get() and p?d_offset() functions.
Severity
9.3 (Critical)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 89fa757931dc0bcd64ef22b28d1d5ad00c5d02f4 , < ce587046baacdeb774b7756ab29b3f594e429004 (git)
Affected: 89fa757931dc0bcd64ef22b28d1d5ad00c5d02f4 , < 5670b7f927f8d98685f3f5873dbf9f8d7a5a63f3 (git)
guessed Create a notification for this product.
Linux Linux Affected: 7.1
Unaffected: 0 , < 7.1 (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/s390/mm/gmap_helpers.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ce587046baacdeb774b7756ab29b3f594e429004",
              "status": "affected",
              "version": "89fa757931dc0bcd64ef22b28d1d5ad00c5d02f4",
              "versionType": "git"
            },
            {
              "lessThan": "5670b7f927f8d98685f3f5873dbf9f8d7a5a63f3",
              "status": "affected",
              "version": "89fa757931dc0bcd64ef22b28d1d5ad00c5d02f4",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/s390/mm/gmap_helpers.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.1"
            },
            {
              "lessThan": "7.1",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "7.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "7.1",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: s390: Fix unlikely race in try_get_locked_pte()\n\nFix an unlikely race in try_get_locked_pte(), which could have happened\nif puds or pmds get unmapped between the p?dp_get() and p?d_offset()\nfunctions."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.3,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The flaw is in KVM s390 host page-table walking triggered by local guest hypervisor intercepts (UVC, ESSA) and /dev/kvm ioctls, not by remote network packet handling.\nAC:L - An attacker can control both sides of the race using multiple vCPUs or threads to concurrently trigger KVM gmap unmap/PV operations while host backing mappings are torn down via slot changes or ballooning.\nPR:N - A malicious s390 KVM guest can reach the vulnerable paths through hypervisor instruction intercepts without requiring host administrator privileges or CAP_SYS_ADMIN on the hypervisor.\nUI:N - Exploitation requires only attacker-controlled guest execution and concurrent memory management activity, with no additional victim actions such as opening files or mounting filesystems.\nS:C - Corrupting host kernel page tables while servicing guest memory operations crosses the guest-host virtualization security boundary and enables VM escape-class impact on shared IBM Z KVM hosts.\nC:H - The race dereferences freed intermediate page-table pages and can yield attacker-influenced PTE pointers, enabling arbitrary kernel memory disclosure through subsequent PTE reads.\nI:H - Corrupted PTE pointers lead to atomic PTE bit updates and secure-page folio operations on attacker-chosen kernel memory, providing a plausible path to arbitrary write or code execution.\nA:H - Dereferencing freed or collapsed page-table structures or corrupting PTEs can cause kernel oops, panic, or repeated guest-triggered crashes denying host availability."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:42:25.857Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ce587046baacdeb774b7756ab29b3f594e429004"
        },
        {
          "url": "https://git.kernel.org/stable/c/5670b7f927f8d98685f3f5873dbf9f8d7a5a63f3"
        }
      ],
      "title": "KVM: s390: Fix unlikely race in try_get_locked_pte()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72291",
    "datePublished": "2026-08-15T05:55:12.597Z",
    "dateReserved": "2026-08-09T03:40:39.917Z",
    "dateUpdated": "2026-08-17T05:42:25.857Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-72291",
      "date": "2026-09-21",
      "epss": "0.00168",
      "percentile": "0.06428"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "arch/s390/mm/gmap_helpers.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "ce587046baacdeb774b7756ab29b3f594e429004",
                    "status": "affected",
                    "version": "89fa757931dc0bcd64ef22b28d1d5ad00c5d02f4",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "5670b7f927f8d98685f3f5873dbf9f8d7a5a63f3",
                    "status": "affected",
                    "version": "89fa757931dc0bcd64ef22b28d1d5ad00c5d02f4",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "arch/s390/mm/gmap_helpers.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "7.1"
                  },
                  {
                    "lessThan": "7.1",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "7.1.*",
                    "status": "unaffected",
                    "version": "7.1.5",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "7.2",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: s390: Fix unlikely race in try_get_locked_pte()\n\nFix an unlikely race in try_get_locked_pte(), which could have happened\nif puds or pmds get unmapped between the p?dp_get() and p?d_offset()\nfunctions."
          }
        ],
        "id": "CVE-2026-72291",
        "lastModified": "2026-08-17T06:18:31.917",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 9.3,
                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 2.5,
              "impactScore": 6.0,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-08-15T06:22:01.130",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/5670b7f927f8d98685f3f5873dbf9f8d7a5a63f3"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/ce587046baacdeb774b7756ab29b3f594e429004"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-19T08:02:24+00:00",
      "cve": "CVE-2026-72291",
      "id": "CVE-2026-72291",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: KVM: s390: Fix unlikely race in try_get_locked_pte()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72291.json",
      "version": "3"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.