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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)
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Linux Linux Affected: 7.1
Unaffected: 0 , < 7.1 (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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              "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."
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    "redhat_vex": {
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      "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"
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}



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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.

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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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