Vulnerability-Lookup

OESA-2026-3709 (CVE-2026-64561)

Vulnerability from osv_openeuler – Published: 2026-09-14 16:33 – Updated: 2026-09-14 16:33 – Source website

Summary

kernel security update

Details

The Linux Kernel, the operating system core itself.

Security Fix(es):

In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Check for invalid/obsolete root after making MMU pages available\n\nCheck for a \"stale\" page fault, i.e. for an invalid and/or obsolete root, after making MMU pages available for the shadow MMU. If reclaiming shadow pages zaps an in-use root, i.e. marks it invalid, then KVM will attempt to map memory into an invalid root. On its own, populating an invalid root is \"fine\", but because child shadow pages inherit their parent's role, any children created during the map/fetch will be created as invalid pages, thus violating KVM's invariant that invalid pages are never on the list of active MMU pages.\n\nNote, the underlying flaw has existed since KVM first started tracking invalid roots in 2008 (commit 2e53d63acba7, \"KVM: MMU: ignore zapped root pagetables\"), but the true badness only came along in 2020 (Linux 5.9) with the invariant that invalid shadow pages can't be on the list of active pages.\n\nNote #2, inheriting role.invalid when creating child shadow pages is also far from ideal; that flaw will be addressed separately.(CVE-2026-64561)

Severity

8.8 (High)


                    
                      CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-64561	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "bpftool-6.6.0-159.4.13.167.oe2403sp4.aarch64.rpm",
          "bpftool-debuginfo-6.6.0-159.4.13.167.oe2403sp4.aarch64.rpm",
          "kernel-6.6.0-159.4.13.167.oe2403sp4.aarch64.rpm",
          "kernel-64k-6.6.0-159.4.13.167.oe2403sp4+64k.aarch64.rpm",
          "kernel-64k-devel-6.6.0-159.4.13.167.oe2403sp4+64k.aarch64.rpm",
          "kernel-64k-extra-modules-6.6.0-159.4.13.167.oe2403sp4+64k.aarch64.rpm",
          "kernel-64k-source-6.6.0-159.4.13.167.oe2403sp4+64k.aarch64.rpm",
          "kernel-debuginfo-6.6.0-159.4.13.167.oe2403sp4.aarch64.rpm",
          "kernel-debugsource-6.6.0-159.4.13.167.oe2403sp4.aarch64.rpm",
          "kernel-devel-6.6.0-159.4.13.167.oe2403sp4.aarch64.rpm",
          "kernel-extra-modules-6.6.0-159.4.13.167.oe2403sp4.aarch64.rpm",
          "kernel-headers-6.6.0-159.4.13.167.oe2403sp4.aarch64.rpm",
          "kernel-source-6.6.0-159.4.13.167.oe2403sp4.aarch64.rpm",
          "kernel-tools-6.6.0-159.4.13.167.oe2403sp4.aarch64.rpm",
          "kernel-tools-debuginfo-6.6.0-159.4.13.167.oe2403sp4.aarch64.rpm",
          "kernel-tools-devel-6.6.0-159.4.13.167.oe2403sp4.aarch64.rpm",
          "perf-6.6.0-159.4.13.167.oe2403sp4.aarch64.rpm",
          "perf-debuginfo-6.6.0-159.4.13.167.oe2403sp4.aarch64.rpm",
          "python3-perf-6.6.0-159.4.13.167.oe2403sp4.aarch64.rpm",
          "python3-perf-debuginfo-6.6.0-159.4.13.167.oe2403sp4.aarch64.rpm"
        ],
        "src": [
          "kernel-6.6.0-159.4.13.167.oe2403sp4.src.rpm"
        ],
        "x86_64": [
          "bpftool-6.6.0-159.4.13.167.oe2403sp4.x86_64.rpm",
          "bpftool-debuginfo-6.6.0-159.4.13.167.oe2403sp4.x86_64.rpm",
          "kernel-6.6.0-159.4.13.167.oe2403sp4.x86_64.rpm",
          "kernel-debuginfo-6.6.0-159.4.13.167.oe2403sp4.x86_64.rpm",
          "kernel-debugsource-6.6.0-159.4.13.167.oe2403sp4.x86_64.rpm",
          "kernel-devel-6.6.0-159.4.13.167.oe2403sp4.x86_64.rpm",
          "kernel-extra-modules-6.6.0-159.4.13.167.oe2403sp4.x86_64.rpm",
          "kernel-headers-6.6.0-159.4.13.167.oe2403sp4.x86_64.rpm",
          "kernel-source-6.6.0-159.4.13.167.oe2403sp4.x86_64.rpm",
          "kernel-tools-6.6.0-159.4.13.167.oe2403sp4.x86_64.rpm",
          "kernel-tools-debuginfo-6.6.0-159.4.13.167.oe2403sp4.x86_64.rpm",
          "kernel-tools-devel-6.6.0-159.4.13.167.oe2403sp4.x86_64.rpm",
          "perf-6.6.0-159.4.13.167.oe2403sp4.x86_64.rpm",
          "perf-debuginfo-6.6.0-159.4.13.167.oe2403sp4.x86_64.rpm",
          "python3-perf-6.6.0-159.4.13.167.oe2403sp4.x86_64.rpm",
          "python3-perf-debuginfo-6.6.0-159.4.13.167.oe2403sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP4",
        "name": "kernel",
        "purl": "pkg:rpm/openEuler/kernel\u0026distro=openEuler-24.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.6.0-159.4.13.167.oe2403sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "High"
  },
  "details": "The Linux Kernel, the operating system core itself.\r\n\r\nSecurity Fix(es):\n\nIn the Linux kernel, the following vulnerability has been resolved:\\n\\nKVM: x86: Check for invalid/obsolete root *after* making MMU pages available\\n\\nCheck for a \\\u0026quot;stale\\\u0026quot; page fault, i.e. for an invalid and/or obsolete root, after making MMU pages available for the shadow MMU. If reclaiming shadow pages zaps an in-use root, i.e. marks it invalid, then KVM will attempt to map memory into an invalid root. On its own, populating an invalid root is \\\u0026quot;fine\\\u0026quot;, but because child shadow pages inherit their parent\u0026apos;s role, any children created during the map/fetch will be created as invalid pages, thus violating KVM\u0026apos;s invariant that invalid pages are never on the list of active MMU pages.\\n\\nNote, the underlying flaw has existed since KVM first started tracking invalid roots in 2008 (commit 2e53d63acba7, \\\u0026quot;KVM: MMU: ignore zapped root pagetables\\\u0026quot;), but the true badness only came along in 2020 (Linux 5.9) with the invariant that invalid shadow pages can\u0026apos;t be on the list of active pages.\\n\\nNote #2, inheriting role.invalid when creating child shadow pages is also far from ideal; that flaw will be addressed separately.(CVE-2026-64561)",
  "id": "OESA-2026-3709",
  "modified": "2026-09-14T16:33:36Z",
  "published": "2026-09-14T16:33:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3709"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64561"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "kernel security update",
  "upstream": [
    "CVE-2026-64561"
  ]
}

CVE-2026-64561 (GCVE-0-2026-64561)

Vulnerability from cvelistv5 – Published: 2026-08-04 06:23 – Updated: 2026-08-27 12:39

Title

KVM: x86: Check for invalid/obsolete root *after* making MMU pages available

Summary

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Check for invalid/obsolete root *after* making MMU pages available Check for a "stale" page fault, i.e. for an invalid and/or obsolete root, after making MMU pages available for the shadow MMU. If reclaiming shadow pages zaps an in-use root, i.e. marks it invalid, then KVM will attempt to map memory into an invalid root. On its own, populating an invalid root is "fine", but because child shadow pages inherit their parent's role, any children created during the map/fetch will be created as invalid pages, thus violating KVM's invariant that invalid pages are never on the list of active MMU pages. Note, the underlying flaw has existed since KVM first started tracking invalid roots in 2008 (commit 2e53d63acba7, "KVM: MMU: ignore zapped root pagetables"), but the true badness only came along in 2020 (Linux 5.9) with the invariant that invalid shadow pages can't be on the list of active pages. Note #2, inheriting role.invalid when creating child shadow pages is also far from ideal; that flaw will be addressed separately.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/62ef67af1878fa2cd…
https://git.kernel.org/stable/c/65c4f7a1028cf01a9…
https://git.kernel.org/stable/c/35e77467610c4a37c…
https://git.kernel.org/stable/c/0026dbb7de8ea76e9…
https://git.kernel.org/stable/c/f3477a6a4164f1528…
https://git.kernel.org/stable/c/bce0d3c26e2c761a4…
https://git.kernel.org/stable/c/2abd5287f08319fa3…
https://github.com/V4bel/Zapscape

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: f95eec9bed76d42194c23153cb1cc8f186bf91cb , < 62ef67af1878fa2cd066642f2f59e33ade95f637 (git) Affected: f95eec9bed76d42194c23153cb1cc8f186bf91cb , < 65c4f7a1028cf01a93a2762d679c289810ede990 (git) Affected: f95eec9bed76d42194c23153cb1cc8f186bf91cb , < 35e77467610c4a37cb0ff54ee56b85f73b1f5700 (git) Affected: f95eec9bed76d42194c23153cb1cc8f186bf91cb , < 0026dbb7de8ea76e97d6edf42fc3cc084564e2bf (git) Affected: f95eec9bed76d42194c23153cb1cc8f186bf91cb , < f3477a6a4164f15287444eda685b5f6405dbd1e5 (git) Affected: f95eec9bed76d42194c23153cb1cc8f186bf91cb , < bce0d3c26e2c761a4bf43c8949f333fc7374eb2d (git) Affected: f95eec9bed76d42194c23153cb1cc8f186bf91cb , < 2abd5287f08319fa35764566b15c6e22cb1068db (git)
Linux	Linux	Affected: 5.9 Unaffected: 0 , < 5.9 (semver) Unaffected: 5.15.218 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.148 , ≤ 6.6.* (semver) Unaffected: 6.12.101 , ≤ 6.12.* (semver) Unaffected: 6.18.42 , ≤ 6.18.* (semver) Unaffected: 7.1.6 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/mmu/mmu.c",
            "arch/x86/kvm/mmu/paging_tmpl.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "62ef67af1878fa2cd066642f2f59e33ade95f637",
              "status": "affected",
              "version": "f95eec9bed76d42194c23153cb1cc8f186bf91cb",
              "versionType": "git"
            },
            {
              "lessThan": "65c4f7a1028cf01a93a2762d679c289810ede990",
              "status": "affected",
              "version": "f95eec9bed76d42194c23153cb1cc8f186bf91cb",
              "versionType": "git"
            },
            {
              "lessThan": "35e77467610c4a37cb0ff54ee56b85f73b1f5700",
              "status": "affected",
              "version": "f95eec9bed76d42194c23153cb1cc8f186bf91cb",
              "versionType": "git"
            },
            {
              "lessThan": "0026dbb7de8ea76e97d6edf42fc3cc084564e2bf",
              "status": "affected",
              "version": "f95eec9bed76d42194c23153cb1cc8f186bf91cb",
              "versionType": "git"
            },
            {
              "lessThan": "f3477a6a4164f15287444eda685b5f6405dbd1e5",
              "status": "affected",
              "version": "f95eec9bed76d42194c23153cb1cc8f186bf91cb",
              "versionType": "git"
            },
            {
              "lessThan": "bce0d3c26e2c761a4bf43c8949f333fc7374eb2d",
              "status": "affected",
              "version": "f95eec9bed76d42194c23153cb1cc8f186bf91cb",
              "versionType": "git"
            },
            {
              "lessThan": "2abd5287f08319fa35764566b15c6e22cb1068db",
              "status": "affected",
              "version": "f95eec9bed76d42194c23153cb1cc8f186bf91cb",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/mmu/mmu.c",
            "arch/x86/kvm/mmu/paging_tmpl.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.9"
            },
            {
              "lessThan": "5.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.218",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.148",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.101",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "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": "5.15.218",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.183",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.148",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.101",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.42",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.6",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.9",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Check for invalid/obsolete root *after* making MMU pages available\n\nCheck for a \"stale\" page fault, i.e. for an invalid and/or obsolete root,\nafter making MMU pages available for the shadow MMU.  If reclaiming shadow\npages zaps an in-use root, i.e. marks it invalid, then KVM will attempt to\nmap memory into an invalid root.  On its own, populating an invalid root is\n\"fine\", but because child shadow pages inherit their parent\u0027s role, any\nchildren created during the map/fetch will be created as invalid pages,\nthus violating KVM\u0027s invariant that invalid pages are never on the list of\nactive MMU pages.\n\nNote, the underlying flaw has existed since KVM first started tracking\ninvalid roots in 2008 (commit 2e53d63acba7, \"KVM: MMU: ignore zapped root\npagetables\"), but the true badness only came along in 2020 (Linux 5.9)\nwith the invariant that invalid shadow pages can\u0027t be on the list of\nactive pages.\n\nNote #2, inheriting role.invalid when creating child shadow pages is also\nfar from ideal; that flaw will be addressed separately."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable shadow-MMU page-fault path is reached via local KVM_RUN handling of guest EPT/shadow faults (and nested EPT via paging_tmpl), not by network or adjacent-radio packets.\nAC:L - An attacker who can run nested or shadow-MMU guests controls MMU pressure (heavy nested mappings and/or KVM_SET_NR_MMU_PAGES) and concurrent faults so reclaim zaps an in-use root during make_mmu_pages_available; no attacker-uncontrollable condition is required.\nPR:L - Exploitation needs /dev/kvm access or a nested-capable guest on the host, privileges commonly available to kvm-group users or cloud tenants, not real init-namespace root or CAP_SYS_ADMIN on the create/run path.\nUI:N - Once the attacker can run the guest, they trigger reclaim and page faults entirely through their own vCPU activity with no action by another user.\nS:C - Guest-controlled faults corrupt host KVM MMU state (invalid shadow pages on active_mmu_pages and subsequent list handling), crossing the guest-to-host virtualization boundary into the host kernel authority.\nC:H - Invalid children on active_mmu_pages break zap accounting assumptions so later prepare_zap list_add on still-linked entries corrupts kernel lists, a memory-corruption primitive that can be leveraged for arbitrary host reads.\nI:H - The same active-list invariant break and linked-list corruption in host MMU teardown/reclaim paths yield writable host corruption suitable for control-flow or structure hijacking, not merely a benign accounting glitch.\nA:H - WARN_ON_ONCE skips, infinite zap loops, list corruption, and host oops/hangs are reachable when invalid shadow pages remain on active_mmu_pages, causing host and co-located VM denial of service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-27T12:39:43.193Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/62ef67af1878fa2cd066642f2f59e33ade95f637"
        },
        {
          "url": "https://git.kernel.org/stable/c/65c4f7a1028cf01a93a2762d679c289810ede990"
        },
        {
          "url": "https://git.kernel.org/stable/c/35e77467610c4a37cb0ff54ee56b85f73b1f5700"
        },
        {
          "url": "https://git.kernel.org/stable/c/0026dbb7de8ea76e97d6edf42fc3cc084564e2bf"
        },
        {
          "url": "https://git.kernel.org/stable/c/f3477a6a4164f15287444eda685b5f6405dbd1e5"
        },
        {
          "url": "https://git.kernel.org/stable/c/bce0d3c26e2c761a4bf43c8949f333fc7374eb2d"
        },
        {
          "url": "https://git.kernel.org/stable/c/2abd5287f08319fa35764566b15c6e22cb1068db"
        },
        {
          "url": "https://github.com/V4bel/Zapscape"
        }
      ],
      "title": "KVM: x86: Check for invalid/obsolete root *after* making MMU pages available",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64561",
    "datePublished": "2026-08-04T06:23:21.094Z",
    "dateReserved": "2026-07-19T15:36:31.796Z",
    "dateUpdated": "2026-08-27T12:39:43.193Z",
    "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.

Detection rules are retrieved from Rulezet.

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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.

Action not permitted

OESA-2026-3709 (CVE-2026-64561)

CVE-2026-64561 (GCVE-0-2026-64561)

Tags

Sightings

Nomenclature

Related by attack behaviour