CVE-2026-46317 (GCVE-0-2026-46317)

Vulnerability from cvelistv5 – Published: 2026-06-09 11:52 – Updated: 2026-06-09 11:52
VLAI
Title
KVM: arm64: Reassign nested_mmus array behind mmu_lock
Summary
In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Reassign nested_mmus array behind mmu_lock kvm->arch.nested_mmus[] is walked under kvm->mmu_lock, including from the MMU notifier path (kvm_unmap_gfn_range() -> kvm_nested_s2_unmap()), which can run at any time. kvm_vcpu_init_nested() reallocates the array and frees the old buffer while holding only kvm->arch.config_lock, so such a walker can reference the freed array. Allocate the new array outside of mmu_lock, as the allocation can sleep. Under the lock, copy the existing entries, fix up the back pointers and reassign the array. Free the old buffer after dropping the lock, as kvfree() can sleep as well.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 4f128f8e1aaac189f83d0f828bcdb2986d8d2e51 , < 918450ad6010df6ecd2efde12a1409e011da22d6 (git)
Affected: 4f128f8e1aaac189f83d0f828bcdb2986d8d2e51 , < 4424dbcb06d68e34e51c019a5781a7dc00731971 (git)
Affected: 4f128f8e1aaac189f83d0f828bcdb2986d8d2e51 , < 70543358fa08e0f7cebc3447c3b70fe97ad7aaa8 (git)
Create a notification for this product.
Linux Linux Affected: 6.11
Unaffected: 0 , < 6.11 (semver)
Unaffected: 6.18.35 , ≤ 6.18.* (semver)
Unaffected: 7.0.12 , ≤ 7.0.* (semver)
Unaffected: 7.1-rc7 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/kvm/nested.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "918450ad6010df6ecd2efde12a1409e011da22d6",
              "status": "affected",
              "version": "4f128f8e1aaac189f83d0f828bcdb2986d8d2e51",
              "versionType": "git"
            },
            {
              "lessThan": "4424dbcb06d68e34e51c019a5781a7dc00731971",
              "status": "affected",
              "version": "4f128f8e1aaac189f83d0f828bcdb2986d8d2e51",
              "versionType": "git"
            },
            {
              "lessThan": "70543358fa08e0f7cebc3447c3b70fe97ad7aaa8",
              "status": "affected",
              "version": "4f128f8e1aaac189f83d0f828bcdb2986d8d2e51",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/kvm/nested.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.11"
            },
            {
              "lessThan": "6.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.35",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1-rc7",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.35",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.12",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1-rc7",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: Reassign nested_mmus array behind mmu_lock\n\nkvm-\u003earch.nested_mmus[] is walked under kvm-\u003emmu_lock, including from the\nMMU notifier path (kvm_unmap_gfn_range() -\u003e kvm_nested_s2_unmap()), which\ncan run at any time. kvm_vcpu_init_nested() reallocates the array and frees\nthe old buffer while holding only kvm-\u003earch.config_lock, so such a walker\ncan reference the freed array.\n\nAllocate the new array outside of mmu_lock, as the allocation can sleep.\nUnder the lock, copy the existing entries, fix up the back pointers and\nreassign the array. Free the old buffer after dropping the lock, as\nkvfree() can sleep as well."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-09T11:52:30.333Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/918450ad6010df6ecd2efde12a1409e011da22d6"
        },
        {
          "url": "https://git.kernel.org/stable/c/4424dbcb06d68e34e51c019a5781a7dc00731971"
        },
        {
          "url": "https://git.kernel.org/stable/c/70543358fa08e0f7cebc3447c3b70fe97ad7aaa8"
        }
      ],
      "title": "KVM: arm64: Reassign nested_mmus array behind mmu_lock",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46317",
    "datePublished": "2026-06-09T11:52:30.333Z",
    "dateReserved": "2026-05-13T15:03:33.112Z",
    "dateUpdated": "2026-06-09T11:52:30.333Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-46317",
      "date": "2026-06-10",
      "epss": "0.00017",
      "percentile": "0.04236"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-46317\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-09T13:16:37.000\",\"lastModified\":\"2026-06-09T13:16:37.000\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nKVM: arm64: Reassign nested_mmus array behind mmu_lock\\n\\nkvm-\u003earch.nested_mmus[] is walked under kvm-\u003emmu_lock, including from the\\nMMU notifier path (kvm_unmap_gfn_range() -\u003e kvm_nested_s2_unmap()), which\\ncan run at any time. kvm_vcpu_init_nested() reallocates the array and frees\\nthe old buffer while holding only kvm-\u003earch.config_lock, so such a walker\\ncan reference the freed array.\\n\\nAllocate the new array outside of mmu_lock, as the allocation can sleep.\\nUnder the lock, copy the existing entries, fix up the back pointers and\\nreassign the array. Free the old buffer after dropping the lock, as\\nkvfree() can sleep as well.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4424dbcb06d68e34e51c019a5781a7dc00731971\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/70543358fa08e0f7cebc3447c3b70fe97ad7aaa8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/918450ad6010df6ecd2efde12a1409e011da22d6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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.