CVE-2026-43315 (GCVE-0-2026-43315)

Vulnerability from cvelistv5 – Published: 2026-05-08 13:11 – Updated: 2026-05-11 22:22
VLAI
Title
KVM: nSVM: Remove a user-triggerable WARN on nested_svm_load_cr3() succeeding
Summary
In the Linux kernel, the following vulnerability has been resolved: KVM: nSVM: Remove a user-triggerable WARN on nested_svm_load_cr3() succeeding Drop the WARN in svm_set_nested_state() on nested_svm_load_cr3() failing as it is trivially easy to trigger from userspace by modifying CPUID after loading CR3. E.g. modifying the state restoration selftest like so: --- tools/testing/selftests/kvm/x86/state_test.c +++ tools/testing/selftests/kvm/x86/state_test.c @@ -280,7 +280,16 @@ int main(int argc, char *argv[]) /* Restore state in a new VM. */ vcpu = vm_recreate_with_one_vcpu(vm); - vcpu_load_state(vcpu, state); + + if (stage == 4) { + state->sregs.cr3 = BIT(44); + vcpu_load_state(vcpu, state); + + vcpu_set_cpuid_property(vcpu, X86_PROPERTY_MAX_PHY_ADDR, 36); + __vcpu_nested_state_set(vcpu, &state->nested); + } else { + vcpu_load_state(vcpu, state); + } /* * Restore XSAVE state in a dummy vCPU, first without doing generates: WARNING: CPU: 30 PID: 938 at arch/x86/kvm/svm/nested.c:1877 svm_set_nested_state+0x34a/0x360 [kvm_amd] Modules linked in: kvm_amd kvm irqbypass [last unloaded: kvm] CPU: 30 UID: 1000 PID: 938 Comm: state_test Tainted: G W 6.18.0-rc7-58e10b63777d-next-vm Tainted: [W]=WARN Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 RIP: 0010:svm_set_nested_state+0x34a/0x360 [kvm_amd] Call Trace: <TASK> kvm_arch_vcpu_ioctl+0xf33/0x1700 [kvm] kvm_vcpu_ioctl+0x4e6/0x8f0 [kvm] __x64_sys_ioctl+0x8f/0xd0 do_syscall_64+0x61/0xad0 entry_SYSCALL_64_after_hwframe+0x4b/0x53 Simply delete the WARN instead of trying to prevent userspace from shoving "illegal" state into CR3. For better or worse, KVM's ABI allows userspace to set CPUID after SREGS, and vice versa, and KVM is very permissive when it comes to guest CPUID. I.e. attempting to enforce the virtual CPU model when setting CPUID could break userspace. Given that the WARN doesn't provide any meaningful protection for KVM or benefit for userspace, simply drop it even though the odds of breaking userspace are minuscule. Opportunistically delete a spurious newline.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b222b0b88162bdef4eceb12a79d5edbbdb23dbfd , < 155ec243ef726f4bc49536fa0bfb565dc011ab17 (git)
Affected: b222b0b88162bdef4eceb12a79d5edbbdb23dbfd , < 580ea57840864d40e019bc13fd26afdc8d510a2f (git)
Affected: b222b0b88162bdef4eceb12a79d5edbbdb23dbfd , < deb8f6dfd31d94b18dbeeaa8c01fbec5fc70fd2b (git)
Affected: b222b0b88162bdef4eceb12a79d5edbbdb23dbfd , < ce904c8a5bbe697eae0f7e34b07095bd7a6dee19 (git)
Affected: b222b0b88162bdef4eceb12a79d5edbbdb23dbfd , < 969e5e13ff5c18603f21d1f9f64ec9194e141ac0 (git)
Affected: b222b0b88162bdef4eceb12a79d5edbbdb23dbfd , < ebb2ab4f1c87d6b52776292cf7dc16aea48e95f8 (git)
Affected: b222b0b88162bdef4eceb12a79d5edbbdb23dbfd , < fc3ba56385d03501eb582e4b86691ba378e556f9 (git)
Create a notification for this product.
Linux Linux Affected: 5.14
Unaffected: 0 , < 5.14 (semver)
Unaffected: 5.15.202 , ≤ 5.15.* (semver)
Unaffected: 6.1.165 , ≤ 6.1.* (semver)
Unaffected: 6.6.128 , ≤ 6.6.* (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.16 , ≤ 6.18.* (semver)
Unaffected: 6.19.6 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (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/x86/kvm/svm/nested.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "155ec243ef726f4bc49536fa0bfb565dc011ab17",
              "status": "affected",
              "version": "b222b0b88162bdef4eceb12a79d5edbbdb23dbfd",
              "versionType": "git"
            },
            {
              "lessThan": "580ea57840864d40e019bc13fd26afdc8d510a2f",
              "status": "affected",
              "version": "b222b0b88162bdef4eceb12a79d5edbbdb23dbfd",
              "versionType": "git"
            },
            {
              "lessThan": "deb8f6dfd31d94b18dbeeaa8c01fbec5fc70fd2b",
              "status": "affected",
              "version": "b222b0b88162bdef4eceb12a79d5edbbdb23dbfd",
              "versionType": "git"
            },
            {
              "lessThan": "ce904c8a5bbe697eae0f7e34b07095bd7a6dee19",
              "status": "affected",
              "version": "b222b0b88162bdef4eceb12a79d5edbbdb23dbfd",
              "versionType": "git"
            },
            {
              "lessThan": "969e5e13ff5c18603f21d1f9f64ec9194e141ac0",
              "status": "affected",
              "version": "b222b0b88162bdef4eceb12a79d5edbbdb23dbfd",
              "versionType": "git"
            },
            {
              "lessThan": "ebb2ab4f1c87d6b52776292cf7dc16aea48e95f8",
              "status": "affected",
              "version": "b222b0b88162bdef4eceb12a79d5edbbdb23dbfd",
              "versionType": "git"
            },
            {
              "lessThan": "fc3ba56385d03501eb582e4b86691ba378e556f9",
              "status": "affected",
              "version": "b222b0b88162bdef4eceb12a79d5edbbdb23dbfd",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/svm/nested.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.14"
            },
            {
              "lessThan": "5.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.202",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.165",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.128",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.75",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.202",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.165",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.128",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.75",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.16",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.6",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: nSVM: Remove a user-triggerable WARN on nested_svm_load_cr3() succeeding\n\nDrop the WARN in svm_set_nested_state() on nested_svm_load_cr3() failing\nas it is trivially easy to trigger from userspace by modifying CPUID after\nloading CR3.  E.g. modifying the state restoration selftest like so:\n\n  --- tools/testing/selftests/kvm/x86/state_test.c\n  +++ tools/testing/selftests/kvm/x86/state_test.c\n  @@ -280,7 +280,16 @@ int main(int argc, char *argv[])\n\n                 /* Restore state in a new VM.  */\n                  vcpu = vm_recreate_with_one_vcpu(vm);\n  -               vcpu_load_state(vcpu, state);\n  +\n  +               if (stage == 4) {\n  +                       state-\u003esregs.cr3 = BIT(44);\n  +                       vcpu_load_state(vcpu, state);\n  +\n  +                       vcpu_set_cpuid_property(vcpu, X86_PROPERTY_MAX_PHY_ADDR, 36);\n  +                       __vcpu_nested_state_set(vcpu, \u0026state-\u003enested);\n  +               } else {\n  +                       vcpu_load_state(vcpu, state);\n  +               }\n\n                  /*\n                   * Restore XSAVE state in a dummy vCPU, first without doing\n\ngenerates:\n\n  WARNING: CPU: 30 PID: 938 at arch/x86/kvm/svm/nested.c:1877 svm_set_nested_state+0x34a/0x360 [kvm_amd]\n  Modules linked in: kvm_amd kvm irqbypass [last unloaded: kvm]\n  CPU: 30 UID: 1000 PID: 938 Comm: state_test Tainted: G        W           6.18.0-rc7-58e10b63777d-next-vm\n  Tainted: [W]=WARN\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\n  RIP: 0010:svm_set_nested_state+0x34a/0x360 [kvm_amd]\n  Call Trace:\n   \u003cTASK\u003e\n   kvm_arch_vcpu_ioctl+0xf33/0x1700 [kvm]\n   kvm_vcpu_ioctl+0x4e6/0x8f0 [kvm]\n   __x64_sys_ioctl+0x8f/0xd0\n   do_syscall_64+0x61/0xad0\n   entry_SYSCALL_64_after_hwframe+0x4b/0x53\n\nSimply delete the WARN instead of trying to prevent userspace from shoving\n\"illegal\" state into CR3.  For better or worse, KVM\u0027s ABI allows userspace\nto set CPUID after SREGS, and vice versa, and KVM is very permissive when\nit comes to guest CPUID.  I.e. attempting to enforce the virtual CPU model\nwhen setting CPUID could break userspace.  Given that the WARN doesn\u0027t\nprovide any meaningful protection for KVM or benefit for userspace, simply\ndrop it even though the odds of breaking userspace are minuscule.\n\nOpportunistically delete a spurious newline."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:22:10.929Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/155ec243ef726f4bc49536fa0bfb565dc011ab17"
        },
        {
          "url": "https://git.kernel.org/stable/c/580ea57840864d40e019bc13fd26afdc8d510a2f"
        },
        {
          "url": "https://git.kernel.org/stable/c/deb8f6dfd31d94b18dbeeaa8c01fbec5fc70fd2b"
        },
        {
          "url": "https://git.kernel.org/stable/c/ce904c8a5bbe697eae0f7e34b07095bd7a6dee19"
        },
        {
          "url": "https://git.kernel.org/stable/c/969e5e13ff5c18603f21d1f9f64ec9194e141ac0"
        },
        {
          "url": "https://git.kernel.org/stable/c/ebb2ab4f1c87d6b52776292cf7dc16aea48e95f8"
        },
        {
          "url": "https://git.kernel.org/stable/c/fc3ba56385d03501eb582e4b86691ba378e556f9"
        }
      ],
      "title": "KVM: nSVM: Remove a user-triggerable WARN on nested_svm_load_cr3() succeeding",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43315",
    "datePublished": "2026-05-08T13:11:31.784Z",
    "dateReserved": "2026-05-01T14:12:56.001Z",
    "dateUpdated": "2026-05-11T22:22:10.929Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-43315",
      "date": "2026-05-28",
      "epss": "0.00013",
      "percentile": "0.0237"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-43315\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-08T14:16:39.977\",\"lastModified\":\"2026-05-15T17:04:18.160\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nKVM: nSVM: Remove a user-triggerable WARN on nested_svm_load_cr3() succeeding\\n\\nDrop the WARN in svm_set_nested_state() on nested_svm_load_cr3() failing\\nas it is trivially easy to trigger from userspace by modifying CPUID after\\nloading CR3.  E.g. modifying the state restoration selftest like so:\\n\\n  --- tools/testing/selftests/kvm/x86/state_test.c\\n  +++ tools/testing/selftests/kvm/x86/state_test.c\\n  @@ -280,7 +280,16 @@ int main(int argc, char *argv[])\\n\\n                 /* Restore state in a new VM.  */\\n                  vcpu = vm_recreate_with_one_vcpu(vm);\\n  -               vcpu_load_state(vcpu, state);\\n  +\\n  +               if (stage == 4) {\\n  +                       state-\u003esregs.cr3 = BIT(44);\\n  +                       vcpu_load_state(vcpu, state);\\n  +\\n  +                       vcpu_set_cpuid_property(vcpu, X86_PROPERTY_MAX_PHY_ADDR, 36);\\n  +                       __vcpu_nested_state_set(vcpu, \u0026state-\u003enested);\\n  +               } else {\\n  +                       vcpu_load_state(vcpu, state);\\n  +               }\\n\\n                  /*\\n                   * Restore XSAVE state in a dummy vCPU, first without doing\\n\\ngenerates:\\n\\n  WARNING: CPU: 30 PID: 938 at arch/x86/kvm/svm/nested.c:1877 svm_set_nested_state+0x34a/0x360 [kvm_amd]\\n  Modules linked in: kvm_amd kvm irqbypass [last unloaded: kvm]\\n  CPU: 30 UID: 1000 PID: 938 Comm: state_test Tainted: G        W           6.18.0-rc7-58e10b63777d-next-vm\\n  Tainted: [W]=WARN\\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\\n  RIP: 0010:svm_set_nested_state+0x34a/0x360 [kvm_amd]\\n  Call Trace:\\n   \u003cTASK\u003e\\n   kvm_arch_vcpu_ioctl+0xf33/0x1700 [kvm]\\n   kvm_vcpu_ioctl+0x4e6/0x8f0 [kvm]\\n   __x64_sys_ioctl+0x8f/0xd0\\n   do_syscall_64+0x61/0xad0\\n   entry_SYSCALL_64_after_hwframe+0x4b/0x53\\n\\nSimply delete the WARN instead of trying to prevent userspace from shoving\\n\\\"illegal\\\" state into CR3.  For better or worse, KVM\u0027s ABI allows userspace\\nto set CPUID after SREGS, and vice versa, and KVM is very permissive when\\nit comes to guest CPUID.  I.e. attempting to enforce the virtual CPU model\\nwhen setting CPUID could break userspace.  Given that the WARN doesn\u0027t\\nprovide any meaningful protection for KVM or benefit for userspace, simply\\ndrop it even though the odds of breaking userspace are minuscule.\\n\\nOpportunistically delete a spurious newline.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.14\",\"versionEndExcluding\":\"5.15.202\",\"matchCriteriaId\":\"073AF12C-E4C9-43A0-A31D-73F15E62199C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.165\",\"matchCriteriaId\":\"797C7F46-D0BE-4FB8-A502-C5EF8E6B6654\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.128\",\"matchCriteriaId\":\"851E9353-6C09-4CC9-877E-E09DB164A3C2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.75\",\"matchCriteriaId\":\"BCE16369-98ED-41CF-8995-DFDC10B288D2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.16\",\"matchCriteriaId\":\"B4B8CDA9-BADF-4CF5-8B3B-702DE8EEA40B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"6.19.6\",\"matchCriteriaId\":\"373EEEDA-FAA1-4FB4-B6ED-DB4DD99DBE67\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/155ec243ef726f4bc49536fa0bfb565dc011ab17\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/580ea57840864d40e019bc13fd26afdc8d510a2f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/969e5e13ff5c18603f21d1f9f64ec9194e141ac0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ce904c8a5bbe697eae0f7e34b07095bd7a6dee19\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/deb8f6dfd31d94b18dbeeaa8c01fbec5fc70fd2b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ebb2ab4f1c87d6b52776292cf7dc16aea48e95f8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/fc3ba56385d03501eb582e4b86691ba378e556f9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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.