Vulnerability-Lookup

GHSA-G9J5-V9RR-M845

Vulnerability from github – Published: 2026-05-06 12:30 – Updated: 2026-05-08 15:31

Details

In the Linux kernel, the following vulnerability has been resolved:

KVM: nSVM: Always use vmcb01 in VMLOAD/VMSAVE emulation

Commit cc3ed80ae69f ("KVM: nSVM: always use vmcb01 to for vmsave/vmload of guest state") made KVM always use vmcb01 for the fields controlled by VMSAVE/VMLOAD, but it missed updating the VMLOAD/VMSAVE emulation code to always use vmcb01.

As a result, if VMSAVE/VMLOAD is executed by an L2 guest and is not intercepted by L1, KVM will mistakenly use vmcb02. Always use vmcb01 instead of the current VMCB.

Severity ?

7.9 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-43133"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-06T12:16:30Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: nSVM: Always use vmcb01 in VMLOAD/VMSAVE emulation\n\nCommit cc3ed80ae69f (\"KVM: nSVM: always use vmcb01 to for vmsave/vmload\nof guest state\") made KVM always use vmcb01 for the fields controlled by\nVMSAVE/VMLOAD, but it missed updating the VMLOAD/VMSAVE emulation code\nto always use vmcb01.\n\nAs a result, if VMSAVE/VMLOAD is executed by an L2 guest and is not\nintercepted by L1, KVM will mistakenly use vmcb02. Always use vmcb01\ninstead of the current VMCB.",
  "id": "GHSA-g9j5-v9rr-m845",
  "modified": "2026-05-08T15:31:16Z",
  "published": "2026-05-06T12:30:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43133"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0004ecb798b30e90d7ebfe74efae2d9423315a64"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/10063e1251c1485034a018236080792ad083dcc5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/127ccae2c185f62e6ecb4bf24f9cb307e9b9c619"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3880e331b0b31d0d5d3702b124f6c93539cd478a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c3b7015000988ba35ecd5648f4b2283960f00543"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d464cf1ed900d47c85393d40b00017b6adfc2e6c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fce2fd4a2ca05670a91015aacccf96a1c26268fd"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-43133 (GCVE-0-2026-43133)

Vulnerability from cvelistv5 – Published: 2026-05-06 11:27 – Updated: 2026-05-11 22:18

Title

KVM: nSVM: Always use vmcb01 in VMLOAD/VMSAVE emulation

Summary

In the Linux kernel, the following vulnerability has been resolved: KVM: nSVM: Always use vmcb01 in VMLOAD/VMSAVE emulation Commit cc3ed80ae69f ("KVM: nSVM: always use vmcb01 to for vmsave/vmload of guest state") made KVM always use vmcb01 for the fields controlled by VMSAVE/VMLOAD, but it missed updating the VMLOAD/VMSAVE emulation code to always use vmcb01. As a result, if VMSAVE/VMLOAD is executed by an L2 guest and is not intercepted by L1, KVM will mistakenly use vmcb02. Always use vmcb01 instead of the current VMCB.

Severity ?

7.9 (High)


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

Assigner

Linux

References

7 references

URL	Tags
https://git.kernel.org/stable/c/10063e1251c148503…
https://git.kernel.org/stable/c/c3b7015000988ba35…
https://git.kernel.org/stable/c/3880e331b0b31d0d5…
https://git.kernel.org/stable/c/fce2fd4a2ca05670a…
https://git.kernel.org/stable/c/d464cf1ed900d47c8…
https://git.kernel.org/stable/c/0004ecb798b30e90d…
https://git.kernel.org/stable/c/127ccae2c185f62e6…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: cc3ed80ae69f454c3d904af9f65394a540099723 , < 10063e1251c1485034a018236080792ad083dcc5 (git) Affected: cc3ed80ae69f454c3d904af9f65394a540099723 , < c3b7015000988ba35ecd5648f4b2283960f00543 (git) Affected: cc3ed80ae69f454c3d904af9f65394a540099723 , < 3880e331b0b31d0d5d3702b124f6c93539cd478a (git) Affected: cc3ed80ae69f454c3d904af9f65394a540099723 , < fce2fd4a2ca05670a91015aacccf96a1c26268fd (git) Affected: cc3ed80ae69f454c3d904af9f65394a540099723 , < d464cf1ed900d47c85393d40b00017b6adfc2e6c (git) Affected: cc3ed80ae69f454c3d904af9f65394a540099723 , < 0004ecb798b30e90d7ebfe74efae2d9423315a64 (git) Affected: cc3ed80ae69f454c3d904af9f65394a540099723 , < 127ccae2c185f62e6ecb4bf24f9cb307e9b9c619 (git)
Linux	Linux	Affected: 5.13 Unaffected: 0 , < 5.13 (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)

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{
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        {
          "defaultStatus": "unaffected",
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          "programFiles": [
            "arch/x86/kvm/svm/svm.c"
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              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.1.165",
              "versionType": "semver"
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              "version": "6.6.128",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.75",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.18.16",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
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              "versionType": "original_commit_for_fix"
            }
          ]
        }
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          "nodes": [
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        }
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            "baseScore": 7.9,
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            "version": "3.1"
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      ],
      "title": "KVM: nSVM: Always use vmcb01 in VMLOAD/VMSAVE emulation",
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    "cveId": "CVE-2026-43133",
    "datePublished": "2026-05-06T11:27:20.882Z",
    "dateReserved": "2026-05-01T14:12:55.988Z",
    "dateUpdated": "2026-05-11T22:18:23.794Z",
    "state": "PUBLISHED"
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}

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.

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GHSA-G9J5-V9RR-M845

CVE-2026-43133 (GCVE-0-2026-43133)

Tags

Sightings

Nomenclature