Riskcovery

CVE-2026-43133

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

State
Published
Severity
7.9 High
Published
May 6, 2026
Updated
Oct 19, 2026
Reserved
May 1, 2026

Read the record on cve.org

Description

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.

Scores

CVSSScoreVectorSource
3.17.9 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:HLinux
3.17.9 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:Hredhat-SADP

Weaknesses

  • CWE-628 Function Call with Incorrectly Specified Arguments
  • CWE-754 Improper Check for Unusual or Exceptional Conditions

Affected Products

ProductVersions
LinuxLinux
  • cc3ed80ae69f454c3d904af9f65394a540099723 to before 10063e1251c1485034a018236080792ad083dcc5Affected
  • cc3ed80ae69f454c3d904af9f65394a540099723 to before c3b7015000988ba35ecd5648f4b2283960f00543Affected
  • cc3ed80ae69f454c3d904af9f65394a540099723 to before 3880e331b0b31d0d5d3702b124f6c93539cd478aAffected
  • cc3ed80ae69f454c3d904af9f65394a540099723 to before fce2fd4a2ca05670a91015aacccf96a1c26268fdAffected
  • cc3ed80ae69f454c3d904af9f65394a540099723 to before d464cf1ed900d47c85393d40b00017b6adfc2e6cAffected
  • cc3ed80ae69f454c3d904af9f65394a540099723 to before 0004ecb798b30e90d7ebfe74efae2d9423315a64Affected
  • cc3ed80ae69f454c3d904af9f65394a540099723 to before 127ccae2c185f62e6ecb4bf24f9cb307e9b9c619Affected
LinuxLinux
  • 5.13Affected
  • before 5.13Not affected
  • 5.15.202 through 5.15.*Not affected
  • 6.1.165 through 6.1.*Not affected
  • 6.6.128 through 6.6.*Not affected
  • 6.12.75 through 6.12.*Not affected
  • 6.18.16 through 6.18.*Not affected
  • 6.19.6 through 6.19.*Not affected
  • 7.0 and laterNot affected

References

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