High severity · published May 6, 2026
CVE-2026-43133
KVM: nSVM: Always use vmcb01 in VMLOAD/VMSAVE emulation
7.9
CVSS
0.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 3% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
5.13 before 5.15.202; 5.16 before 6.1.165; 6.2 before 6.6.128; 6.7 before 6.12.75; 6.13 before 6.18.16; 6.19 before 6.19.6 · source: NVD
LI
Linux · Linux
cc3ed80ae69f454c3d904af9f65394a540099723 before 10063e1251c1485034a018236080792ad083dcc5; cc3ed80ae69f454c3d904af9f65394a540099723 before c3b7015000988ba35ecd5648f4b2283960f00543; cc3ed80ae69f454c3d904af9f65394a540099723 before 3880e331b0b31d0d5d3702b124f6c93539cd478a; cc3ed80ae69f454c3d904af9f65394a540099723 before fce2fd4a2ca05670a91015aacccf96a1c26268fd; cc3ed80ae69f454c3d904af9f65394a540099723 before d464cf1ed900d47c85393d40b00017b6adfc2e6c; cc3ed80ae69f454c3d904af9f65394a540099723 before 0004ecb798b30e90d7ebfe74efae2d9423315a64; +2 more · source: vendor
RH
Red Hat Enterprise Linux 10 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 8 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 9 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat OpenShift Container Platform 4 · Red Hat
All versions, or not specified · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-43133
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-43133
Patch
https://git.kernel.org/stable/c/0004ecb798b30e90d7ebfe74efae2d9423315a64
Patch
https://git.kernel.org/stable/c/10063e1251c1485034a018236080792ad083dcc5
Patch
https://git.kernel.org/stable/c/127ccae2c185f62e6ecb4bf24f9cb307e9b9c619
Patch
https://git.kernel.org/stable/c/3880e331b0b31d0d5d3702b124f6c93539cd478a
Patch
https://git.kernel.org/stable/c/c3b7015000988ba35ecd5648f4b2283960f00543
Patch
https://git.kernel.org/stable/c/d464cf1ed900d47c85393d40b00017b6adfc2e6c
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