DEBIAN-CVE-2023-53663

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Source
https://security-tracker.debian.org/tracker/CVE-2023-53663
Import Source
https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-53663.json
JSON Data
https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2023-53663
Upstream
Published
2025-10-07T16:15:50Z
Modified
2025-10-10T18:49:19.779608Z
Summary
[none]
Details

In the Linux kernel, the following vulnerability has been resolved: KVM: nSVM: Check instead of asserting on nested TSC scaling support Check for nested TSC scaling support on nested SVM VMRUN instead of asserting that TSC scaling is exposed to L1 if L1's MSRAMD64TSCRATIO has diverged from KVM's default. Userspace can trigger the WARN at will by writing the MSR and then updating guest CPUID to hide the feature (modifying guest CPUID is allowed anytime before KVMRUN). E.g. hacking KVM's statetest selftest to do vcpusetmsr(vcpu, MSRAMD64TSCRATIO, 0); vcpuclearcpuidfeature(vcpu, X86FEATURETSCRATEMSR); after restoring state in a new VM+vCPU yields an endless supply of: ------------[ cut here ]------------ WARNING: CPU: 164 PID: 62565 at arch/x86/kvm/svm/nested.c:699 nestedvmcb02preparecontrol+0x3d6/0x3f0 [kvmamd] Call Trace: <TASK> entersvmguestmode+0x114/0x560 [kvmamd] nestedsvmvmrun+0x260/0x330 [kvmamd] vmruninterception+0x29/0x30 [kvmamd] svminvokeexithandler+0x35/0x100 [kvmamd] svmhandleexit+0xe7/0x180 [kvmamd] kvmarchvcpuioctlrun+0x1eab/0x2570 [kvm] kvmvcpuioctl+0x4c9/0x5b0 [kvm] _sesysioctl+0x7a/0xc0 _x64sysioctl+0x21/0x30 dosyscall64+0x41/0x90 entrySYSCALL64after_hwframe+0x63/0xcd RIP: 0033:0x45ca1b Note, the nested #VMEXIT path has the same flaw, but needs a different fix and will be handled separately.

References

Affected packages

Debian:12 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
6.1.55-1

Affected versions

6.*

6.1.27-1
6.1.37-1
6.1.38-1
6.1.38-2~bpo11+1
6.1.38-2
6.1.38-3
6.1.38-4~bpo11+1
6.1.38-4
6.1.52-1
6.1.55-1~bpo11+1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:13 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
6.5.6-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Debian:14 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
6.5.6-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}