7.1

CVE-2026-64284

KVM: x86: Ensure vendor's exit handler runs before fastpath userspace exits

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

KVM: x86: Ensure vendor's exit handler runs before fastpath userspace exits

Move the handling of fastpath userspace exits into vendor code to ensure
KVM runs vendor specific operations that need to run before userspace gains
control of the vCPU.  E.g. for VMX (and soon to be for SVM as well), KVM
needs to flush the PML buffer prior to exiting to userspace, otherwise any
memory written by the final KVM_RUN might never be flagged as dirty.

Note, waiting to snapshot CR0 and CR3 until svm_handle_exit() is flawed in
general, as that risks consuming stale state in a fastpath handler.  That
will be addressed in a future change.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 6.12 < 6.12.96
Linux ≫ Linux Kernel Version >= 6.13 < 6.18.39
Linux ≫ Linux Kernel Version >= 6.19 < 7.1.4
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.12% 0.025
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
416baaa9-dc9f-4396-8d5f-8c081fb06d67 7.1 1.8 5.2
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition

The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check.

https://git.kernel.org/stable/c/b3436d9b9b1affe1c3191ac9831308923f5f03c3
Patch
https://git.kernel.org/stable/c/4ad73ef0e7966ecfe67de0060537b4cb14d9acd4
Patch
https://git.kernel.org/stable/c/f2ca2b5326211bd38490f0497eb583721ce0bbc0
Patch
https://git.kernel.org/stable/c/0ffedf43910e44b76c2c1db4e9fbf12b268190c1
Patch