CVE-2026-64284KVM: x86: Ensure vendor's exit handler runs before fastpath userspace exits
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.1 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from f7f39c50edb9d336274371953275e0d3503b9b75 before b3436d9b9b1affe1c3191ac9831308923f5f03c3; from f7f39c50edb9d336274371953275e0d3503b9b75 before 4ad73ef0e7966ecfe67de0060537b4cb14d9acd4; from f7f39c50edb9d336274371953275e0d3503b9b75 before f2ca2b5326211bd38490f0497eb583721ce0bbc0; from f7f39c50edb9d336274371953275e0d3503b9b75 before 0ffedf43910e44b76c2c1db4e9fbf12b268190c1 | CNA record |
linux linux_kernel linux:linux_kernel | from 6.12 before 6.12.96; from 6.13 before 6.18.39; from 6.19 before 7.1.4 | NVD |
References
- https://git.kernel.org/stable/c/b3436d9b9b1affe1c3191ac9831308923f5f03c3patch
- https://git.kernel.org/stable/c/4ad73ef0e7966ecfe67de0060537b4cb14d9acd4patch
- https://git.kernel.org/stable/c/f2ca2b5326211bd38490f0497eb583721ce0bbc0patch
- https://git.kernel.org/stable/c/0ffedf43910e44b76c2c1db4e9fbf12b268190c1patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.