CVE-2025-40300Medium· 5.5▾ SunlitIn the Linux kernel, the following vulnerability has been resolved: x86/vmscape: Add conditional IBPB mitigation VMSCAPE is a vulnerability that exploits insufficient branch predictor isolation between a guest and a userspace hyperviso…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 30.3 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Sep 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.3%
Last analysed / modified upstream
— → 5.5
none → medium
0.3% → 0.4%
In the Linux kernel, the following vulnerability has been resolved:
x86/vmscape: Add conditional IBPB mitigation
VMSCAPE is a vulnerability that exploits insufficient branch predictor isolation between a guest and a userspace hypervisor (like QEMU). Existing mitigations already protect kernel/KVM from a malicious guest. Userspace can additionally be protected by flushing the branch predictors after a VMexit.
Since it is the userspace that consumes the poisoned branch predictors, conditionally issue an IBPB after a VMexit and before returning to userspace. Workloads that frequently switch between hypervisor and userspace will incur the most overhead from the new IBPB.
This new IBPB is not integrated with the existing IBPB sites. For instance, a task can use the existing speculation control prctl() to get an IBPB at context switch time. With this implementation, the IBPB is doubled up: one at context switch and another before running userspace.
The intent is to integrate and optimize these cases post-embargo.
[ dhansen: elaborate on suboptimal IBPB solution ]
linux_kernel >= 3.16.57, < 3.17linux_kernel >= 4.4.168, < 4.5linux_kernel >= 4.16, < 5.10.244linux_kernel >= 5.11, < 5.15.193linux_kernel >= 5.16, < 6.1.152linux_kernel >= 6.2, < 6.6.106linux_kernel >= 6.7, < 6.12.47linux_kernel >= 6.13, < 6.16.7linux_kernel = 6.17debian_linux = 11.0Upgrade past the affected range:
linux_kernel 6.16.7Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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