Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: KVM: nSVM: Raise #UD if unhandled VMMCALL isn't intercepted by L1 Explicitly synthesize a #UD for VMMCALL if L2 is active, L1 does NOT want to intercept VMMCALL, nested_svm_l2_tlb_flush_enabled() is true, and the hypercall is something other than one of the supported Hyper-V hypercalls. When all of the above conditions are met, KVM will intercept VMMCALL but never forward it to L1, i.e. will let L2 make hypercalls as if it were L1. The TLFS says a whole lot of nothing about this scenario, so go with the architectural behavior, which says that VMMCALL #UDs if it's not intercepted. Opportunistically do a 2-for-1 stub trade by stub-ifying the new API instead of the helpers it uses. The last remaining "single" stub will soon be dropped as well. [sean: rewrite changelog and comment, tag for stable, remove defunct stubs]
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.2, < 6.12.86 |
References
- https://git.kernel.org/stable/c/009c0f726abeaa67aad1d96b883bdce01d405ce2Patch
- https://git.kernel.org/stable/c/5fb4a5f361565f5b629d8a8fe5288ce8463c5727Patch
- https://git.kernel.org/stable/c/924d721fae95687acedbaf624a094ed0e8b67104Patch
- https://git.kernel.org/stable/c/c36991c6f8d2ab56ee67aff04e3c357f45cfc76cPatch
FAQ
What is CVE-2026-46076?
CVE-2026-46076 is a vulnerability with a CVSS score of 7.9 (HIGH). In the Linux kernel, the following vulnerability has been resolved: KVM: nSVM: Raise #UD if unhandled VMMCALL isn't intercepted by L1 Explicitly synthesize a #UD for VMMCALL if L2 is active, L1 does...
How severe is CVE-2026-46076?
CVE-2026-46076 has been rated HIGH with a CVSS base score of 7.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-46076?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.