CVE-2026-46076High· 7.9▾ TwilightIn 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, neste…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 43.5 · likelihood 0 · 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. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.1%
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]
Linux >= 3f4a812edf5cb0a50e65fbdfafdb3e688da18f16 < 924d721fae95687acedbaf624a094ed0e8b67104Linux >= 3f4a812edf5cb0a50e65fbdfafdb3e688da18f16 < 009c0f726abeaa67aad1d96b883bdce01d405ce2Linux >= 3f4a812edf5cb0a50e65fbdfafdb3e688da18f16 < 5fb4a5f361565f5b629d8a8fe5288ce8463c5727Linux >= 3f4a812edf5cb0a50e65fbdfafdb3e688da18f16 < c36991c6f8d2ab56ee67aff04e3c357f45cfc76cLinux 6.2Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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