CVE-2026-31590
MediumCVSS 5.5Summary
W jądrze systemu Linux rozwiązano podatność dotyczącą KVM, która polegała na usunięciu ostrzeżenia (WARN) w funkcji sev_pin_memory() dla przypadków, gdy liczba stron (npages) przekraczała wartość typu int. Ostrzeżenie to mogło być łatwo wywołane z poziomu użytkownika poprzez odpowiednie manipulacje danymi.
Risk Assessment
Podatność ta może prowadzić do nieprzewidzianych zachowań systemu, co stwarza ryzyko dla stabilności i bezpieczeństwa maszyn wirtualnych. Możliwość wywołania ostrzeżenia z poziomu użytkownika może być wykorzystana do przeprowadzenia ataków na infrastrukturę wirtualizacyjną.
Recommendation
Zaleca się aktualizację jądra systemu Linux do najnowszej wersji, aby usunąć tę podatność oraz monitorowanie systemów wirtualizacyjnych pod kątem nieautoryzowanych działań użytkowników.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Drop WARN on large size for KVM_MEMORY_ENCRYPT_REG_REGION Drop the WARN in sev_pin_memory() on npages overflowing an int, as the WARN is comically trivially to trigger from userspace, e.g. by doing: struct kvm_enc_region range = { .addr = 0, .size = -1ul, }; __vm_ioctl(vm, KVM_MEMORY_ENCRYPT_REG_REGION, &range); Note, the checks in sev_mem_enc_register_region() that presumably exist to verify the incoming address+size are completely worthless, as both "addr" and "size" are u64s and SEV is 64-bit only, i.e. they _can't_ be greater than ULONG_MAX. That wart will be cleaned up in the near future. if (range->addr > ULONG_MAX || range->size > ULONG_MAX) return -EINVAL; Opportunistically add a comment to explain why the code calculates the number of pages the "hard" way, e.g. instead of just shifting @ulen.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS