In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
KVM: TDX: Reject concurrent change to CPUID entry count<\/p>\n
Reject KVM_TDX_INIT_VM if userspace changes cpuid.nent between the
\ninitial read and the subsequent copy of the initialization data.<\/p>\n
tdx_td_init() first reads user_data->cpuid.nent to size the flexible
\nkvm_tdx_init_vm copy. The copied structure also contains cpuid.nent,
\nand that field can differ from the value used to size the allocation if
\nuserspace modifies the input concurrently. setup_tdparams_cpuids() later
\npasses init_vm->cpuid.nent to kvm_find_cpuid_entry2(), which uses it as
\nthe array bound for the copied entries.<\/p>\n
Require the copied count to match the value used to size the allocation
\nso that CPUID parsing cannot access beyond the entries actually copied.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
KVM: TDX: Reject concurrent change to CPUID entry count<\/p>\n
Reject KVM_TDX_INIT_VM if userspace changes cpuid.nent between the
\ninitial<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-6901","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/6901","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=6901"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6901"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6901"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}