CVE-2022-49932None▾ SunlitIn the Linux kernel, the following vulnerability has been resolved: KVM: VMX: Do _all_ initialization before exposing /dev/kvm to userspace Call kvm_init() only after _all_ setup is complete, as kvm_init() exposes /dev/kvm to userspace…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · 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.
Exploit-prediction probability, daily snapshots since Nov 5.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
In the Linux kernel, the following vulnerability has been resolved:
KVM: VMX: Do all initialization before exposing /dev/kvm to userspace
Call kvm_init() only after all setup is complete, as kvm_init() exposes /dev/kvm to userspace and thus allows userspace to create VMs (and call other ioctls). E.g. KVM will encounter a NULL pointer when attempting to add a vCPU to the per-CPU loaded_vmcss_on_cpu list if userspace is able to create a VM before vmx_init() configures said list.
BUG: kernel NULL pointer dereference, address: 0000000000000008 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 0 P4D 0 Oops: 0002 [#1] SMP CPU: 6 PID: 1143 Comm: stable Not tainted 6.0.0-rc7+ #988 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 RIP: 0010:vmx_vcpu_load_vmcs+0x68/0x230 [kvm_intel] <TASK> vmx_vcpu_load+0x16/0x60 [kvm_intel] kvm_arch_vcpu_load+0x32/0x1f0 [kvm] vcpu_load+0x2f/0x40 [kvm] kvm_arch_vcpu_create+0x231/0x310 [kvm] kvm_vm_ioctl+0x79f/0xe10 [kvm] ? handle_mm_fault+0xb1/0x220 __x64_sys_ioctl+0x80/0xb0 do_syscall_64+0x2b/0x50 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7f5a6b05743b </TASK> Modules linked in: vhost_net vhost vhost_iotlb tap kvm_intel(+) kvm irqbypass
Linux >= dbef2808af6c594922fe32833b30f55f35e9da6d < e136e969d268b9b89329c816c002e53f60e82985Linux >= dbef2808af6c594922fe32833b30f55f35e9da6d < e28533c08023c4b319b7f2cd77f3f7c9204eb517Linux >= dbef2808af6c594922fe32833b30f55f35e9da6d < e32b120071ea114efc0b4ddd439547750b85f618Linux b2f7d0adc1260fa33ff3e992d18ff15873e68a67Linux 2c0bf2560ca18abe1451db23b8ef8700c67cc44fLinux f9971a898a815c2a6cce2932e91a576b28ed4cceLinux 40888c31aca3a46f266f1f121679f8e1982df085Linux cd3f438fbb9cb60da32dd2b665f7dc9baba1c4adLinux e35a2dc8c7f664ae8a9cc46d19985dc79bfc1083Linux >= 4.9.220 < 4.10Linux >= 4.14.177 < 4.15Linux >= 4.19.116 < 4.20Linux >= 5.4.33 < 5.5Linux >= 5.5.18 < 5.6Linux >= 5.6.5 < 5.7Linux 5.7Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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