CVE-2022-50228: KVM: SVM: Don't BUG if userspace injects an interrupt with GIF=0
In the Linux kernel, the following vulnerability has been resolved:
KVM: SVM: Don't BUG if userspace injects an interrupt with GIF=0
Don't BUG/WARN on interrupt injection due to GIF being cleared, since it's trivial for userspace to force the situation via KVMSETVCPUEVENTS (even if having at least a WARN there would be correct for KVM internally generated injections).
kernel BUG at arch/x86/kvm/svm/svm.c:3386! invalid opcode: 0000 [#1] SMP CPU: 15 PID: 926 Comm: smmtest Not tainted 5.17.0-rc3+ #264 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 RIP: 0010:svminjectirq+0xab/0xb0 [kvmamd] Code: <0f> 0b 0f 1f 00 0f 1f 44 00 00 80 3d ac b3 01 00 00 55 48 89 f5 53 RSP: 0018:ffffc90000b37d88 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff88810a234ac0 RCX: 0000000000000006 RDX: 0000000000000000 RSI: ffffc90000b37df7 RDI: ffff88810a234ac0 RBP: ffffc90000b37df7 R08: ffff88810a1fa410 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff888109571000 R14: ffff88810a234ac0 R15: 0000000000000000 FS: 0000000001821380(0000) GS:ffff88846fdc0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f74fc550008 CR3: 000000010a6fe000 CR4: 0000000000350ea0 Call Trace: <TASK> injectpendingevent+0x2f7/0x4c0 [kvm] kvmarchvcpuioctlrun+0x791/0x17a0 [kvm] kvmvcpuioctl+0x26d/0x650 [kvm] x64sysioctl+0x82/0xb0 dosyscall64+0x3b/0xc0 entrySYSCALL64afterhwframe+0x44/0xae </TASK>
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2022-50228?
CVE-2022-50228 has been classified as moderate severity due to its impact on the Linux kernel's interrupt handling.
How do I fix CVE-2022-50228?
To fix CVE-2022-50228, update your Linux kernel to version 5.17.0 or later where the vulnerability has been addressed.
What versions of the Linux kernel are affected by CVE-2022-50228?
CVE-2022-50228 affects Linux kernel versions prior to 5.17.0.
What kind of attacks can CVE-2022-50228 facilitate?
CVE-2022-50228 could allow userspace applications to manipulate interrupt injection, potentially leading to escalated privileges.
Is my system vulnerable to CVE-2022-50228?
If you are running a version of the Linux kernel older than 5.17.0, your system is vulnerable to CVE-2022-50228.