{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Acquire kvm->srcu when handling KVM_SET_VCPU_EVENTS\n\nGrab kvm->srcu when processing KVM_SET_VCPU_EVENTS, as KVM will forcibly\nleave nested VMX/SVM if SMM mode is being toggled, and leaving nested VMX\nreads guest memory.\n\nNote, kvm_vcpu_ioctl_x86_set_vcpu_events() can also be called from KVM_RUN\nvia sync_regs(), which already holds SRCU.  I.e. trying to precisely use\nkvm_vcpu_srcu_read_lock() around the problematic SMM code would cause\nproblems.  Acquiring SRCU isn't all that expensive, so for simplicity,\ngrab it unconditionally for KVM_SET_VCPU_EVENTS.\n\n =============================\n WARNING: suspicious RCU usage\n 6.10.0-rc7-332d2c1d713e-next-vm #552 Not tainted\n -----------------------------\n include/linux/kvm_host.h:1027 suspicious rcu_dereference_check() usage!\n\n other info that might help us debug this:\n\n rcu_scheduler_active = 2, debug_locks = 1\n 1 lock held by repro/1071:\n  #0: ffff88811e424430 (&vcpu->mutex){+.+.}-{3:3}, at: kvm_vcpu_ioctl+0x7d/0x970 [kvm]\n\n stack backtrace:\n CPU: 15 PID: 1071 Comm: repro Not tainted 6.10.0-rc7-332d2c1d713e-next-vm #552\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\n Call Trace:\n  <TASK>\n  dump_stack_lvl+0x7f/0x90\n  lockdep_rcu_suspicious+0x13f/0x1a0\n  kvm_vcpu_gfn_to_memslot+0x168/0x190 [kvm]\n  kvm_vcpu_read_guest+0x3e/0x90 [kvm]\n  nested_vmx_load_msr+0x6b/0x1d0 [kvm_intel]\n  load_vmcs12_host_state+0x432/0xb40 [kvm_intel]\n  vmx_leave_nested+0x30/0x40 [kvm_intel]\n  kvm_vcpu_ioctl_x86_set_vcpu_events+0x15d/0x2b0 [kvm]\n  kvm_arch_vcpu_ioctl+0x1107/0x1750 [kvm]\n  ? mark_held_locks+0x49/0x70\n  ? kvm_vcpu_ioctl+0x7d/0x970 [kvm]\n  ? kvm_vcpu_ioctl+0x497/0x970 [kvm]\n  kvm_vcpu_ioctl+0x497/0x970 [kvm]\n  ? lock_acquire+0xba/0x2d0\n  ? find_held_lock+0x2b/0x80\n  ? do_user_addr_fault+0x40c/0x6f0\n  ? lock_release+0xb7/0x270\n  __x64_sys_ioctl+0x82/0xb0\n  do_syscall_64+0x6c/0x170\n  entry_SYSCALL_64_after_hwframe+0x4b/0x53\n RIP: 0033:0x7ff11eb1b539\n  </TASK>"
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "arch/x86/kvm/x86.c"
               ],
               "versions": [
                  {
                     "version": "f7e570780efc",
                     "lessThan": "fa297c33faef",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "f7e570780efc",
                     "lessThan": "939375737b5a",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "f7e570780efc",
                     "lessThan": "ecdbe8ac86fb",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "f7e570780efc",
                     "lessThan": "4bcdd831d9d0",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "affected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "arch/x86/kvm/x86.c"
               ],
               "versions": [
                  {
                     "version": "5.17",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "5.17",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.1.110",
                     "lessThanOrEqual": "6.1.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.6.51",
                     "lessThanOrEqual": "6.6.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.10.10",
                     "lessThanOrEqual": "6.10.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.11",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/fa297c33faefe51e10244e8a378837fca4963228"
            },
            {
               "url": "https://git.kernel.org/stable/c/939375737b5a0b1bf9b1e75129054e11bc9ca65e"
            },
            {
               "url": "https://git.kernel.org/stable/c/ecdbe8ac86fb5538ccc623a41f88ec96c7168ab9"
            },
            {
               "url": "https://git.kernel.org/stable/c/4bcdd831d9d01e0fb64faea50732b59b2ee88da1"
            }
         ],
         "title": "KVM: x86: Acquire kvm->srcu when handling KVM_SET_VCPU_EVENTS",
         "x_generator": {
            "engine": "bippy-c9c4e1df01b2"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2024-46830",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}