{"cve":"CVE-2024-50114","nvd":{"published":"2024-11-05T18:15:14.630","modified":"2026-06-17T08:03:37.427","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: Unregister redistributor for failed vCPU creation\n\nAlex reports that syzkaller has managed to trigger a use-after-free when\ntearing down a VM:\n\n  BUG: KASAN: slab-use-after-free in kvm_put_kvm+0x300/0xe68 virt/kvm/kvm_main.c:5769\n  Read of size 8 at addr ffffff801c6890d0 by task syz.3.2219/10758\n\n  CPU: 3 UID: 0 PID: 10758 Comm: syz.3.2219 Not tainted 6.11.0-rc6-dirty #64\n  Hardware name: linux,dummy-virt (DT)\n  Call trace:\n   dump_backtrace+0x17c/0x1a8 arch/arm64/kernel/stacktrace.c:317\n   show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:324\n   __dump_stack lib/dump_stack.c:93 [inline]\n   dump_stack_lvl+0x94/0xc0 lib/dump_stack.c:119\n   print_report+0x144/0x7a4 mm/kasan/report.c:377\n   kasan_report+0xcc/0x128 mm/kasan/report.c:601\n   __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381\n   kvm_put_kvm+0x300/0xe68 virt/kvm/kvm_main.c:5769\n   kvm_vm_release+0x4c/0x60 virt/kvm/kvm_main.c:1409\n   __fput+0x198/0x71c fs/file_table.c:422\n   ____fput+0x20/0x30 fs/file_table.c:450\n   task_work_run+0x1cc/0x23c kernel/task_work.c:228\n   do_notify_resume+0x144/0x1a0 include/linux/resume_user_mode.h:50\n   el0_svc+0x64/0x68 arch/arm64/kernel/entry-common.c:169\n   el0t_64_sync_handler+0x90/0xfc arch/arm64/kernel/entry-common.c:730\n   el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598\n\nUpon closer inspection, it appears that we do not properly tear down the\nMMIO registration for a vCPU that fails creation late in the game, e.g.\na vCPU w/ the same ID already exists in the VM.\n\nIt is important to consider the context of commit that introduced this bug\nby moving the unregistration out of __kvm_vgic_vcpu_destroy(). That\nchange correctly sought to avoid an srcu v. config_lock inversion by\nbreaking up the vCPU teardown into two parts, one guarded by the\nconfig_lock.\n\nFix the use-after-free while avoiding lock inversion by adding a\nspecial-cased unregistration to __kvm_vgic_vcpu_destroy(). This is safe\nbecause failed vCPUs are torn down outside of the config_lock.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-416"],"references":["https://git.kernel.org/stable/c/6bcc2890b883ba1d16b8942937750565f6e9db0d","https://git.kernel.org/stable/c/ae8f8b37610269009326f4318df161206c59843e"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:57:07.693694550+00:00"},"epss":{"cve":"CVE-2024-50114","score":0.00226,"percentile":0.13395,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}