{"cve":"CVE-2023-53216","nvd":{"published":"2025-09-15T15:15:48.273","modified":"2026-06-17T06:44:31.907","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\narm64: efi: Make efi_rt_lock a raw_spinlock\n\nRunning a rt-kernel base on 6.2.0-rc3-rt1 on an Ampere Altra outputs\nthe following:\n  BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:46\n  in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 9, name: kworker/u320:0\n  preempt_count: 2, expected: 0\n  RCU nest depth: 0, expected: 0\n  3 locks held by kworker/u320:0/9:\n  #0: ffff3fff8c27d128 ((wq_completion)efi_rts_wq){+.+.}-{0:0}, at: process_one_work (./include/linux/atomic/atomic-long.h:41)\n  #1: ffff80000861bdd0 ((work_completion)(&efi_rts_work.work)){+.+.}-{0:0}, at: process_one_work (./include/linux/atomic/atomic-long.h:41)\n  #2: ffffdf7e1ed3e460 (efi_rt_lock){+.+.}-{3:3}, at: efi_call_rts (drivers/firmware/efi/runtime-wrappers.c:101)\n  Preemption disabled at:\n  efi_virtmap_load (./arch/arm64/include/asm/mmu_context.h:248)\n  CPU: 0 PID: 9 Comm: kworker/u320:0 Tainted: G        W          6.2.0-rc3-rt1\n  Hardware name: WIWYNN Mt.Jade Server System B81.03001.0005/Mt.Jade Motherboard, BIOS 1.08.20220218 (SCP: 1.08.20220218) 2022/02/18\n  Workqueue: efi_rts_wq efi_call_rts\n  Call trace:\n  dump_backtrace (arch/arm64/kernel/stacktrace.c:158)\n  show_stack (arch/arm64/kernel/stacktrace.c:165)\n  dump_stack_lvl (lib/dump_stack.c:107 (discriminator 4))\n  dump_stack (lib/dump_stack.c:114)\n  __might_resched (kernel/sched/core.c:10134)\n  rt_spin_lock (kernel/locking/rtmutex.c:1769 (discriminator 4))\n  efi_call_rts (drivers/firmware/efi/runtime-wrappers.c:101)\n  [...]\n\nThis seems to come from commit ff7a167961d1 (\"arm64: efi: Execute\nruntime services from a dedicated stack\") which adds a spinlock. This\nspinlock is taken through:\nefi_call_rts()\n\\-efi_call_virt()\n  \\-efi_call_virt_pointer()\n    \\-arch_efi_call_virt_setup()\n\nMake 'efi_rt_lock' a raw_spinlock to avoid being preempted.\n\n[ardb: The EFI runtime services are called with a different set of\n       translation tables, and are permitted to use the SIMD registers.\n       The context switch code preserves/restores neither, and so EFI\n       calls must be made with preemption disabled, rather than only\n       disabling migration.]","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":[],"references":["https://git.kernel.org/stable/c/030b1c4217a4f504c7d0795a2bd86b7181e56f11","https://git.kernel.org/stable/c/0e68b5517d3767562889f1d83fdb828c26adb24f","https://git.kernel.org/stable/c/4e8f7d998b582a99aadedd07ae6086e99b89c97a","https://git.kernel.org/stable/c/6a72729ed6accc86dad5522895e8fa2f96642a2c","https://git.kernel.org/stable/c/8b38969fa01662ec539a0d08a8ea5ec6f31fa4ed"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:08:41.295252406+00:00"},"epss":{"cve":"CVE-2023-53216","score":0.00168,"percentile":0.06005,"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."]}