CVE-2023-53216

HIGH EPSS 4.8%
Published Sep 15, 20259mo ago · Modified Jun 17, 20261w ago
7.8 CVSS 3.1
High
Find Similar
Published Sep 15, 2025 9mo ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: arm64: efi: Make efi_rt_lock a raw_spinlock Running a rt-kernel base on 6.2.0-rc3-rt1 on an Ampere Altra outputs the following: BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:46 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 9, name: kworker/u320:0 preempt_count: 2, expected: 0 RCU nest depth: 0, expected: 0 3 locks held by kworker/u320:0/9: #0: ffff3fff8c27d128 ((wq_completion)efi_rts_wq){+.+.}-{0:0}, at: process_one_work (./include/linux/atomic/atomic-long.h:41) #1: ffff80000861bdd0 ((work_completion)(&efi_rts_work.work)){+.+.}-{0:0}, at: process_one_work (./include/linux/atomic/atomic-long.h:41) #2: ffffdf7e1ed3e460 (efi_rt_lock){+.+.}-{3:3}, at: efi_call_rts (drivers/firmware/efi/runtime-wrappers.c:101) Preemption disabled at: efi_virtmap_load (./arch/arm64/include/asm/mmu_context.h:248) CPU: 0 PID: 9 Comm: kworker/u320:0 Tainted: G W 6.2.0-rc3-rt1 Hardware name: WIWYNN Mt.Jade Server System B81.03001.0005/Mt.Jade Motherboard, BIOS 1.08.20220218 (SCP: 1.08.20220218) 2022/02/18 Workqueue: efi_rts_wq efi_call_rts Call trace: dump_backtrace (arch/arm64/kernel/stacktrace.c:158) show_stack (arch/arm64/kernel/stacktrace.c:165) dump_stack_lvl (lib/dump_stack.c:107 (discriminator 4)) dump_stack (lib/dump_stack.c:114) __might_resched (kernel/sched/core.c:10134) rt_spin_lock (kernel/locking/rtmutex.c:1769 (discriminator 4)) efi_call_rts (drivers/firmware/efi/runtime-wrappers.c:101) [...] This seems to come from commit ff7a167961d1 ("arm64: efi: Execute runtime services from a dedicated stack") which adds a spinlock. This spinlock is taken through: efi_call_rts() \-efi_call_virt() \-efi_call_virt_pointer() \-arch_efi_call_virt_setup() Make 'efi_rt_lock' a raw_spinlock to avoid being preempted. [ardb: The EFI runtime services are called with a different set of translation tables, and are permitted to use the SIMD registers. The context switch code preserves/restores neither, and so EFI calls must be made with preemption disabled, rather than only disabling migration.]

CVSS Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
4.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 4

VendorProductVersionRange
linuxlinux_kernel*≥5.10.165  –  <5.10.175
linuxlinux_kernel*≥5.15.90  –  <5.15.103
linuxlinux_kernel*≥6.1.8  –  <6.1.18
linuxlinux_kernel*≥6.2  –  <6.2.5

References 5

  • git.kernel.org https://git.kernel.org/stable/c/030b1c4217a4f504c7d0795a2bd86b7181e56f11
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/0e68b5517d3767562889f1d83fdb828c26adb24f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4e8f7d998b582a99aadedd07ae6086e99b89c97a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6a72729ed6accc86dad5522895e8fa2f96642a2c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8b38969fa01662ec539a0d08a8ea5ec6f31fa4ed
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/030b1c4217a4f504c7d0795a2bd86b7181e56f11
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/0e68b5517d3767562889f1d83fdb828c26adb24f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4e8f7d998b582a99aadedd07ae6086e99b89c97a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6a72729ed6accc86dad5522895e8fa2f96642a2c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8b38969fa01662ec539a0d08a8ea5ec6f31fa4ed
    Patch