CVE-2023-53216
Estado: ModificadaAlta (7.8)—
In the Linux kernel, the following vulnerability has been resolved:
arm64: efi: Make efi_rt_lock a raw_spinlock
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.
Detalles técnicos trazas, registros y código del informe original
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)
[...]
[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
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Puntuación base: 7.8
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.17%
- Percentil entre todas las CVEs puntuadas: 5
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1068Exploitation for Privilege Escalationprivilege escalation45 % - Impacto principal
T1499.004Application or System Exploitationimpact35 %
Acceso local (AV:L) con privilegios (PR:L) sin interacción. El bug de sincronización en spinlock podría causar DoS por condición de carrera, no escalada deliberada de privilegios.
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
CWE
- NVD-CWE-noinfo
Referencias
- 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
JSON original (NVD)
Mostrar
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"value": "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.]"
}
],
"lastModified": "2026-06-17T06:44:31.907",
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