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CVE-2023-53216

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.8 · Élevée
EPSS 0.2%
Linux•Linux•Versions : 4012603cbd469223f225637d265a233f034c567a, <5.10.175, <=6.1.*, 0, f75a91c82dc805af8f718ff106ec9c090234b37b, <030b1c4217a4f504c7d0795a2bd86b7181e56f11, 5.15.103, 6.1.8, <=5.10.*, <4e8f7d998b582a99aadedd07ae6086e99b89c97a, 6.3, <6a72729ed6accc86dad5522895e8fa2f96642a2c, ff7a167961d1b97e0e205f245f806e564d3505e7, <6.1.18, <=6.2.*, <6.2, <0e68b5517d3767562889f1d83fdb828c26adb24f, <5.15.103, 5.10.175, de2af657cab92afc13a4ccd8780370481ed0eb61, 6.1.18, 5.10.165, <=*, <8b38969fa01662ec539a0d08a8ea5ec6f31fa4ed, <=5.15.*, 5.15.90, 6.2.5, 6.2

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.]

Gravité et risque d'exploitation

CVE-2023-53216 obtient un score CVSS de 7.8/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.17 %, ce qui la place devant 5.6 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions 4012603cbd469223f225637d265a233f034c567a, <5.10.175, <=6.1.*, 0, f75a91c82dc805af8f718ff106ec9c090234b37b, <030b1c4217a4f504c7d0795a2bd86b7181e56f11, 5.15.103, 6.1.8, <=5.10.*, <4e8f7d998b582a99aadedd07ae6086e99b89c97a, 6.3, <6a72729ed6accc86dad5522895e8fa2f96642a2c, ff7a167961d1b97e0e205f245f806e564d3505e7, <6.1.18, <=6.2.*, <6.2, <0e68b5517d3767562889f1d83fdb828c26adb24f, <5.15.103, 5.10.175, de2af657cab92afc13a4ccd8780370481ed0eb61, 6.1.18, 5.10.165, <=*, <8b38969fa01662ec539a0d08a8ea5ec6f31fa4ed, <=5.15.*, 5.15.90, 6.2.5, 6.2) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

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