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CVE Record

CVE-2023-53067: LoongArch: Only call get_timer_irq() once in constant_clockevent_init()

In the Linux kernel, the following vulnerability has been resolved: LoongArch: Only call get_timer_irq() once in constant_clockevent_init() Under CONFIG_DEBUG_ATOMIC_SLEEP=y and CONFIG_DEBUG_PREEMPT=y, we can see the following messages on LoongArch, this is because using might_sleep() in preemption disable context. [ 0.001127] smp: Bringing up secondary CPUs ... [ 0.001222] Booting CPU#1... [ 0.001244] 64-bit Loongson Processor probed (LA464 Core) [ 0.001247] CPU1 revision is: 0014c012 (Loongson-64bit) [ 0.001250] FPU1 revision is: 00000000 [ 0.001252] BUG: sleeping function called from invalid context at kernel/locking/mutex.c:283 [ 0.001255] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 0, name: swapper/1 [ 0.001257] preempt_count: 1, expected: 0 [ 0.001258] RCU nest depth: 0, expected: 0 [ 0.001259] Preemption disabled at: [ 0.001261] [<9000000000223800>] arch_dup_task_struct+0x20/0x110 [ 0.001272] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.2.0-rc7+ #43 [ 0.001275] Hardware name: Loongson Loongson-3A5000-7A1000-1w-A2101/Loongson-LS3A5000-7A1000-1w-A2101, BIOS vUDK2018-LoongArch-V4.0.05132-beta10 12/13/202 [ 0.001277] Stack : 0072617764726148 0000000000000000 9000000000222f1c 90000001001e0000 [ 0.001286] 90000001001e3be0 90000001001e3be8 0000000000000000 0000000000000000 [ 0.001292] 90000001001e3be8 0000000000000040 90000001001e3cb8 90000001001e3a50 [ 0.001297] 9000000001642000 90000001001e3be8 be694d10ce4139dd 9000000100174500 [ 0.001303] 0000000000000001 0000000000000001 00000000ffffe0a2 0000000000000020 [ 0.001309] 000000000000002f 9000000001354116 00000000056b0000 ffffffffffffffff [ 0.001314] 0000000000000000 0000000000000000 90000000014f6e90 9000000001642000 [ 0.001320] 900000000022b69c 0000000000000001 0000000000000000 9000000001736a90 [ 0.001325] 9000000100038000 0000000000000000 9000000000222f34 0000000000000000 [ 0.001331] 00000000000000b0 0000000000000004 0000000000000000 0000000000070000 [ 0.001337] ... [ 0.001339] Call Trace: [ 0.001342] [<9000000000222f34>] show_stack+0x5c/0x180 [ 0.001346] [<90000000010bdd80>] dump_stack_lvl+0x60/0x88 [ 0.001352] [<9000000000266418>] __might_resched+0x180/0x1cc [ 0.001356] [<90000000010c742c>] mutex_lock+0x20/0x64 [ 0.001359] [<90000000002a8ccc>] irq_find_matching_fwspec+0x48/0x124 [ 0.001364] [<90000000002259c4>] constant_clockevent_init+0x68/0x204 [ 0.001368] [<900000000022acf4>] start_secondary+0x40/0xa8 [ 0.001371] [<90000000010c0124>] smpboot_entry+0x60/0x64 Here are the complete call chains: smpboot_entry() start_secondary() constant_clockevent_init() get_timer_irq() irq_find_matching_fwnode() irq_find_matching_fwspec() mutex_lock() might_sleep() __might_sleep() __might_resched() In order to avoid the above issue, we should break the call chains, using timer_irq_installed variable as check condition to only call get_timer_irq() once in constant_clockevent_init() is a simple and proper way.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel LoongArch issue in timer interrupt initialization. On affected LoongArch systems, the kernel can call code that may sleep while preemption and interrupts are disabled, producing a boot-time kernel warning under debug configurations. The sources do not show remote exploitation, data exposure, or privilege escalation.

Executive priority

Treat as targeted maintenance for LoongArch Linux fleets, not broad emergency response. Prioritize patch tracking where LoongArch systems support production services or kernel stability is safety-critical.

Technical view

In constant_clockevent_init(), repeated get_timer_irq() calls can reach irq_find_matching_fwspec(), mutex_lock(), and might_sleep() while running in a preemption-disabled context. The resolved change uses timer_irq_installed as a guard so get_timer_irq() is called only once.

Likely exposure

Exposure appears limited to Linux kernels on LoongArch systems using affected kernel versions or commits. Organizations without LoongArch hardware are unlikely to be exposed based on the provided sources.

Exploitation context

The bundle does not cite KEV listing, active exploitation, public exploit activity, or a practical attack path. Evidence describes a kernel correctness issue observed during CPU bring-up with debug atomic sleep and preemption checks enabled.

Researcher notes

The source evidence is narrow: it names the call chain, affected Linux/LoongArch context, and stable commit references. It does not provide CVSS, CWE, attacker requirements, exploitability analysis, or distribution-specific fixed versions.

Mitigation direction

  • Check Linux vendor advisories for your distribution and LoongArch kernel builds.
  • Upgrade to a kernel containing one of the referenced stable fixes.
  • For custom kernels, confirm the timer_irq_installed guard is present.
  • Prioritize systems running LoongArch hardware and affected kernel branches.

Validation and detection

  • Inventory Linux systems running on LoongArch hardware.
  • Compare deployed kernel versions and commits against affected entries and stable fixes.
  • Review boot logs for invalid sleep warnings around constant_clockevent_init().
  • After updating, retest boot on representative LoongArch systems.
Prepared
Confidence
medium
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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0CVSS vectors
3Timeline events
0ADP providers
4Source links

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  2. CVE publishedCVE Program

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  3. CVE updatedCVE Program

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Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxfa96b57c149061f71a70bd6582d995f6424fbbf4, fa96b57c149061f71a70bd6582d995f6424fbbf4, fa96b57c149061f71a70bd6582d995f6424fbbf4unaffected
LinuxLinux5.19, 0, 6.1.21, 6.2.8, 6.3affected
Weakness

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