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CVE-2025-68333— sched_ext: Fix possible deadlock in the deferred_irq_workfn()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于PREEMPT_RT=y内核中deferred_irq_workfn可能发生死锁。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.11% · P1

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 5b26f7b920f76b2b9cc398c252a9e35e44bf5bb9< 541959b2fadb832a7d0ceb95041dc52bdcf6bff7 affected
5b26f7b920f76b2b9cc398c252a9e35e44bf5bb9< 600b4379b9a7ba41340d652211fb29699da4c629 affected
5b26f7b920f76b2b9cc398c252a9e35e44bf5bb9< a257e974210320ede524f340ffe16bf4bf0dda1e affected
6.12 affected
< 6.12 unaffected
6.12.68≤ 6.12.* unaffected
6.17.12≤ 6.17.* unaffected
6.18≤ * unaffected
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I. Basic Information for CVE-2025-68333

Vulnerability Information
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Vulnerability Title
sched_ext: Fix possible deadlock in the deferred_irq_workfn()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: sched_ext: Fix possible deadlock in the deferred_irq_workfn() For PREEMPT_RT=y kernels, the deferred_irq_workfn() is executed in the per-cpu irq_work/* task context and not disable-irq, if the rq returned by container_of() is current CPU's rq, the following scenarios may occur: lock(&rq->__lock); <Interrupt> lock(&rq->__lock); This commit use IRQ_WORK_INIT_HARD() to replace init_irq_work() to initialize rq->scx.deferred_irq_work, make the deferred_irq_workfn() is always invoked in hard-irq context.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于PREEMPT_RT=y内核中deferred_irq_workfn可能发生死锁。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 5b26f7b920f76b2b9cc398c252a9e35e44bf5bb9 ~ 541959b2fadb832a7d0ceb95041dc52bdcf6bff7 -
Linux Linux 6.12 -

II. Public POCs for CVE-2025-68333

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III. Intelligence Information for CVE-2025-68333

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Same Patch Batch · Linux · 2025-12-22 · 12 CVEs total

CVE-2025-68337 7.5 HIGH jbd2: avoid bug_on in jbd2_journal_get_create_access() when file system corrupted
CVE-2025-68336 7.5 HIGH locking/spinlock/debug: Fix data-race in do_raw_write_lock
CVE-2025-68335 comedi: pcl818: fix null-ptr-deref in pcl818_ai_cancel()
CVE-2025-68334 platform/x86/amd/pmc: Add support for Van Gogh SoC
CVE-2025-68332 comedi: c6xdigio: Fix invalid PNP driver unregistration
CVE-2025-68331 usb: uas: fix urb unmapping issue when the uas device is remove during ongoing data transf
CVE-2025-68330 iio: accel: bmc150: Fix irq assumption regression
CVE-2025-68329 tracing: Fix WARN_ON in tracing_buffers_mmap_close for split VMAs
CVE-2025-68328 firmware: stratix10-svc: fix bug in saving controller data
CVE-2025-68327 usb: renesas_usbhs: Fix synchronous external abort on unbind
CVE-2025-68326 drm/xe/guc: Fix stack_depot usage

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-68333

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