CVE-2025-68333

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.

CVSS Details

CVSS Score

5.5

Severity

MEDIUM

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Configurations (Affected Products)

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:linux:linux_kernel:6.18:rc1:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:linux:linux_kernel:6.18:rc2:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:linux:linux_kernel:6.18:rc3:*:*:*:*:*:* - VULNERABLE

Linux kernel < 6.12 (启用PREEMPT_RT补丁)

Linux kernel < 6.11.0 (sched_ext相关版本)

特定版本: 6.1.x, 6.6.x, 6.10.x 等

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

# 触发sched_ext竞态条件的PoC
# 需要启用PREEMPT_RT的Linux内核
import os
import threading

def trigger_race_condition():
    pid = os.fork()
    if pid == 0:
        # 子进程尝试触发竞态
        while True:
            os.sched_yield()
    else:
        # 父进程同时执行调度操作
        while True:
            os.sched_yield()

trigger_race_condition()

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2025-68333
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2025-68333
[3] CVE Details https://www.cvedetails.com/cve/CVE-2025-68333/
[4] VulDB https://vuldb.com/cve/CVE-2025-68333
[5] https://git.kernel.org/stable/c/541959b2fadb832a7d0ceb95041dc52bdcf6bff7
[6] https://git.kernel.org/stable/c/600b4379b9a7ba41340d652211fb29699da4c629
[7] https://git.kernel.org/stable/c/a257e974210320ede524f340ffe16bf4bf0dda1e

Raw JSON Data

JSON

{"cve": {"id": "CVE-2025-68333", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2025-12-22T17:16:01.020", "lastModified": "2026-02-26T15:53:10.370", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched_ext: Fix possible deadlock in the deferred_irq_workfn()\n\nFor PREEMPT_RT=y kernels, the deferred_irq_workfn() is executed in\nthe per-cpu irq_work/* task context and not disable-irq, if the rq\nreturned by container_of() is current CPU's rq, the following scenarios\nmay occur:\n\nlock(&rq->__lock);\n<Interrupt>\n lock(&rq->__lock);\n\nThis commit use IRQ_WORK_INIT_HARD() to replace init_irq_work() to\ninitialize rq->scx.deferred_irq_work, make the deferred_irq_workfn()\nis always invoked in hard-irq context."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-667"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.12.68", "matchCriteriaId": "F8C0E8D6-8E82-4C89-9E21-22B487A9E76D"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.17.12", "matchCriteriaId": "F127AFC1-F5BC-4C9F-88BE-2D2092F99E33"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.18:rc1:*:*:*:*:*:*", "matchCriteriaId": "DD01661D-DFC8-4B6D-80E7-46D203CC4565"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.18:rc2:*:*:*:*:*:*", "matchCriteriaId": "A8A65C5A-918F-4E0B-8E98-08A29FFBA58A"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.18:rc3:*:*:*:*:*:*", "matchCriteriaId": "26CA425A-E44F-49D2-92D9-1DDD56398440"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.18:rc4:*:*:*:*:*:*", "matchCriteriaId": "BEEBB43A-4C9F-46BE-AA6D-9DBFD2244E55"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.18:rc5:*:*:*:*:*:*", "matchCriteriaId": "2545FB83-C4A6-4F62-9ED1-09F75D2E3C78"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.18:rc6:*:*:*:*:*:*", "matchCriteriaId": "E955EC5D-4684-4B5D-AE4D-F2BF9ADDBA1D"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/541959b2fadb832a7d0ceb95041dc52bdcf6bff7", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/600b4379b9a7ba41340d652211fb29699da4c629", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/a257e974210320ede524f340ffe16bf4bf0dda1e", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}