sched_ext: Fix possible deadlock in the deferred_irq_workfn()
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-667 and the CVSS impact.
Summary
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.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 6.12 and later | 6.12.68, 6.17.12, 6.18 | Patch available | CNA |
- Linux VendorLinux Affected 6.12 and later Fixed in 6.12.68, 6.17.12, 6.18 Patch available CNA
CPE configurations NVD · 7
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 6.12 to before 6.12.68; 6.13 to before 6.17.12 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.18:rc1:*:*:*:*:*:* | 6.18 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.18:rc2:*:*:*:*:*:* | 6.18 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.18:rc3:*:*:*:*:*:* | 6.18 rc3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.18:rc4:*:*:*:*:*:* | 6.18 rc4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.18:rc5:*:*:*:*:*:* | 6.18 rc5 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.18:rc6:*:*:*:*:*:* | 6.18 rc6 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 6.12 to before 6.12.68; 6.13 to before 6.17.12 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.18:rc1:*:*:*:*:*:* Versions 6.18 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.18:rc2:*:*:*:*:*:* Versions 6.18 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.18:rc3:*:*:*:*:*:* Versions 6.18 rc3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.18:rc4:*:*:*:*:*:* Versions 6.18 rc4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.18:rc5:*:*:*:*:*:* Versions 6.18 rc5 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.18:rc6:*:*:*:*:*:* Versions 6.18 rc6 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 6.12.68, 6.17.12, 6.18
Vendor assessments
Red Hat
Not affected: 5 products
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2025-68333
- 2026-10-03 Alias added: GHSA-xw74-3hjf-3xpv
References
More Linux Kernel vulnerabilities
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- TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
Sources
- CVE-2025-68333 · CVE Program
- CVE-2025-68333 · NVD
- FIRST EPSS
- GHSA-xw74-3hjf-3xpv · GitHub Advisory Database · CC BY 4.0
- CVE-2025-68333 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences