CVE-2025-68333: sched_ext: Fix possible deadlock in the deferred_irq_workfn()
Vulnerability summary
CVE-2025-68333 is a medium (CVSS 5.5) Improper Locking vulnerability in linux. EPSS estimates a 0.11% chance of exploitation in the next 30 days, higher than 1% of scored vulnerabilities.
Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 7 · Related 6Timeline
- 22-12-2025PublishedVulnerability first disclosed.
- 11-05-2026Last modifiedVulnerability information updated.
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 metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.11%
Chance of exploitation in the next 30 days
Percentile
1%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.11% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu159 products
- linuxAll versions (No fix recorded) | < 6.17.0-19.19
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 6.17.0-1009.9
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 5b26f7b920f76b2b9cc398c252a9e35e44bf5bb9, < 541959b2fadb832a7d0ceb95041dc52bdcf6bff7 | ≥ 5b26f7b920f76b2b9cc398c252a9e35e44bf5bb9, < 600b4379b9a7ba41340d652211fb29699da4c629 | ≥ 5b26f7b920f76b2b9cc398c252a9e35e44bf5bb9, < a257e974210320ede524f340ffe16bf4bf0dda1e | 6.12
- linux_kernel≥ 6.12, < 6.12.68 | ≥ 6.13, < 6.17.12 | 6.18:rc1 | 6.18:rc2 | 6.18:rc3 | 6.18:rc4 | 6.18:rc5 | 6.18:rc6
Debian1 product
- linux< 6.12.69-1 | < 6.17.12-1
3 vendors · 162 products
