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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Linux | 6.12 | 6.12.68 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 6.17.12-1 | — |
| Debian 13 | linux | 6.12.69-1 | DSA-6126-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 25.10 | linux | 6.17.0-19.19 | USN-8094-1 |
| Ubuntu 25.10 | linux-aws +2 | 6.17.0-1009.9 | USN-8094-1 |
| Ubuntu 25.10 | linux-azure +1 | 6.17.0-1010.10 | USN-8094-5, USN-8094-4 |
| Ubuntu 25.10 | linux-azure-fde | No fix yet | — |
| Ubuntu 25.10 | linux-realtime | 6.17.0-1008.9 | USN-8094-2 |
| Ubuntu 25.10 | linux-riscv | 6.17.0-19.19.1 | — |
| Ubuntu 24.04 LTS | linux-aws-6.17 | 6.17.0-1009.9~24.04.2 | USN-8094-1 |
| Ubuntu 24.04 LTS | linux-azure-6.17 | 6.17.0-1010.10~24.04.1 | USN-8094-4 |
| Ubuntu 24.04 LTS | linux-gcp-6.17 | 6.17.0-1009.9~24.04.3 | USN-8094-2 |
| Ubuntu 24.04 LTS | linux-hwe-6.17 | 6.17.0-19.19~24.04.2 | USN-8094-1 |
| Ubuntu 24.04 LTS | linux-nvidia-6.17 | 6.17.0-1018.18 | — |
| Ubuntu 24.04 LTS | linux-oem-6.17 | 6.17.0-1017.17 | USN-8152-1 |
| Ubuntu 24.04 LTS | linux-oracle-6.17 | 6.17.0-1009.9~24.04.1 | USN-8094-1 |
| Ubuntu 24.04 LTS | linux-riscv +19 | No fix yet | — |
| Ubuntu 24.04 LTS | linux-riscv-6.17 | 6.17.0-19.19.1~24.04.1 | — |
| Ubuntu 22.04 LTS | linux-riscv +32 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gke +28 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp +14 | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu Pro Realtime 24.04 LTS | linux-realtime-6.14 | No fix yet | — |
| Ubuntu Pro Realtime 24.04 LTS | linux-realtime-6.17 | 6.17.0-1008.9~24.04.1 | USN-8094-3 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | kernel-livepatch-6.12.68-92.122 | 1:1.0-0.amzn2023 | ALAS2023-2026-1455 |
| Amazon Linux 2023 | perf6.12 +14 | 1:6.12.68-92.122.amzn2023 | ALAS2023-2026-1455 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | kernel-uek +34 | 6.12.0-200.74.27.el10uek | ELSA-2026-50372, ELSA-2026-50232, ELSA-2026-50160 |
Advisories 12
- USN-8094-1 linux, linux-aws, linux-aws-6.17, linux-gcp, linux-hwe-6.17, linux-oracle, linux-oracle-6.17 vulnerabilities Ubuntu Security Notices (USN) · Nov 4, 2026
- USN-8094-2 linux-gcp-6.17, linux-realtime vulnerabilities Ubuntu Security Notices (USN) · Nov 4, 2026
- USN-8152-1 linux-oem-6.17 vulnerabilities Ubuntu Security Notices (USN) · Nov 4, 2026
- USN-8094-3 linux-realtime-6.17 vulnerabilities Ubuntu Security Notices (USN) · Nov 4, 2026
- USN-8094-4 linux-azure, linux-azure-6.17 vulnerabilities Ubuntu Security Notices (USN) · Nov 4, 2026
- USN-8094-5 linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Nov 4, 2026
- WID-SEC-2025-2914 Linux Kernel: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Sep 3, 2026
- ELSA-2026-50372 Important: Unbreakable Enterprise kernel security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jul 2, 2026
- ELSA-2026-50232 Important: Unbreakable Enterprise kernel security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Apr 15, 2026
- ELSA-2026-50160 Important: Unbreakable Enterprise kernel security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Mar 20, 2026
- DSA-6126-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- ALAS2023-2026-1455 Important: kernel6.12 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Mar 5, 2026