Description
In the Linux kernel, the following vulnerability has been resolved:
workqueue: Put the pwq after detaching the rescuer from the pool
The commit 68f83057b913("workqueue: Reap workers via kthread_stop() and
remove detach_completion") adds code to reap the normal workers but
mistakenly does not handle the rescuer and also removes the code waiting
for the rescuer in put_unbound_pool(), which caused a use-after-free bug
reported by Cheung Wall.
To avoid the use-after-free bug, the pool’s reference must be held until
the detachment is complete. Therefore, move the code that puts the pwq
after detaching the rescuer from the pool.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Linux | 6.11 | 6.12.16 |
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 | 6.12.16-1 | — |
| Debian 13 | linux | 6.12.16-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux | 6.8.0-78.78 | USN-7703-1 |
| Ubuntu 24.04 LTS | linux-aws | 6.8.0-1035.37 | USN-7703-1 |
| Ubuntu 24.04 LTS | linux-azure | 6.8.0-1034.39 | USN-7737-1 |
| Ubuntu 24.04 LTS | linux-azure-nvidia | 6.8.0-1022.23 | USN-7737-1 |
| Ubuntu 24.04 LTS | linux-gcp | 6.8.0-1036.38 | USN-7703-2 |
| Ubuntu 24.04 LTS | linux-gcp-6.11 +1 | 6.11.0-1015.15~24.04.1 | USN-7521-1 |
| Ubuntu 24.04 LTS | linux-gke | 6.8.0-1032.36 | USN-7703-4 |
| Ubuntu 24.04 LTS | linux-gkeop | 6.8.0-1019.21 | USN-7703-2 |
| Ubuntu 24.04 LTS | linux-hwe-6.11 | 6.11.0-26.26~24.04.1 | USN-7521-1 |
| Ubuntu 24.04 LTS | linux-ibm | 6.8.0-1033.33 | USN-7703-2 |
| Ubuntu 24.04 LTS | linux-intel +4 | No fix yet | — |
| Ubuntu 24.04 LTS | linux-lowlatency | 6.8.0-78.78.1 | USN-7703-1 |
| Ubuntu 24.04 LTS | linux-lowlatency-hwe-6.11 | 6.11.0-1014.15~24.04.1 | USN-7521-3 |
| Ubuntu 24.04 LTS | linux-nvidia | 6.8.0-1035.38 | USN-7703-4 |
| Ubuntu 24.04 LTS | linux-nvidia-6.11 | 6.11.0-1010.10 | — |
| Ubuntu 24.04 LTS | linux-nvidia-lowlatency | 6.8.0-1035.38.1 | USN-7703-4 |
| Ubuntu 24.04 LTS | linux-oem-6.11 | 6.11.0-1022.22 | USN-7521-1 |
| Ubuntu 24.04 LTS | linux-oracle | 6.8.0-1032.33 | USN-7703-3 |
| Ubuntu 24.04 LTS | linux-raspi | 6.8.0-1035.39 | USN-7703-4 |
| Ubuntu 22.04 LTS | linux-aws-6.8 | 6.8.0-1035.37~22.04.1 | USN-7703-2 |
| Ubuntu 22.04 LTS | linux-azure-6.8 | 6.8.0-1034.39~22.04.1 | USN-7737-1 |
| Ubuntu 22.04 LTS | linux-gcp-6.8 | 6.8.0-1036.38~22.04.1 | USN-7703-2 |
| Ubuntu 22.04 LTS | linux-hwe-6.8 | 6.8.0-78.78~22.04.1 | USN-7703-4 |
| Ubuntu 22.04 LTS | linux-ibm-6.8 | 6.8.0-1033.33~22.04.1 | USN-7703-2 |
| Ubuntu 22.04 LTS | linux-lowlatency-hwe-6.8 | 6.8.0-78.78.1~22.04.1 | USN-7703-1 |
| Ubuntu 22.04 LTS | linux-nvidia-6.8 | 6.8.0-1035.38~22.04.1 | USN-7703-4 |
| Ubuntu 22.04 LTS | linux-oracle-6.8 | 6.8.0-1032.33~22.04.1 | USN-7703-3 |
| 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 | — |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro Realtime 24.04 LTS | linux-raspi-realtime | 6.8.0-2028.29 | USN-7719-1 |
| Ubuntu Pro Realtime 24.04 LTS | linux-realtime | 6.8.1-1030.31 | USN-7703-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | rv +76 | 6.12.0-124.8.1.el10_1 | RHSA-2025:20095 |
| RHEL 9 | rv +75 | 5.14.0-611.5.1.el9_7 | RHSA-2025:20518 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.6 EUS | rv +77 | 5.14.0-570.86.1.el9_6 | RHSA-2026:2352 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | rv +74 | 6.12.0-124.8.1.el10_1 | ALSA-2025:20095 |
| AlmaLinux 9 | rv +73 | 5.14.0-611.5.1.el9_7 | ALSA-2025:20518 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | kernel | 6.12.0-124.8.1.el10_1 | RLSA-2025:20095 |
| Rocky Linux 9 | kernel | 5.14.0-611.5.1.el9_7 | RLSA-2025:20518 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | kernel | No fix yet | — |
| Azure Linux 2 (CBL-Mariner) | kernel | No fix yet | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | kernel-uek +34 | 6.12.0-101.33.4.3.el10uek | ELSA-2025-20530, ELSA-2025-20480 |
Advisories 19
- WID-SEC-2025-0453 Linux Kernel: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 11, 2026
- USN-7737-1 linux-azure, linux-azure-6.8, linux-azure-nvidia vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-7719-1 linux-raspi-realtime vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-7703-2 linux-aws-6.8, linux-gcp, linux-gcp-6.8, linux-gkeop, linux-ibm, linux-ibm-6.8 vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7703-4 linux-gke, linux-hwe-6.8, linux-nvidia, linux-nvidia-6.8, linux-nvidia-lowlatency, linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7703-1 linux, linux-aws, linux-lowlatency, linux-lowlatency-hwe-6.8, linux-realtime vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7703-3 linux-oracle, linux-oracle-6.8 vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7521-1 linux, linux-azure, linux-azure-6.11, linux-gcp, linux-gcp-6.11, linux-hwe-6.11, linux-oem-6.11, linux-raspi, linux-realtime vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7521-3 linux-lowlatency, linux-lowlatency-hwe-6.11, linux-oracle vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- ALSA-2025:20095 Moderate: kernel security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:20518 Moderate: kernel security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2025:20518 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:20095 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- WID-SEC-2026-2253 IBM Security Verify Access: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 17, 2026
- RHSA-2026:2352 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Aug 20, 2026
- RLSA-2025:20095 Moderate: kernel security update Rocky Linux Security Advisories · Nov 27, 2025
- RLSA-2025:20518 Moderate: kernel security update Rocky Linux Security Advisories · Nov 21, 2025
- ELSA-2025-20530 Important: Unbreakable Enterprise kernel security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Aug 18, 2025
- ELSA-2025-20480 Important: Unbreakable Enterprise kernel security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jul 17, 2025