CVE-2025-21786
published 2025-02-27CVE-2025-21786: In the Linux kernel, the following vulnerability has been resolved: workqueue: Put the pwq after detaching the rescuer from the pool The commit…
PriorityP340high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
0.23%
13.9th percentile
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
23 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | linux | < linux 6.12.16-1 (forky) | linux 6.12.16-1 (forky) |
| linux | linux | — | — |
| linux | linux | >= 68f83057b913467a999e1bf9e0da6a119668f769 < e7c16028a424dd35be1064a68fa318be4359310f | e7c16028a424dd35be1064a68fa318be4359310f |
| linux | linux | >= 68f83057b913467a999e1bf9e0da6a119668f769 < 835b69c868f53f959d4986bbecd561ba6f38e492 | 835b69c868f53f959d4986bbecd561ba6f38e492 |
| linux | linux | >= 68f83057b913467a999e1bf9e0da6a119668f769 < e76946110137703c16423baf6ee177b751a34b7e | e76946110137703c16423baf6ee177b751a34b7e |
| linux | linux_kernel | < 6.12.16 | 6.12.16 |
| linux | linux_kernel | >= 0 < 6.12.16-1 | 6.12.16-1 |
| linux | linux_kernel | >= 0 < 6.12.16-1 | 6.12.16-1 |
| linux | linux_kernel | >= 0 < 6.8.0-78.78 | 6.8.0-78.78 |
| linux | linux_kernel | >= 6.13 < 6.13.4 | 6.13.4 |
| msrc | azl3_kernel_6.6.104.2-4_on_azure_linux_3.0 | — | — |
| msrc | azl3_kernel_6.6.112.1-2_on_azure_linux_3.0 | — | — |
| msrc | azl3_kernel_6.6.117.1-1_on_azure_linux_3.0 | — | — |
| msrc | azl3_kernel_6.6.119.3-1_on_azure_linux_3.0 | — | — |
| msrc | azl3_kernel_6.6.119.3-3_on_azure_linux_3.0 | — | — |
| msrc | azl3_kernel_6.6.121.1-1_on_azure_linux_3.0 | — | — |
| msrc | azl3_kernel_6.6.126.1-1_on_azure_linux_3.0 | — | — |
| msrc | azl3_kernel_6.6.130.1-3_on_azure_linux_3.0 | — | — |
| msrc | azl3_kernel_6.6.96.2-1_on_azure_linux_3.0 | — | — |
| msrc | azl3_kernel_6.6.96.2-2_on_azure_linux_3.0 | — | — |
| msrc | cbl2_kernel_5.15.186.1-1_on_cbl_mariner_2.0 | — | — |
| msrc | cbl2_kernel_5.15.200.1-1_on_cbl_mariner_2.0 | — | — |
| msrc | cbl2_kernel_5.15.202.1-1_on_cbl_mariner_2.0 | — | — |
CVSS provenance
nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
osv7.8HIGH
vendor_debian7.8LOW
vendor_msrc7.8HIGH
vendor_redhat7.8HIGH
vendor_ubuntu5.5MEDIUM
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An attacker could possibly use these to compromise the system.
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- Block layer subsystem;
- Serial ATA and Parallel ATA drivers;
- Drivers core;
- Network block device driver;
- Bluetooth drivers;
- Character device driver;
- TPM device driver;
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- Hardware crypto device drivers;
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GHSA
GHSA-jfr9-726h-gv8r: In the Linux kernel, the following vulnerability has been resolved:
workqueue: Put the pwq after detaching the rescuer from the pool
The commit 68f8
ghsa_unreviewed·2025-02-27
CVE-2025-21786 [HIGH] CWE-416 GHSA-jfr9-726h-gv8r: In the Linux kernel, the following vulnerability has been resolved:
workqueue: Put the pwq after detaching the rescuer from the pool
The commit 68f8
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.
OSV
CVE-2025-21786: In the Linux kernel, the following vulnerability has been resolved: workqueue: Put the pwq after detaching the rescuer from the pool The commit 68f830
osv·2025-02-27·CVSS 7.8
CVE-2025-21786 [HIGH] CVE-2025-21786: In the Linux kernel, the following vulnerability has been resolved: workqueue: Put the pwq after detaching the rescuer from the pool The commit 68f830
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.
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This update corrects flaws in the following subsystems:
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- Serial ATA and Parallel ATA drivers;
- Drivers core;
- Network block device driver;
- Character device driver;
- TPM device driver;
- Clock framework and drivers;
- FireWire subsystem;
- GPIO subsystem;
- GPU drivers;
- HID subsystem;
- I3C subsystem;
- InfiniBand drivers;
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An attacker could possibly use these to compromise the system.
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- PowerPC architecture;
- x86 architecture;
- Block layer subsystem;
- GPIO subsystem;
- GPU drivers;
- HID subsystem;
- Input Device (Mouse) drivers;
- Multiple devices driver;
- Media drivers;
- Network drivers;
- PCI subsystem;
- S/390 drivers;
- SPI subsystem;
- Trusted Execution Environment drivers;
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- USB core drivers;
- USB Gadget drivers;
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- Multiple devices driver;
- Media drivers;
- Network drivers;
- PCI subsystem;
- S/390 drivers;
- SPI subsystem;
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An attacker could possibly use these to compromise the system.
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- x86 architecture;
- Block layer subsystem;
- GPIO subsystem;
- GPU drivers;
- HID subsystem;
- Input Device (Mouse) drivers;
- Multiple devices driver;
- Media drivers;
- Network drivers;
- PCI subsystem;
- S/390 drivers;
- SPI subsystem;
- Trusted Execution Environment drivers;
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- PowerPC architecture;
- x86 architecture;
- Block layer subsystem;
- GPIO subsystem;
- GPU drivers;
- HID subsystem;
- Input Device (Mouse) drivers;
- Multiple devices driver;
- Media drivers;
- Network drivers;
- PCI subsystem;
- S/390 drivers;
- SPI subsystem;
- Trusted Execution Environment drivers;
- UFS subsystem;
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An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
- PowerPC architecture;
- x86 architecture;
- Block layer subsystem;
- GPIO subsystem;
- GPU drivers;
- HID subsystem;
- Input Device (Mouse) drivers;
- Multiple devices driver;
- Media drivers;
- Network drivers;
- PCI subsystem;
- S/390 drivers;
- SPI subsystem;
- Trusted Execution Environment drivers;
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Summary: Several security issues were fixed in the Linux kernel.
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An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
- PowerPC architecture;
- x86 architecture;
- Block layer subsystem;
- Serial ATA and Parallel ATA drivers;
- Drivers core;
- Network block device driver;
- Bluetooth drivers;
- Character device driver;
- TPM device driver;
- Clock framework and drivers;
- Hardware crypto device drivers;
- FireWire subsystem;
- EFI core;
- Qualcomm firmware drivers;
- GPIO subsystem;
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Title: Linux kernel (AWS) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
- PowerPC architecture;
- x86 architecture;
- Block layer subsystem;
- Serial ATA and Parallel ATA drivers;
- Drivers core;
- Network block device driver;
- Bluetooth drivers;
- Character device driver;
- TPM device driver;
- Clock framework and drivers;
- Hardware crypto device drivers;
- FireWire subsystem;
- EFI core;
- Qualcomm firmware drivers;
- GPIO subsystem;
- GPU drivers;
- HID subsystem;
- I2C subsystem;
- I3C subsystem;
- InfiniBand drivers;
- Input Device (Mouse) drivers;
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CVE-2025-21716 Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
- PowerPC architecture;
- x86 architecture;
- Block layer subsystem;
- Serial ATA and Parallel ATA drivers;
- Drivers core;
- Network block device driver;
- Bluetooth drivers;
- Character device driver;
- TPM device driver;
- Clock framework and drivers;
- Hardware crypto device drivers;
- FireWire subsystem;
- EFI core;
- Qualcomm firmware drivers;
- GPIO subsystem;
- GPU drivers;
- HID subsystem;
- I2C subsystem;
- I3C subsystem;
- InfiniBand drivers;
- Input Device (Mouse) drivers;
- IOM
Red Hat
kernel: workqueue: Put the pwq after detaching the rescuer from the pool
vendor_redhat·2025-02-27·CVSS 7.8
CVE-2025-21786 [HIGH] CWE-416 kernel: workqueue: Put the pwq after detaching the rescuer from the pool
kernel: workqueue: Put the pwq after detaching the rescuer from the pool
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.
A vulnerability was found in the Linux kernel's work queue subsystem, which manages background
Microsoft
workqueue: Put the pwq after detaching the rescuer from the pool
vendor_msrc·2025-02-11·CVSS 7.8
CVE-2025-21786 [HIGH] CWE-416 workqueue: Put the pwq after detaching the rescuer from the pool
workqueue: Put the pwq after detaching the rescuer from the pool
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.
Mariner: Mariner
Linux: Linux
Customer Action Required: Yes
Debian
CVE-2025-21786: linux - In the Linux kernel, the following vulnerability has been resolved: workqueue: ...
vendor_debian·2025·CVSS 7.8
CVE-2025-21786 [HIGH] CVE-2025-21786: linux - In the Linux kernel, the following vulnerability has been resolved: workqueue: ...
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.
Scope: local
bookworm: resolved
bullseye: resolved
forky: resolved (fixed in 6.12.16-1)
sid: resolved (fixed in 6.12.16-1)
trixie: resolved (fixed in 6.12.16-1)
No detection rules found.
No public exploits indexed.
2025-02-27
Published