CVE-2025-21655
published 2025-01-20CVE-2025-21655: In the Linux kernel, the following vulnerability has been resolved: io_uring/eventfd: ensure io_eventfd_signal() defers another RCU period…
PriorityP415medium4.7CVSS 3.1
AVLACHPRLUINSUCNINAH
EPSS
0.25%
16.0th percentile
In the Linux kernel, the following vulnerability has been resolved:
io_uring/eventfd: ensure io_eventfd_signal() defers another RCU period
io_eventfd_do_signal() is invoked from an RCU callback, but when
dropping the reference to the io_ev_fd, it calls io_eventfd_free()
directly if the refcount drops to zero. This isn't correct, as any
potential freeing of the io_ev_fd should be deferred another RCU grace
period.
Just call io_eventfd_put() rather than open-code the dec-and-test and
free, which will correctly defer it another RCU grace period.
Affected
20 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | linux | < linux 6.1.128-1 (bookworm) | linux 6.1.128-1 (bookworm) |
| debian | linux-6.1 | < linux 6.1.128-1 (bookworm) | linux 6.1.128-1 (bookworm) |
| linux | linux | — | — |
| linux | linux | >= 21a091b970cdbcf3e8ff829234b51be6f9192766 < 6b63308c28987c6010b1180c72a6db4df6c68033 | 6b63308c28987c6010b1180c72a6db4df6c68033 |
| linux | linux | >= 21a091b970cdbcf3e8ff829234b51be6f9192766 < 8efff2aa2d95dc437ab67c5b4a9f1d3f367baa10 | 8efff2aa2d95dc437ab67c5b4a9f1d3f367baa10 |
| linux | linux | >= 21a091b970cdbcf3e8ff829234b51be6f9192766 < a7085c3ae43b86d4b3d1b8275e6a67f14257e3b7 | a7085c3ae43b86d4b3d1b8275e6a67f14257e3b7 |
| linux | linux | >= 21a091b970cdbcf3e8ff829234b51be6f9192766 < c9a40292a44e78f71258b8522655bffaf5753bdb | c9a40292a44e78f71258b8522655bffaf5753bdb |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 0 < 6.1.128-1 | 6.1.128-1 |
| linux | linux_kernel | >= 0 < 6.12.10-1 | 6.12.10-1 |
| linux | linux_kernel | >= 0 < 6.12.10-1 | 6.12.10-1 |
| linux | linux_kernel | >= 0 < 6.8.0-60.63 | 6.8.0-60.63 |
| linux | linux_kernel | >= 6.1 < 6.1.125 | 6.1.125 |
| linux | linux_kernel | >= 6.2 < 6.6.72 | 6.6.72 |
| linux | linux_kernel | >= 6.7 < 6.12.10 | 6.12.10 |
CVSS provenance
nvdv3.14.7MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
osv7.8HIGH
vendor_ubuntu7.8HIGH
vendor_debian4.7MEDIUM
vendor_redhat4.7MEDIUM
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- Microsoft Hyper-V drivers;
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- Ublk userspace block driver;
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- Microsoft Hyper-V drivers;
- Hardware monitoring drivers;
- IIO ADC drivers;
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- InfiniBand drivers;
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- RISC-V architecture;
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- ACPI drivers;
- Drivers core;
- Ublk userspace block driver;
- Virtio block driver;
- DMA engine subsystem;
- GPU drivers;
- Microsoft Hyper-V drivers;
- Hardware monitoring drivers;
- IIO ADC drivers;
- IIO subsystem;
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- Multiple devices driver;
- Media drivers;
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- STMicroelectronics network drivers;
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- ACPI drivers;
- Drivers core;
- Ublk userspace block driver;
- Virtio block driver;
- DMA engine subsystem;
- GPU drivers;
- Microsoft Hyper-V drivers;
- Hardware monitoring drivers;
- IIO ADC drivers;
- IIO subsystem;
- InfiniBand drivers;
- Multiple devices driver;
- Media drivers;
- Microchip PCI driver;
- Network drivers;
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- STMicroelectronics network drivers;
- PCI subsystem;
- Pin controllers subsystem;
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- ARM64 architecture;
- MIPS architecture;
- PowerPC architecture;
- RISC-V architecture;
- S390 architecture;
- x86 architecture;
- Block layer subsystem;
- Compute Acceleration Framework;
- ACPI drivers;
- Drivers core;
- Ublk userspace block driver;
- Virtio block driver;
- Bluetooth drivers;
- Buffer Sharing and Synchronization framework;
- DMA engine subsystem;
- EFI core;
- GPIO subsystem;
- GPU drivers;
- HID subsystem;
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- Hardware monitoring drivers;
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- ARM64 architecture;
- MIPS architecture;
- PowerPC architecture;
- RISC-V architecture;
- S390 architecture;
- x86 architecture;
- Block layer subsystem;
- Compute Acceleration Framework;
- ACPI drivers;
- Drivers core;
- Ublk userspace block driver;
- Virtio block driver;
- Bluetooth drivers;
- Buffer Sharing and Synchronization framework;
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This update corrects flaws in the following subsystems:
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- PowerPC architecture;
- RISC-V architecture;
- S390 architecture;
- x86 architecture;
- Block layer subsystem;
- Compute Acceleration Framework;
- ACPI drivers;
- Drivers core;
- Ublk userspace block driver;
- Virtio block driver;
- Bluetooth drivers;
- Buffer Sharing and Synchronization framework;
- DMA engine subsystem;
- EFI core;
- GPIO subsystem;
- GPU drivers;
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- ARM64 architecture;
- MIPS architecture;
- PowerPC architecture;
- RISC-V architecture;
- S390 architecture;
- x86 architecture;
- Block layer subsystem;
- Compute Acceleration Framework;
- ACPI drivers;
- Drivers core;
- Ublk userspace block driver;
- Virtio block driver;
- Bluetooth drivers;
- Buffer Sharing and Synchronization framework;
- DMA engine subsystem;
- EFI core;
- GPIO subsystem;
- GPU drivers;
- HID subsystem;
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denial of service (system crash) or possibly execute arbitrary code.
(CVE-2025-0927)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
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- MIPS architecture;
- PowerPC architecture;
- RISC-V architecture;
- S390 architecture;
- x86 architecture;
- Block layer subsystem;
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- ACPI drivers;
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OSV
CVE-2025-21655: In the Linux kernel, the following vulnerability has been resolved: io_uring/eventfd: ensure io_eventfd_signal() defers another RCU period io_eventfd_
osv·2025-01-20·CVSS 4.7
CVE-2025-21655 [MEDIUM] CVE-2025-21655: In the Linux kernel, the following vulnerability has been resolved: io_uring/eventfd: ensure io_eventfd_signal() defers another RCU period io_eventfd_
In the Linux kernel, the following vulnerability has been resolved: io_uring/eventfd: ensure io_eventfd_signal() defers another RCU period io_eventfd_do_signal() is invoked from an RCU callback, but when dropping the reference to the io_ev_fd, it calls io_eventfd_free() directly if the refcount drops to zero. This isn't correct, as any potential freeing of the io_ev_fd should be deferred another RCU grace period. Just call io_eventfd_put() rather than open-code the dec-and-test and free, which will correctly defer it another RCU grace period.
GHSA
GHSA-vwm2-fvjj-vcv3: In the Linux kernel, the following vulnerability has been resolved:
io_uring/eventfd: ensure io_eventfd_signal() defers another RCU period
io_eventf
ghsa_unreviewed·2025-01-20
CVE-2025-21655 [MEDIUM] CWE-416 GHSA-vwm2-fvjj-vcv3: In the Linux kernel, the following vulnerability has been resolved:
io_uring/eventfd: ensure io_eventfd_signal() defers another RCU period
io_eventf
In the Linux kernel, the following vulnerability has been resolved:
io_uring/eventfd: ensure io_eventfd_signal() defers another RCU period
io_eventfd_do_signal() is invoked from an RCU callback, but when
dropping the reference to the io_ev_fd, it calls io_eventfd_free()
directly if the refcount drops to zero. This isn't correct, as any
potential freeing of the io_ev_fd should be deferred another RCU grace
period.
Just call io_eventfd_put() rather than open-code the dec-and-test and
free, which will correctly defer it another RCU grace period.
Ubuntu
Linux kernel (Oracle) vulnerabilities
vendor_ubuntu·2025-05-29·CVSS 5.5
CVE-2025-21639 [MEDIUM] Linux kernel (Oracle) vulnerabilities
Title: Linux kernel (Oracle) 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:
- RISC-V architecture;
- x86 architecture;
- Block layer subsystem;
- Compute Acceleration Framework;
- ACPI drivers;
- Drivers core;
- Ublk userspace block driver;
- Virtio block driver;
- DMA engine subsystem;
- GPU drivers;
- Microsoft Hyper-V drivers;
- Hardware monitoring drivers;
- IIO ADC drivers;
- IIO subsystem;
- InfiniBand drivers;
- Multiple devices driver;
- Media drivers;
- Microchip PCI driver;
- Network drivers;
- Mellanox network drivers;
- STMicroelectronics network drivers;
- PCI subs
Ubuntu
Linux kernel (HWE) vulnerabilities
vendor_ubuntu·2025-05-28·CVSS 5.5
CVE-2025-21639 [MEDIUM] Linux kernel (HWE) vulnerabilities
Title: Linux kernel (HWE) 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:
- RISC-V architecture;
- x86 architecture;
- Block layer subsystem;
- Compute Acceleration Framework;
- ACPI drivers;
- Drivers core;
- Ublk userspace block driver;
- Virtio block driver;
- DMA engine subsystem;
- GPU drivers;
- Microsoft Hyper-V drivers;
- Hardware monitoring drivers;
- IIO ADC drivers;
- IIO subsystem;
- InfiniBand drivers;
- Multiple devices driver;
- Media drivers;
- Microchip PCI driver;
- Network drivers;
- Mellanox network drivers;
- STMicroelectronics network drivers;
- PCI subsyst
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vendor_ubuntu·2025-05-26
CVE-2024-56551 Linux kernel (Raspberry Pi) vulnerabilities
Title: Linux kernel (Raspberry Pi) 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;
- MIPS architecture;
- PowerPC architecture;
- RISC-V architecture;
- S390 architecture;
- SuperH RISC architecture;
- User-Mode Linux (UML);
- x86 architecture;
- Block layer subsystem;
- Cryptographic API;
- Compute Acceleration Framework;
- ACPI drivers;
- Drivers core;
- RAM backed block device driver;
- Ublk userspace block driver;
- Virtio block driver;
- Compressed RAM block device driver;
- Bluetooth drivers;
- TPM device driver;
- Clock framework and drivers;
- Data
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vendor_ubuntu·2025-05-20·CVSS 5.5
CVE-2025-21639 [MEDIUM] 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:
- RISC-V architecture;
- x86 architecture;
- Block layer subsystem;
- Compute Acceleration Framework;
- ACPI drivers;
- Drivers core;
- Ublk userspace block driver;
- Virtio block driver;
- DMA engine subsystem;
- GPU drivers;
- Microsoft Hyper-V drivers;
- Hardware monitoring drivers;
- IIO ADC drivers;
- IIO subsystem;
- InfiniBand drivers;
- Multiple devices driver;
- Media drivers;
- Microchip PCI driver;
- Network drivers;
- Mellanox network drivers;
- STMicroelectronics network drivers;
- PCI subsystem;
-
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vendor_ubuntu·2025-05-20·CVSS 7.8
CVE-2024-57793 [HIGH] Linux kernel (Azure, N-Series) vulnerabilities
Title: Linux kernel (Azure, N-Series) 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:
- RISC-V architecture;
- x86 architecture;
- Block layer subsystem;
- Compute Acceleration Framework;
- ACPI drivers;
- Drivers core;
- Ublk userspace block driver;
- Virtio block driver;
- Bluetooth drivers;
- DMA engine subsystem;
- GPU drivers;
- Microsoft Hyper-V drivers;
- Hardware monitoring drivers;
- IIO ADC drivers;
- IIO subsystem;
- InfiniBand drivers;
- Multiple devices driver;
- Media drivers;
- Microchip PCI driver;
- Network drivers;
- Mellanox network drivers;
- Microsoft Azure
Ubuntu
Linux kernel (Raspberry Pi Real-time) vulnerabilities
vendor_ubuntu·2025-05-20
CVE-2024-57793 Linux kernel (Raspberry Pi Real-time) vulnerabilities
Title: Linux kernel (Raspberry Pi Real-time) 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;
- MIPS architecture;
- PowerPC architecture;
- RISC-V architecture;
- S390 architecture;
- SuperH RISC architecture;
- User-Mode Linux (UML);
- x86 architecture;
- Block layer subsystem;
- Cryptographic API;
- Compute Acceleration Framework;
- ACPI drivers;
- Drivers core;
- RAM backed block device driver;
- Ublk userspace block driver;
- Virtio block driver;
- Compressed RAM block device driver;
- Bluetooth drivers;
- TPM device driver;
- Clock framework and driver
Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2025-05-20·CVSS 7.8
CVE-2024-57793 [HIGH] 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:
- RISC-V architecture;
- x86 architecture;
- Block layer subsystem;
- Compute Acceleration Framework;
- ACPI drivers;
- Drivers core;
- Ublk userspace block driver;
- Virtio block driver;
- DMA engine subsystem;
- GPU drivers;
- Microsoft Hyper-V drivers;
- Hardware monitoring drivers;
- IIO ADC drivers;
- IIO subsystem;
- InfiniBand drivers;
- Multiple devices driver;
- Media drivers;
- Microchip PCI driver;
- Network drivers;
- Mellanox network drivers;
- STMicroelectronics network drivers;
- PCI subsystem;
-
Ubuntu
Linux kernel (GKE) vulnerabilities
vendor_ubuntu·2025-05-16·CVSS 7.8
CVE-2024-57793 [HIGH] Linux kernel (GKE) vulnerabilities
Title: Linux kernel (GKE) 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:
- RISC-V architecture;
- x86 architecture;
- Block layer subsystem;
- Compute Acceleration Framework;
- ACPI drivers;
- Drivers core;
- Ublk userspace block driver;
- Virtio block driver;
- DMA engine subsystem;
- GPU drivers;
- Microsoft Hyper-V drivers;
- Hardware monitoring drivers;
- IIO ADC drivers;
- IIO subsystem;
- InfiniBand drivers;
- Multiple devices driver;
- Media drivers;
- Microchip PCI driver;
- Network drivers;
- Mellanox network drivers;
- STMicroelectronics network drivers;
- PCI subsyst
Ubuntu
Linux kernel (NVIDIA) vulnerabilities
vendor_ubuntu·2025-05-16·CVSS 5.5
CVE-2024-57793 [MEDIUM] Linux kernel (NVIDIA) vulnerabilities
Title: Linux kernel (NVIDIA) 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:
- RISC-V architecture;
- x86 architecture;
- Block layer subsystem;
- Compute Acceleration Framework;
- ACPI drivers;
- Drivers core;
- Ublk userspace block driver;
- Virtio block driver;
- DMA engine subsystem;
- GPU drivers;
- Microsoft Hyper-V drivers;
- Hardware monitoring drivers;
- IIO ADC drivers;
- IIO subsystem;
- InfiniBand drivers;
- Multiple devices driver;
- Media drivers;
- Microchip PCI driver;
- Network drivers;
- Mellanox network drivers;
- STMicroelectronics network drivers;
- PCI subs
Ubuntu
Linux kernel (Real-time) vulnerabilities
vendor_ubuntu·2025-05-16·CVSS 7.1
CVE-2025-21639 [HIGH] Linux kernel (Real-time) vulnerabilities
Title: Linux kernel (Real-time) 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:
- RISC-V architecture;
- x86 architecture;
- Block layer subsystem;
- Compute Acceleration Framework;
- ACPI drivers;
- Drivers core;
- Ublk userspace block driver;
- Virtio block driver;
- DMA engine subsystem;
- GPU drivers;
- Microsoft Hyper-V drivers;
- Hardware monitoring drivers;
- IIO ADC drivers;
- IIO subsystem;
- InfiniBand drivers;
- Multiple devices driver;
- Media drivers;
- Microchip PCI driver;
- Network drivers;
- Mellanox network drivers;
- STMicroelectronics network drivers;
- PCI s
Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2025-05-16·CVSS 7.1
CVE-2024-57793 [HIGH] 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:
- RISC-V architecture;
- x86 architecture;
- Block layer subsystem;
- Compute Acceleration Framework;
- ACPI drivers;
- Drivers core;
- Ublk userspace block driver;
- Virtio block driver;
- DMA engine subsystem;
- GPU drivers;
- Microsoft Hyper-V drivers;
- Hardware monitoring drivers;
- IIO ADC drivers;
- IIO subsystem;
- InfiniBand drivers;
- Multiple devices driver;
- Media drivers;
- Microchip PCI driver;
- Network drivers;
- Mellanox network drivers;
- STMicroelectronics network drivers;
- PCI subsystem;
-
Ubuntu
Linux kernel (Raspberry Pi) vulnerabilities
vendor_ubuntu·2025-04-01
CVE-2024-56761 Linux kernel (Raspberry Pi) vulnerabilities
Title: Linux kernel (Raspberry Pi) 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;
- MIPS architecture;
- PowerPC architecture;
- RISC-V architecture;
- S390 architecture;
- x86 architecture;
- Block layer subsystem;
- Compute Acceleration Framework;
- ACPI drivers;
- Drivers core;
- Ublk userspace block driver;
- Virtio block driver;
- Bluetooth drivers;
- Buffer Sharing and Synchronization framework;
- DMA engine subsystem;
- EFI core;
- GPIO subsystem;
- GPU drivers;
- HID subsystem;
- Microsoft Hyper-V drivers;
- Hardware monitoring drivers;
- I3C subsy
Ubuntu
Linux kernel (Low Latency) vulnerabilities
vendor_ubuntu·2025-03-27
CVE-2024-56582 Linux kernel (Low Latency) vulnerabilities
Title: Linux kernel (Low Latency) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
Attila Szász discovered that the HFS+ file system implementation in the
Linux Kernel contained a heap overflow vulnerability. An attacker could use
a specially crafted file system image that, when mounted, could cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2025-0927)
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;
- MIPS architecture;
- PowerPC architecture;
- RISC-V architecture;
- S390 architecture;
- x86 architecture;
- Block layer subsystem;
- Compute Acceleration Framework;
- ACPI
Ubuntu
Linux kernel (Low Latency) vulnerabilities
vendor_ubuntu·2025-03-27
CVE-2024-56582 Linux kernel (Low Latency) vulnerabilities
Title: Linux kernel (Low Latency) 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;
- MIPS architecture;
- PowerPC architecture;
- RISC-V architecture;
- S390 architecture;
- x86 architecture;
- Block layer subsystem;
- Compute Acceleration Framework;
- ACPI drivers;
- Drivers core;
- Ublk userspace block driver;
- Virtio block driver;
- Bluetooth drivers;
- Buffer Sharing and Synchronization framework;
- DMA engine subsystem;
- EFI core;
- GPIO subsystem;
- GPU drivers;
- HID subsystem;
- Microsoft Hyper-V drivers;
- Hardware monitoring drivers;
- I3C subsys
Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2025-03-27
CVE-2024-56582 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;
- MIPS architecture;
- PowerPC architecture;
- RISC-V architecture;
- S390 architecture;
- x86 architecture;
- Block layer subsystem;
- Compute Acceleration Framework;
- ACPI drivers;
- Drivers core;
- Ublk userspace block driver;
- Virtio block driver;
- Bluetooth drivers;
- Buffer Sharing and Synchronization framework;
- DMA engine subsystem;
- EFI core;
- GPIO subsystem;
- GPU drivers;
- HID subsystem;
- Microsoft Hyper-V drivers;
- Hardware monitoring drivers;
- I3C subsystem;
- IIO ADC
Ubuntu
Linux kernel (OEM) vulnerabilities
vendor_ubuntu·2025-03-27
CVE-2024-56582 Linux kernel (OEM) vulnerabilities
Title: Linux kernel (OEM) 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;
- MIPS architecture;
- PowerPC architecture;
- RISC-V architecture;
- S390 architecture;
- x86 architecture;
- Block layer subsystem;
- Compute Acceleration Framework;
- ACPI drivers;
- Drivers core;
- Ublk userspace block driver;
- Virtio block driver;
- Bluetooth drivers;
- Buffer Sharing and Synchronization framework;
- DMA engine subsystem;
- EFI core;
- GPIO subsystem;
- GPU drivers;
- HID subsystem;
- Microsoft Hyper-V drivers;
- Hardware monitoring drivers;
- I3C subsystem;
- I
Red Hat
kernel: io_uring/eventfd: ensure io_eventfd_signal() defers another RCU period
vendor_redhat·2025-01-20·CVSS 4.7
CVE-2025-21655 [MEDIUM] CWE-362 kernel: io_uring/eventfd: ensure io_eventfd_signal() defers another RCU period
kernel: io_uring/eventfd: ensure io_eventfd_signal() defers another RCU period
In the Linux kernel, the following vulnerability has been resolved:
io_uring/eventfd: ensure io_eventfd_signal() defers another RCU period
io_eventfd_do_signal() is invoked from an RCU callback, but when
dropping the reference to the io_ev_fd, it calls io_eventfd_free()
directly if the refcount drops to zero. This isn't correct, as any
potential freeing of the io_ev_fd should be deferred another RCU grace
period.
Just call io_eventfd_put() rather than open-code the dec-and-test and
free, which will correctly defer it another RCU grace period.
Package: kernel (Red Hat Enterprise Linux 6) - Not affected
Package: kernel (Red Hat Enterprise Linux 7) - Not affected
Package: kernel-rt (Red Hat Enterprise Linux 7)
Debian
CVE-2025-21655: linux - In the Linux kernel, the following vulnerability has been resolved: io_uring/ev...
vendor_debian·2025·CVSS 4.7
CVE-2025-21655 [MEDIUM] CVE-2025-21655: linux - In the Linux kernel, the following vulnerability has been resolved: io_uring/ev...
In the Linux kernel, the following vulnerability has been resolved: io_uring/eventfd: ensure io_eventfd_signal() defers another RCU period io_eventfd_do_signal() is invoked from an RCU callback, but when dropping the reference to the io_ev_fd, it calls io_eventfd_free() directly if the refcount drops to zero. This isn't correct, as any potential freeing of the io_ev_fd should be deferred another RCU grace period. Just call io_eventfd_put() rather than open-code the dec-and-test and free, which will correctly defer it another RCU grace period.
Scope: local
bookworm: resolved (fixed in 6.1.128-1)
bullseye: resolved
forky: resolved (fixed in 6.12.10-1)
sid: resolved (fixed in 6.12.10-1)
trixie: resolved (fixed in 6.12.10-1)
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
https://git.kernel.org/stable/c/6b63308c28987c6010b1180c72a6db4df6c68033https://git.kernel.org/stable/c/8efff2aa2d95dc437ab67c5b4a9f1d3f367baa10https://git.kernel.org/stable/c/a7085c3ae43b86d4b3d1b8275e6a67f14257e3b7https://git.kernel.org/stable/c/c9a40292a44e78f71258b8522655bffaf5753bdbhttps://project-zero.issues.chromium.org/issues/388499293https://lists.debian.org/debian-lts-announce/2025/03/msg00001.htmlhttps://cert-portal.siemens.com/productcert/html/ssa-019113.html
2025-01-20
Published