CVE-2022-50314
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-15

Last updated on: 2025-12-04

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: nbd: Fix hung when signal interrupts nbd_start_device_ioctl() syzbot reported hung task [1]. The following program is a simplified version of the reproducer: int main(void) { int sv[2], fd; if (socketpair(AF_UNIX, SOCK_STREAM, 0, sv) < 0) return 1; if ((fd = open("/dev/nbd0", 0)) < 0) return 1; if (ioctl(fd, NBD_SET_SIZE_BLOCKS, 0x81) < 0) return 1; if (ioctl(fd, NBD_SET_SOCK, sv[0]) < 0) return 1; if (ioctl(fd, NBD_DO_IT) < 0) return 1; return 0; } When signal interrupt nbd_start_device_ioctl() waiting the condition atomic_read(&config->recv_threads) == 0, the task can hung because it waits the completion of the inflight IOs. This patch fixes the issue by clearing queue, not just shutdown, when signal interrupt nbd_start_device_ioctl().
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Meta Information
Published
2025-09-15
Last Modified
2025-12-04
Generated
2026-05-07
AI Q&A
2025-09-15
EPSS Evaluated
2026-05-05
NVD
CVE-2022-50314
Affected Vendors & Products
Showing 7 associated CPEs
Vendor Product Version / Range
linux linux_kernel to 4.14.296 (exc)
linux linux_kernel From 4.15 (inc) to 4.19.262 (exc)
linux linux_kernel From 4.20 (inc) to 5.4.220 (exc)
linux linux_kernel From 5.5 (inc) to 5.10.150 (exc)
linux linux_kernel From 5.11 (inc) to 5.15.75 (exc)
linux linux_kernel From 5.16 (inc) to 5.19.17 (exc)
linux linux_kernel From 6.0 (inc) to 6.0.3 (exc)
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Exploitability
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CWE ID Description
CWE-NVD-CWE-noinfo
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AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability is a hang issue in the Linux kernel's Network Block Device (nbd) subsystem. Specifically, when a signal interrupts the function nbd_start_device_ioctl() while it is waiting for a condition related to recv_threads to be zero, the task can hang because it waits indefinitely for the completion of inflight IO operations. The problem occurs because the queue is not properly cleared on signal interrupt, only shut down, causing the hang. The fix involves clearing the queue to prevent the hang.


How can this vulnerability impact me? :

This vulnerability can cause the affected Linux system to hang or become unresponsive when using the nbd subsystem under certain conditions involving signal interrupts. This can lead to denial of service or system instability, impacting availability of services relying on nbd devices.


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