CVE-2022-50314None▾ Sunlit

nbd: Fix hung when signal interrupts nbd_start_device_ioctl()

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 mai…

▾ Sunlit zone — Low / medium · no exploitation signal

Depth score3/ 100 · Minimal

impact 2.8 · likelihood 0 · exploitation 0

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Proof of concept

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Published

Sep 15, 2025

Updated

Nov 5, 2026

CVSS

—

Vendor

Linux

Product

Linux

CWE

—

Depth score

3 · Minimal

EPSS

0.16% · p5

Platforms

—

Source

CVEORG

Vector

—

CISA SSVC

decided 2026-11-05

Exploitation: none
Automatable: no
Technical impact: partial

Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.

EPSS history

Exploit-prediction probability, daily snapshots since Nov 5.

0.2% → 0.2%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

3 events · 416 days

Sep 15, 2025Published
Disclosed via CVEORG
Nov 5, 2026Record revised
Last analysed / modified upstream
Nov 5, 2026EPSS first tracked
0.2%

Linux #cve.org

Affected

Linux >= 5ea8d10802ec4c153a6e21eebaf412e2abd29736 < 3ba3846cb3e2fb3c6fbf79e998472821b298419e
Linux >= 5ea8d10802ec4c153a6e21eebaf412e2abd29736 < c7b4641bd2395c2f3cd3b0a0cbf292ed9d489398
Linux >= 5ea8d10802ec4c153a6e21eebaf412e2abd29736 < 3575949513ea3b387b30dac1e69468a923c86caf
Linux >= 5ea8d10802ec4c153a6e21eebaf412e2abd29736 < b2700f98b3f4dd19fb4315b70581e5caff89eb49
Linux >= 5ea8d10802ec4c153a6e21eebaf412e2abd29736 < c0d73be0af8c1310713bc39a8d7a22e35084e14f
Linux >= 5ea8d10802ec4c153a6e21eebaf412e2abd29736 < 62006a72b05e0d38727eef5188700f2488be5e89
Linux >= 5ea8d10802ec4c153a6e21eebaf412e2abd29736 < 35fb7d4a53d9e36d1b91161ea9870d9c6d57dccf
Linux >= 5ea8d10802ec4c153a6e21eebaf412e2abd29736 < 1de7c3cf48fc41cd95adb12bd1ea9033a917798a
Linux 4.12

Full technical detail▾

Overview

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().

Affected

Linux >= 5ea8d10802ec4c153a6e21eebaf412e2abd29736 < 3ba3846cb3e2fb3c6fbf79e998472821b298419e
Linux >= 5ea8d10802ec4c153a6e21eebaf412e2abd29736 < c7b4641bd2395c2f3cd3b0a0cbf292ed9d489398
Linux >= 5ea8d10802ec4c153a6e21eebaf412e2abd29736 < 3575949513ea3b387b30dac1e69468a923c86caf
Linux >= 5ea8d10802ec4c153a6e21eebaf412e2abd29736 < b2700f98b3f4dd19fb4315b70581e5caff89eb49
Linux >= 5ea8d10802ec4c153a6e21eebaf412e2abd29736 < c0d73be0af8c1310713bc39a8d7a22e35084e14f
Linux >= 5ea8d10802ec4c153a6e21eebaf412e2abd29736 < 62006a72b05e0d38727eef5188700f2488be5e89
Linux >= 5ea8d10802ec4c153a6e21eebaf412e2abd29736 < 35fb7d4a53d9e36d1b91161ea9870d9c6d57dccf
Linux >= 5ea8d10802ec4c153a6e21eebaf412e2abd29736 < 1de7c3cf48fc41cd95adb12bd1ea9033a917798a
Linux 4.12

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

References

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#cve.org

nbd: Fix hung when signal interrupts nbd_start_device_ioctl()

▾ Sunlit zone — Low / medium · no exploitation signal

Depth score3/ 100 · Minimal

impact 2.8 · likelihood 0 · exploitation 0

Overview

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().

Affected

Linux >= 5ea8d10802ec4c153a6e21eebaf412e2abd29736 < 3ba3846cb3e2fb3c6fbf79e998472821b298419e

Linux >= 5ea8d10802ec4c153a6e21eebaf412e2abd29736 < c7b4641bd2395c2f3cd3b0a0cbf292ed9d489398

Linux >= 5ea8d10802ec4c153a6e21eebaf412e2abd29736 < 3575949513ea3b387b30dac1e69468a923c86caf

Linux >= 5ea8d10802ec4c153a6e21eebaf412e2abd29736 < b2700f98b3f4dd19fb4315b70581e5caff89eb49

Linux >= 5ea8d10802ec4c153a6e21eebaf412e2abd29736 < c0d73be0af8c1310713bc39a8d7a22e35084e14f

Linux >= 5ea8d10802ec4c153a6e21eebaf412e2abd29736 < 62006a72b05e0d38727eef5188700f2488be5e89

Linux >= 5ea8d10802ec4c153a6e21eebaf412e2abd29736 < 35fb7d4a53d9e36d1b91161ea9870d9c6d57dccf

Linux >= 5ea8d10802ec4c153a6e21eebaf412e2abd29736 < 1de7c3cf48fc41cd95adb12bd1ea9033a917798a

Linux 4.12