CVE-2022-50314

nbd: Fix hung when signal interrupts nbd_start_device_ioctl()

Published Sep 15, 2025 CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed

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().

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`5ea8d10802ec4c153a6e21eebaf412e2abd29736`	affected	< 3ba3846cb3e2fb3c6fbf79e998472821b298419e
`5ea8d10802ec4c153a6e21eebaf412e2abd29736`	affected	< c7b4641bd2395c2f3cd3b0a0cbf292ed9d489398
`5ea8d10802ec4c153a6e21eebaf412e2abd29736`	affected	< 3575949513ea3b387b30dac1e69468a923c86caf
`5ea8d10802ec4c153a6e21eebaf412e2abd29736`	affected	< b2700f98b3f4dd19fb4315b70581e5caff89eb49
`5ea8d10802ec4c153a6e21eebaf412e2abd29736`	affected	< c0d73be0af8c1310713bc39a8d7a22e35084e14f
`5ea8d10802ec4c153a6e21eebaf412e2abd29736`	affected	< 62006a72b05e0d38727eef5188700f2488be5e89
`5ea8d10802ec4c153a6e21eebaf412e2abd29736`	affected	< 35fb7d4a53d9e36d1b91161ea9870d9c6d57dccf
`5ea8d10802ec4c153a6e21eebaf412e2abd29736`	affected	< 1de7c3cf48fc41cd95adb12bd1ea9033a917798a

Linux

affected

Version	Status	Constraints
`4.12`	affected	—
`0`	unaffected	< 4.12
`4.14.296`	unaffected	≤ 4.14.*
`4.19.262`	unaffected	≤ 4.19.*
`5.4.220`	unaffected	≤ 5.4.*
`5.10.150`	unaffected	≤ 5.10.*
`5.15.75`	unaffected	≤ 5.15.*
`5.19.17`	unaffected	≤ 5.19.*
`6.0.3`	unaffected	≤ 6.0.*
`6.1`	unaffected	≤ *

Configuration 1 [-]

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::

No data.

Vendor	Product	Versions
Linux	Linux Kernel	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

Source	ID	Title
EUVD	EUVD-2022-55541	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().

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.160% probability within 30 days)

Exploitation none

Automatable no

Technical Impact partial

References

Link	Providers
https://git.kernel.org/stable/c/1de7c3cf48fc41cd95adb12bd1ea9033a917798a
https://git.kernel.org/stable/c/3575949513ea3b387b30dac1e69468a923c86caf
https://git.kernel.org/stable/c/35fb7d4a53d9e36d1b91161ea9870d9c6d57dccf
https://git.kernel.org/stable/c/3ba3846cb3e2fb3c6fbf79e998472821b298419e
https://git.kernel.org/stable/c/62006a72b05e0d38727eef5188700f2488be5e89
https://git.kernel.org/stable/c/b2700f98b3f4dd19fb4315b70581e5caff89eb49
https://git.kernel.org/stable/c/c0d73be0af8c1310713bc39a8d7a22e35084e14f
https://git.kernel.org/stable/c/c7b4641bd2395c2f3cd3b0a0cbf292ed9d489398
https://lore.kernel.org/linux-cve-announce/2025091500-CVE-2022-50314-9a10@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2022-50314
https://www.cve.org/CVERecord?id=CVE-2022-50314

History

Nov 6, 2026 7:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Dec 4, 2025 3:30 PM Weaknesses updated. Affected versions updated. Scoring metrics updated View changes

Type	Values Removed	Values Added
Weaknesses		NVD-CWE-noinfo
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Metrics	cvssV3_1 `{'score': 7.0, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}`	cvssV3_1 `{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}`

Sep 17, 2025 11:00 AM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Linux Linux linux Kernel
Vendors & Products		Linux Linux linux Kernel

Sep 16, 2025 12:15 AM Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
References		https://lore.kernel.org/linux-cve-announce/2025091500-CVE-2022-50314-9a10@gregkh/T https://nvd.nist.gov/vuln/detail/CVE-2022-50314 https://www.cve.org/CVERecord?id=CVE-2022-50314
Metrics	threat_severity `None`	cvssV3_1 `{'score': 7.0, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}` threat_severity `Important`

Sep 15, 2025 3:00 PM Description updated. Title updated. Added references View changes

Type	Values Removed	Values Added
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().
Title		nbd: Fix hung when signal interrupts nbd_start_device_ioctl()
References		https://git.kernel.org/stable/c/1de7c3cf48fc41cd95adb12bd1ea9033a917798a https://git.kernel.org/stable/c/3575949513ea3b387b30dac1e69468a923c86caf https://git.kernel.org/stable/c/35fb7d4a53d9e36d1b91161ea9870d9c6d57dccf https://git.kernel.org/stable/c/3ba3846cb3e2fb3c6fbf79e998472821b298419e https://git.kernel.org/stable/c/62006a72b05e0d38727eef5188700f2488be5e89 https://git.kernel.org/stable/c/b2700f98b3f4dd19fb4315b70581e5caff89eb49 https://git.kernel.org/stable/c/c0d73be0af8c1310713bc39a8d7a22e35084e14f https://git.kernel.org/stable/c/c7b4641bd2395c2f3cd3b0a0cbf292ed9d489398