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NVD / CVE Program· CNA Linux

CVE-2022-50314: nbd: Fix hung when signal interrupts nbd_start_device_ioctl()

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.16% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 1de7c3cf48fc41cd95adb12bd1ea9033a917798a, 3575949513ea3b387b30dac1e69468a923c86caf, 35fb7d4a53d9e36d1b91161ea9870d9c6d57dccf.

Low priority for now. Upgrade to Linux Linux 1de7c3cf48fc41cd95adb12bd1ea9033a917798a, 3575949513ea3b387b30dac1e69468a923c86caf, 35fb7d4a53d9e36d1b91161ea9870d9c6d57dccf or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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().

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Sep 15, 2025
Updated
Jun 17, 2026
EPSS
0.1% · 5th percentile
CWE
—

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernelbefore 4.14.296
  • linux linux kernel4.15 and later · before 4.19.262
  • linux linux kernel4.20 and later · before 5.4.220
  • linux linux kernel5.5 and later · before 5.10.150
  • linux linux kernel5.11 and later · before 5.15.75
  • linux linux kernel5.16 and later · before 5.19.17
  • linux linux kernel6.0 and later · before 6.0.3

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 4.12affected
    • 5ea8d10802ec4c153a6e21eebaf412e2abd29736 and later · before 3ba3846cb3e2fb3c6fbf79e998472821b298419eaffected · git
    • 5ea8d10802ec4c153a6e21eebaf412e2abd29736 and later · before c7b4641bd2395c2f3cd3b0a0cbf292ed9d489398affected · git
    • 5ea8d10802ec4c153a6e21eebaf412e2abd29736 and later · before 3575949513ea3b387b30dac1e69468a923c86cafaffected · git
    • 5ea8d10802ec4c153a6e21eebaf412e2abd29736 and later · before b2700f98b3f4dd19fb4315b70581e5caff89eb49affected · git
    • 5ea8d10802ec4c153a6e21eebaf412e2abd29736 and later · before c0d73be0af8c1310713bc39a8d7a22e35084e14faffected · git
    • 5ea8d10802ec4c153a6e21eebaf412e2abd29736 and later · before 62006a72b05e0d38727eef5188700f2488be5e89affected · git
    • 5ea8d10802ec4c153a6e21eebaf412e2abd29736 and later · before 35fb7d4a53d9e36d1b91161ea9870d9c6d57dccfaffected · git
    • 5ea8d10802ec4c153a6e21eebaf412e2abd29736 and later · before 1de7c3cf48fc41cd95adb12bd1ea9033a917798aaffected · git
    • before 4.12not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.0.3-16.0.3-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2022-50312Sep 15, 2025 · drivers: serial: jsm: fix some leaks in probe
    22Monitor
  • ← EarlierCVE-2022-50313Sep 15, 2025 · erofs: fix order >= MAX_ORDER warning due to crafted negative i_size
    22Monitor
  • Later →CVE-2022-50316Sep 15, 2025 · orangefs: Fix kmemleak in orangefs_sysfs_init()
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux1de7c3cf48fc41cd95adb12bd1ea9033a917798aVendor (CNA)
Linux Linux3575949513ea3b387b30dac1e69468a923c86cafVendor (CNA)
Linux Linux35fb7d4a53d9e36d1b91161ea9870d9c6d57dccfVendor (CNA)
Linux Linux3ba3846cb3e2fb3c6fbf79e998472821b298419eVendor (CNA)
Linux Linux62006a72b05e0d38727eef5188700f2488be5e89Vendor (CNA)
Linux Linuxb2700f98b3f4dd19fb4315b70581e5caff89eb49Vendor (CNA)
Linux Linuxc0d73be0af8c1310713bc39a8d7a22e35084e14fVendor (CNA)
Linux Linuxc7b4641bd2395c2f3cd3b0a0cbf292ed9d489398Vendor (CNA)
debian:linux6.0.3-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records