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NVD / CVE Program· CNA Linux

CVE-2022-49295: nbd: call genl_unregister_family() first in nbd_cleanup()

Noroxi assessment

Priority: Monitor (action score 18/100)

  • 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: 0.25% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: Linux Linux 013a79f1b5c89290e2e97f1ebf14b14e0cf5fe5c, 06c4da89c24e7023ea448cadf8e9daf06a0aae6e, 1be608e1ee1f222464b2856bda9b85ab5184a33e.
  • Severity is disputed: the assigning authority (CNA) scores it 7.0, NVD 4.7.

Low priority for now. Upgrade to Linux Linux 013a79f1b5c89290e2e97f1ebf14b14e0cf5fe5c, 06c4da89c24e7023ea448cadf8e9daf06a0aae6e, 1be608e1ee1f222464b2856bda9b85ab5184a33e 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: call genl_unregister_family() first in nbd_cleanup() Otherwise there may be race between module removal and the handling of netlink command, which can lead to the oops as shown below: BUG: kernel NULL pointer dereference, address: 0000000000000098 Oops: 0002 [#1] SMP PTI CPU: 1 PID: 31299 Comm: nbd-client Tainted: G E 5.14.0-rc4 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) RIP: 0010:down_write+0x1a/0x50 Call Trace: start_creating+0x89/0x130 debugfs_create_dir+0x1b/0x130 nbd_start_device+0x13d/0x390 [nbd] nbd_genl_connect+0x42f/0x748 [nbd] genl_family_rcv_msg_doit.isra.0+0xec/0x150 genl_rcv_msg+0xe5/0x1e0 netlink_rcv_skb+0x55/0x100 genl_rcv+0x29/0x40 netlink_unicast+0x1a8/0x250 netlink_sendmsg+0x21b/0x430 ____sys_sendmsg+0x2a4/0x2d0 ___sys_sendmsg+0x81/0xc0 __sys_sendmsg+0x62/0xb0 __x64_sys_sendmsg+0x1f/0x30 do_syscall_64+0x3b/0xc0 entry_SYSCALL_64_after_hwframe+0x44/0xae Modules linked in: nbd(E-)

MediumCVSS 4.7 · v3.1—No exploit Fix available
Published
Feb 26, 2025
Updated
Aug 5, 2026
EPSS
0.2% · 16th percentile

Report tools

JSON

Action score

18

Monitor

Low priority for now.

CVSS
18 / 40 · 4.7 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
4.7
CNA · Linux
7.0
2.3 point gap

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

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

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2022-49295

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • 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 4.14.283
  • linux linux kernel4.15 and later · before 4.19.247
  • linux linux kernel4.20 and later · before 5.4.198
  • linux linux kernel5.5 and later · before 5.10.122
  • linux linux kernel5.11 and later · before 5.15.47
  • linux linux kernel5.16 and later · before 5.17.15
  • linux linux kernel5.18 and later · before 5.18.4

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
    • e46c7287b1c27683a8e30ca825fb98e2b97f1099 and later · before 8a1435c862ea09b06be7acda325128dc08458e25affected · git
    • e46c7287b1c27683a8e30ca825fb98e2b97f1099 and later · before 013a79f1b5c89290e2e97f1ebf14b14e0cf5fe5caffected · git
    • e46c7287b1c27683a8e30ca825fb98e2b97f1099 and later · before 1be608e1ee1f222464b2856bda9b85ab5184a33eaffected · git
    • e46c7287b1c27683a8e30ca825fb98e2b97f1099 and later · before c0868f6e728c3c28bef0e8bee89d2daf86a8bbcaaffected · git
    • e46c7287b1c27683a8e30ca825fb98e2b97f1099 and later · before cbeafa7a79d08ecdb55f8f1d41a11323d0f709dbaffected · git
    • e46c7287b1c27683a8e30ca825fb98e2b97f1099 and later · before 6f505bbb8063fd3a238a4239d2d8c165e5279f6faffected · git
    • e46c7287b1c27683a8e30ca825fb98e2b97f1099 and later · before 3d5da1ffba3388c2ae2e6c598855a4d887d3bf79affected · git
    • e46c7287b1c27683a8e30ca825fb98e2b97f1099 and later · before 06c4da89c24e7023ea448cadf8e9daf06a0aae6eaffected · 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 5.18.5-15.18.5-1

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-2022-49293Feb 26, 2025 · netfilter: nf_tables: initialize registers in nft_do_chain()
    22Monitor
  • ← EarlierCVE-2022-49294Feb 26, 2025 · drm/amd/display: Check if modulo is 0 before dividing.
    22Monitor
  • Later →CVE-2022-49296Feb 26, 2025 · ceph: fix possible deadlock when holding Fwb to get inline_data
    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 Linux013a79f1b5c89290e2e97f1ebf14b14e0cf5fe5cVendor (CNA)
Linux Linux06c4da89c24e7023ea448cadf8e9daf06a0aae6eVendor (CNA)
Linux Linux1be608e1ee1f222464b2856bda9b85ab5184a33eVendor (CNA)
Linux Linux3d5da1ffba3388c2ae2e6c598855a4d887d3bf79Vendor (CNA)
Linux Linux6f505bbb8063fd3a238a4239d2d8c165e5279f6fVendor (CNA)
Linux Linux8a1435c862ea09b06be7acda325128dc08458e25Vendor (CNA)
Linux Linuxc0868f6e728c3c28bef0e8bee89d2daf86a8bbcaVendor (CNA)
Linux Linuxcbeafa7a79d08ecdb55f8f1d41a11323d0f709dbVendor (CNA)
debian:linux5.18.5-1 · 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.

No history yet (it accumulates with the daily EPSS job).

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.
  • Special conditions such as timing or configuration are required.

If successful

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

Weakness class (CWE)

CWE-476 · NULL Pointer Dereference

CVSS vector

CVSS:3.1/AV:L/AC:H/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