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NVD / CVE Program· CNA Linux

CVE-2022-50402: drivers/md/md-bitmap: check the return value of md_bitmap_get_counter()

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 100caacfa0ed26e061954c90cdc835d42f709536, 21e9aac9a74d30907d44bae0d24c036cb3819406, 3bd548e5b819b8c0f2c9085de775c5c7bff9052f.

Low priority for now. Upgrade to Linux Linux 100caacfa0ed26e061954c90cdc835d42f709536, 21e9aac9a74d30907d44bae0d24c036cb3819406, 3bd548e5b819b8c0f2c9085de775c5c7bff9052f 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: drivers/md/md-bitmap: check the return value of md_bitmap_get_counter() Check the return value of md_bitmap_get_counter() in case it returns NULL pointer, which will result in a null pointer dereference. v2: update the check to include other dereference

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Sep 18, 2025
Updated
Jun 17, 2026
EPSS
0.1% · 5th percentile

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%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

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-2022-50402

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 kernel3.5 and later · before 4.19.270
  • linux linux kernel4.20 and later · before 5.4.229
  • linux linux kernel5.5 and later · before 5.10.163
  • linux linux kernel5.11 and later · before 5.15.86
  • linux linux kernel5.16 and later · before 6.0.16
  • linux linux kernel6.1 and later · before 6.1.2

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

    • 3.5affected
    • d60b479d177a5735b6b4db6ee5280ef6653f50e7 and later · before 21e9aac9a74d30907d44bae0d24c036cb3819406affected · git
    • d60b479d177a5735b6b4db6ee5280ef6653f50e7 and later · before 5d8d046f3dba939e74e2414f009df426700430edaffected · git
    • d60b479d177a5735b6b4db6ee5280ef6653f50e7 and later · before 100caacfa0ed26e061954c90cdc835d42f709536affected · git
    • d60b479d177a5735b6b4db6ee5280ef6653f50e7 and later · before b621d17fe8b079574c773800148fb86907f3445daffected · git
    • d60b479d177a5735b6b4db6ee5280ef6653f50e7 and later · before ff3b7e12bc9f50de05c9d82b5b79e23e5be888f1affected · git
    • d60b479d177a5735b6b4db6ee5280ef6653f50e7 and later · before 99bef41f8e8d1d52b5cb34f2f193f1346192752baffected · git
    • d60b479d177a5735b6b4db6ee5280ef6653f50e7 and later · before 3bd548e5b819b8c0f2c9085de775c5c7bff9052faffected · git
    • before 3.5not affected · semver
    • 4.19.270 and later · up to and including 4.19.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.4-16.1.4-1

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-2023-53418Sep 18, 2025 · USB: gadget: lpc32xx_udc: fix memory leak with using debugfs_lookup()
    22Monitor
  • ← EarlierCVE-2022-50401Sep 18, 2025 · nfsd: under NFSv4.1, fix double svc_xprt_put on rpc_create failure
    31Monitor
  • Later →CVE-2022-50404Sep 18, 2025 · fbdev: fbcon: release buffer when fbcon_do_set_font() failed
    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 Linux100caacfa0ed26e061954c90cdc835d42f709536Vendor (CNA)
Linux Linux21e9aac9a74d30907d44bae0d24c036cb3819406Vendor (CNA)
Linux Linux3bd548e5b819b8c0f2c9085de775c5c7bff9052fVendor (CNA)
Linux Linux5d8d046f3dba939e74e2414f009df426700430edVendor (CNA)
Linux Linux99bef41f8e8d1d52b5cb34f2f193f1346192752bVendor (CNA)
Linux Linuxb621d17fe8b079574c773800148fb86907f3445dVendor (CNA)
Linux Linuxff3b7e12bc9f50de05c9d82b5b79e23e5be888f1Vendor (CNA)
debian:linux6.1.4-1 · 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)

CWE-476 · NULL Pointer Dereference

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 (6 more)

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

All records