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NVD / CVE Program· CNA Linux

CVE-2025-37844: cifs: avoid NULL pointer dereference in dbg call

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: 0.29% (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 20048e658652e731f5cadf4a695925e570ca0ff9, 5.7, 6c14ee6af8f1f188b668afd6d003f7516a507b08; azl3 kernel 6.6.85.1-4 on Azure Linux 3.0 6.6.92.2-1; azl3 kernel 6.6.92.2-1 on Azure Linux 3.0 6.6.92.2-1.

Low priority for now. Upgrade to Linux Linux 20048e658652e731f5cadf4a695925e570ca0ff9, 5.7, 6c14ee6af8f1f188b668afd6d003f7516a507b08; azl3 kernel 6.6.85.1-4 on Azure Linux 3.0 6.6.92.2-1; azl3 kernel 6.6.92.2-1 on Azure Linux 3.0 6.6.92.2-1 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: cifs: avoid NULL pointer dereference in dbg call cifs_server_dbg() implies server to be non-NULL so move call under condition to avoid NULL pointer dereference. Found by Linux Verification Center (linuxtesting.org) with SVACE.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 9, 2025
Updated
Jun 17, 2026
EPSS
0.2% · 22th 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 · 0.2%

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-2025-37844

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
debiandebian linux

Affected versions

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

  • debian debian linux11.0
  • linux linux kernel5.11 and later · before 5.15.181
  • linux linux kernel5.16 and later · before 6.1.135
  • linux linux kernel6.2 and later · before 6.6.88
  • linux linux kernel5.6.7 and later · before 5.10.237
  • linux linux kernel6.13 and later · before 6.13.12
  • linux linux kernel6.14 and later · before 6.14.3
  • linux linux kernel6.7 and later · before 6.12.24

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

    • 53e83828d352304fec5e19751f38ed8c65e6ec2f, 5.7affected
    • e79b0332ae06b4895dcecddf4bbc5d3917e9383c and later · before ba3ce6c60cd5db258687dfeba9fc608f5e7cadf3affected · git
    • e79b0332ae06b4895dcecddf4bbc5d3917e9383c and later · before 9c9000cb91b986eb7f75835340c67857ab97c09baffected · git
    • e79b0332ae06b4895dcecddf4bbc5d3917e9383c and later · before b2a1833e1c63e2585867ebeaf4dd41494dcede4baffected · git
    • e79b0332ae06b4895dcecddf4bbc5d3917e9383c and later · before 864ba5c651b03830f36f0906c21af05b15c1aaa6affected · git
    • e79b0332ae06b4895dcecddf4bbc5d3917e9383c and later · before e0717385f5c51e290c2cd2ad4699a778316b5132affected · git
    • e79b0332ae06b4895dcecddf4bbc5d3917e9383c and later · before 20048e658652e731f5cadf4a695925e570ca0ff9affected · git
    • e79b0332ae06b4895dcecddf4bbc5d3917e9383c and later · before 6c14ee6af8f1f188b668afd6d003f7516a507b08affected · git
    • e79b0332ae06b4895dcecddf4bbc5d3917e9383c and later · before b4885bd5935bb26f0a414ad55679a372e53f9b9baffected · git
    • 5.6.7 and later · before 5.7affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.135-16.1.135-1
Debian:13linuxbefore 6.12.25-16.12.25-1

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-2025-37841May 9, 2025 · pm: cpupower: bench: Prevent NULL dereference on malloc failure
    22Monitor
  • ← EarlierCVE-2025-37843May 9, 2025 · PCI: pciehp: Avoid unnecessary device replacement check
    22Monitor
  • Later →CVE-2025-37845May 9, 2025 · tracing: fprobe events: Fix possible UAF on modules
    31Monitor

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 Linux20048e658652e731f5cadf4a695925e570ca0ff9Vendor (CNA)
Linux Linux5.7Vendor (CNA)
Linux Linux6c14ee6af8f1f188b668afd6d003f7516a507b08Vendor (CNA)
Linux Linux864ba5c651b03830f36f0906c21af05b15c1aaa6Vendor (CNA)
Linux Linux9c9000cb91b986eb7f75835340c67857ab97c09bVendor (CNA)
Linux Linuxb2a1833e1c63e2585867ebeaf4dd41494dcede4bVendor (CNA)
Linux Linuxb4885bd5935bb26f0a414ad55679a372e53f9b9bVendor (CNA)
Linux Linuxba3ce6c60cd5db258687dfeba9fc608f5e7cadf3Vendor (CNA)
Linux Linuxe0717385f5c51e290c2cd2ad4699a778316b5132Vendor (CNA)
azl3 kernel 6.6.85.1-4 on Azure Linux 3.06.6.92.2-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 kernel 6.6.92.2-1 on Azure Linux 3.06.6.92.2-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.135-1 · 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.
  • 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 (9 more)

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

All records