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CVE-2023-53006· NVD / CVE Program· CNA Linux

cifs: Fix oops due to uncleared server->smbd_conn in reconnect

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: 0.55% (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.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: Linux Linux 4b83bc6f87eedab4599b0123e572a422689444be, 5109607a4ece7cd8536172bf7549eb4dce1f3576, 91be54849d5392050f5b847b42bd5e6221551ac8.
  • Severity is disputed: the assigning authority (CNA) scores it 9.8, NVD 5.5.

Low priority for now. Upgrade to Linux Linux 4b83bc6f87eedab4599b0123e572a422689444be, 5109607a4ece7cd8536172bf7549eb4dce1f3576, 91be54849d5392050f5b847b42bd5e6221551ac8 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: Fix oops due to uncleared server->smbd_conn in reconnect In smbd_destroy(), clear the server->smbd_conn pointer after freeing the smbd_connection struct that it points to so that reconnection doesn't get confused.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Mar 27, 2025
Updated
Oct 15, 2026
EPSS
0.5% · 45th 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 · 0.5%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
5.5
CNA · Linux
9.8
4.3 point gap

CVSS:3.1/AV:N/AC:L/PR:N/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-2023-53006

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 kernel4.16 and later · before 4.19.272
  • linux linux kernel4.20 and later · before 5.4.231
  • linux linux kernel5.5 and later · before 5.10.166
  • linux linux kernel5.11 and later · before 5.15.91
  • linux linux kernel5.16 and later · before 6.1.9
  • linux linux kernel6.2

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

    • 4.16affected
    • 8ef130f9ec27973f7b49e20c5a3b9134ca33026c and later · before a9640c0b268405f2540e8203a545e930ea88bb7daffected · git
    • 8ef130f9ec27973f7b49e20c5a3b9134ca33026c and later · before 91be54849d5392050f5b847b42bd5e6221551ac8affected · git
    • 8ef130f9ec27973f7b49e20c5a3b9134ca33026c and later · before e037baee16e0b9ace7e730888fcae9cec11daff2affected · git
    • 8ef130f9ec27973f7b49e20c5a3b9134ca33026c and later · before 4b83bc6f87eedab4599b0123e572a422689444beaffected · git
    • 8ef130f9ec27973f7b49e20c5a3b9134ca33026c and later · before 5109607a4ece7cd8536172bf7549eb4dce1f3576affected · git
    • 8ef130f9ec27973f7b49e20c5a3b9134ca33026c and later · before b7ab9161cf5ddc42a288edf9d1a61f3bdffe17c7affected · git
    • before 4.16not affected · semver
    • 4.19.272 and later · up to and including 4.19.*not affected · semver
    • 5.4.231 and later · up to and including 5.4.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.11-16.1.11-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • 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
  • CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV
    83Now

Published before and after this one in the same product

  • ← EarlierCVE-2023-52981Mar 27, 2025 · drm/i915: Fix request ref counting during error capture & debugfs dump
    22Monitor
  • ← EarlierCVE-2023-52987Mar 27, 2025 · ASoC: SOF: ipc4-mtrace: prevent underflow in sof_ipc4_priority_mask_dfs_write()
    31Monitor
  • Later →CVE-2023-53009Mar 27, 2025 · drm/amdkfd: Add sync after creating vram bo
    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 Linux4b83bc6f87eedab4599b0123e572a422689444beVendor (CNA)
Linux Linux5109607a4ece7cd8536172bf7549eb4dce1f3576Vendor (CNA)
Linux Linux91be54849d5392050f5b847b42bd5e6221551ac8Vendor (CNA)
Linux Linuxa9640c0b268405f2540e8203a545e930ea88bb7dVendor (CNA)
Linux Linuxb7ab9161cf5ddc42a288edf9d1a61f3bdffe17c7Vendor (CNA)
Linux Linuxe037baee16e0b9ace7e730888fcae9cec11daff2Vendor (CNA)
debian:linux6.1.11-1 · 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. SSVC exploitation— → none
  2. Fix✗ → ✓

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

References

Show all references (5 more)

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

All records