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CVE-2023-53330· NVD / CVE Program· CNA Linux

caif: fix memory leak in cfctrl_linkup_request()

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: 0.14% (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 1dddeceb26002cfea4c375e92ac6498768dc7349, 33df9c5d5e2a18c70f5f5f3c2757d654c1b6ffa3, 3acf3783a84cbdf0c9f8cf2f32ee9c49af93a2da.

Low priority for now. Upgrade to Linux Linux 1dddeceb26002cfea4c375e92ac6498768dc7349, 33df9c5d5e2a18c70f5f5f3c2757d654c1b6ffa3, 3acf3783a84cbdf0c9f8cf2f32ee9c49af93a2da 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: caif: fix memory leak in cfctrl_linkup_request() When linktype is unknown or kzalloc failed in cfctrl_linkup_request(), pkt is not released. Add release process to error path.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Sep 16, 2025
Updated
Jun 17, 2026
EPSS
0.1% · 3th 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-2023-53330

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 kernel2.6.35 and later · before 4.14.303
  • linux linux kernel4.15 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 5.15.87
  • linux linux kernel5.16 and later · before 6.0.19
  • linux linux kernel6.1 and later · before 6.1.5
  • 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

    • 2.6.35affected
    • 5.4.229 and later · up to and including 5.4.*not affected · semver
    • b482cd2053e3b90a7b33a78c63cdb6badf2ec383 and later · before badea57569db04b010e922e29a7aaf40a979a70baffected · git
    • b482cd2053e3b90a7b33a78c63cdb6badf2ec383 and later · before 3acf3783a84cbdf0c9f8cf2f32ee9c49af93a2daaffected · git
    • b482cd2053e3b90a7b33a78c63cdb6badf2ec383 and later · before 33df9c5d5e2a18c70f5f5f3c2757d654c1b6ffa3affected · git
    • b482cd2053e3b90a7b33a78c63cdb6badf2ec383 and later · before 84b2cc7b36b7f6957d307fb3d01603f93cb2d655affected · git
    • b482cd2053e3b90a7b33a78c63cdb6badf2ec383 and later · before dc1bc903970bdf63ca40ab923d3ccb765da9a8d9affected · git
    • b482cd2053e3b90a7b33a78c63cdb6badf2ec383 and later · before 1dddeceb26002cfea4c375e92ac6498768dc7349affected · git
    • b482cd2053e3b90a7b33a78c63cdb6badf2ec383 and later · before 3ad47c8aa5648226184415e4a0cb1bf67ffbfd48affected · git
    • b482cd2053e3b90a7b33a78c63cdb6badf2ec383 and later · before fe69230f05897b3de758427b574fc98025dfc907affected · git

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.7-16.1.7-1

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
  • CVE-2019-13272In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to creKEV
    77This week
  • CVE-2013-6282The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the v6k and v7 ARM platforms do not validate certain addKEV
    77This week
  • CVE-2013-2094The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9 uses an incorrect integer data type, which allows loKEV
    77This week

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 Linux1dddeceb26002cfea4c375e92ac6498768dc7349Vendor (CNA)
Linux Linux33df9c5d5e2a18c70f5f5f3c2757d654c1b6ffa3Vendor (CNA)
Linux Linux3acf3783a84cbdf0c9f8cf2f32ee9c49af93a2daVendor (CNA)
Linux Linux3ad47c8aa5648226184415e4a0cb1bf67ffbfd48Vendor (CNA)
Linux Linux84b2cc7b36b7f6957d307fb3d01603f93cb2d655Vendor (CNA)
Linux Linuxbadea57569db04b010e922e29a7aaf40a979a70bVendor (CNA)
Linux Linuxdc1bc903970bdf63ca40ab923d3ccb765da9a8d9Vendor (CNA)
Linux Linuxfe69230f05897b3de758427b574fc98025dfc907Vendor (CNA)
debian:linux6.1.7-1 · 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-401 · Missing Release of Memory after Effective Lifetime

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