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NVD / CVE Program· CNA Linux

CVE-2023-53276: ubifs: Free memory for tmpfile name

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 107d481642c356a5668058066360fc473911e628, 1e43d4284bdc3bd34bd770fea13910ac37ab0618, 1fb815b38bb31d6af9bd0540b8652a0d6fe6cfd3.

Low priority for now. Upgrade to Linux Linux 107d481642c356a5668058066360fc473911e628, 1e43d4284bdc3bd34bd770fea13910ac37ab0618, 1fb815b38bb31d6af9bd0540b8652a0d6fe6cfd3 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: ubifs: Free memory for tmpfile name When opening a ubifs tmpfile on an encrypted directory, function fscrypt_setup_filename allocates memory for the name that is to be stored in the directory entry, but after the name has been copied to the directory entry inode, the memory is not freed. When running kmemleak on it we see that it is registered as a leak. The report below is triggered by a simple program 'tmpfile' just opening a tmpfile: unreferenced object 0xffff88810178f380 (size 32): comm "tmpfile", pid 509, jiffies 4294934744 (age 1524.742s) backtrace: __kmem_cache_alloc_node __kmalloc fscrypt_setup_filename ubifs_tmpfile vfs_tmpfile path_openat Free this memory after it has been copied to the inode.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Sep 16, 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-2023-53276

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 4.14.315
  • linux linux kernel4.15 and later · before 4.19.283
  • linux linux kernel4.20 and later · before 5.4.243
  • linux linux kernel5.5 and later · before 5.10.180
  • linux linux kernel5.11 and later · before 5.15.111
  • linux linux kernel5.16 and later · before 6.1.28
  • linux linux kernel6.2 and later · before 6.2.15
  • linux linux kernel6.3 and later · before 6.3.2

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

    • 4.10affected
    • f4f61d2cc6d8789a52245a4733b3e5643be154f3 and later · before 8ad8c67a897e68426e85990ebfe0a7d1f71fc79faffected · git
    • f4f61d2cc6d8789a52245a4733b3e5643be154f3 and later · before 107d481642c356a5668058066360fc473911e628affected · git
    • f4f61d2cc6d8789a52245a4733b3e5643be154f3 and later · before 823f554747f8aafaa965fb2f3ae794110ed429efaffected · git
    • f4f61d2cc6d8789a52245a4733b3e5643be154f3 and later · before b8f444a4fadfb5070ed7e298e0a5ceb4a18014f3affected · git
    • f4f61d2cc6d8789a52245a4733b3e5643be154f3 and later · before ce840284929b75dbbf062e0ce7fcb78a63b08b5eaffected · git
    • f4f61d2cc6d8789a52245a4733b3e5643be154f3 and later · before 29738e1bcc799dd754711d4e4aab967f0c018175affected · git
    • f4f61d2cc6d8789a52245a4733b3e5643be154f3 and later · before fd197308c0e4f738c7ea687d5332035c5753881caffected · git
    • f4f61d2cc6d8789a52245a4733b3e5643be154f3 and later · before 1e43d4284bdc3bd34bd770fea13910ac37ab0618affected · git
    • f4f61d2cc6d8789a52245a4733b3e5643be154f3 and later · before 1fb815b38bb31d6af9bd0540b8652a0d6fe6cfd3affected · git

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.37-16.1.37-1
Debian:13linuxbefore 6.3.7-16.3.7-1

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-2023-53274Sep 16, 2025 · clk: mediatek: mt8183: Add back SSPM related clocks
    31Monitor
  • ← EarlierCVE-2023-53275Sep 16, 2025 · ALSA: hda: fix a possible null-pointer dereference due to data race in snd_hdac_regmap_sync()
    22Monitor
  • Later →CVE-2023-53277Sep 16, 2025 · wifi: iwl3945: Add missing check for create_singlethread_workqueue
    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 Linux107d481642c356a5668058066360fc473911e628Vendor (CNA)
Linux Linux1e43d4284bdc3bd34bd770fea13910ac37ab0618Vendor (CNA)
Linux Linux1fb815b38bb31d6af9bd0540b8652a0d6fe6cfd3Vendor (CNA)
Linux Linux29738e1bcc799dd754711d4e4aab967f0c018175Vendor (CNA)
Linux Linux823f554747f8aafaa965fb2f3ae794110ed429efVendor (CNA)
Linux Linux8ad8c67a897e68426e85990ebfe0a7d1f71fc79fVendor (CNA)
Linux Linuxb8f444a4fadfb5070ed7e298e0a5ceb4a18014f3Vendor (CNA)
Linux Linuxce840284929b75dbbf062e0ce7fcb78a63b08b5eVendor (CNA)
Linux Linuxfd197308c0e4f738c7ea687d5332035c5753881cVendor (CNA)
debian:linux6.1.37-1 · 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-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 (8 more)

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

All records