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NVD / CVE Program· CNA Linux

CVE-2023-54050: ubifs: Fix memleak when insert_old_idx() failed

Noroxi assessment

Priority: Monitor (action score 31/100)

  • 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: 0.20% (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 3ae75f82c33fa1b4ca2006b55c84f4ef4a428d4d, 66e9f2fb3e753f820bec2a98e8c6387029988320, 6f2eee5457bc48b0426dedfd78cdbdea241a6edb.

Low priority for now. Upgrade to Linux Linux 3ae75f82c33fa1b4ca2006b55c84f4ef4a428d4d, 66e9f2fb3e753f820bec2a98e8c6387029988320, 6f2eee5457bc48b0426dedfd78cdbdea241a6edb 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: Fix memleak when insert_old_idx() failed Following process will cause a memleak for copied up znode: dirty_cow_znode zn = copy_znode(c, znode); err = insert_old_idx(c, zbr->lnum, zbr->offs); if (unlikely(err)) return ERR_PTR(err); // No one refers to zn. Fetch a reproducer in [Link]. Function copy_znode() is split into 2 parts: resource allocation and znode replacement, insert_old_idx() is split in similar way, so resource cleanup could be done in error handling path without corrupting metadata(mem & disk). It's okay that old index inserting is put behind of add_idx_dirt(), old index is used in layout_leb_in_gaps(), so the two processes do not depend on each other.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Dec 24, 2025
Updated
Aug 5, 2026
EPSS
0.2% · 10th percentile
CWE
—

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CNA vs NVD score

NVD
—
CNA · Linux
7.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

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  • when exploit code appears or is weaponized
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  • 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.

—

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

    • 2.6.27affected
    • 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d and later · before cc29c7216d7f057eb0613b97dc38c7e1962a88d2affected · git
    • 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d and later · before 6f2eee5457bc48b0426dedfd78cdbdea241a6edbaffected · git
    • 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d and later · before 66e9f2fb3e753f820bec2a98e8c6387029988320affected · git
    • 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d and later · before 3ae75f82c33fa1b4ca2006b55c84f4ef4a428d4daffected · git
    • 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d and later · before ef9aac603659e9ffe7d69ae16e3f0fc0991a965baffected · git
    • 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d and later · before 79079cebbeed624b9d01cfcf1e3254ae1a1f6e14affected · git
    • 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d and later · before a6da0ab9847779e05a7416c7a98148b549de69efaffected · git
    • 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d and later · before b5fda08ef213352ac2df7447611eb4d383cce929affected · git
    • before 2.6.27not affected · semver

Package-level exposure

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

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

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2023-54047Dec 24, 2025 · drm/rockchip: dw_hdmi: cleanup drm encoder during unbind
    0Monitor
  • ← EarlierCVE-2023-54049Dec 24, 2025 · rpmsg: glink: Add check for kstrdup
    0Monitor
  • Later →CVE-2023-54051Dec 24, 2025 · net: do not allow gso_size to be set to GSO_BY_FRAGS
    0Monitor

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 Linux3ae75f82c33fa1b4ca2006b55c84f4ef4a428d4dVendor (CNA)
Linux Linux66e9f2fb3e753f820bec2a98e8c6387029988320Vendor (CNA)
Linux Linux6f2eee5457bc48b0426dedfd78cdbdea241a6edbVendor (CNA)
Linux Linux79079cebbeed624b9d01cfcf1e3254ae1a1f6e14Vendor (CNA)
Linux Linuxa6da0ab9847779e05a7416c7a98148b549de69efVendor (CNA)
Linux Linuxb5fda08ef213352ac2df7447611eb4d383cce929Vendor (CNA)
Linux Linuxcc29c7216d7f057eb0613b97dc38c7e1962a88d2Vendor (CNA)
Linux Linuxef9aac603659e9ffe7d69ae16e3f0fc0991a965bVendor (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.

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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
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

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