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NVD / CVE Program· CNA Linux

CVE-2023-54062: ext4: fix invalid free tracking in ext4_xattr_move_to_block()

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: 0.16% (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 1a8822343e67432b658145d2760a524c884da9d4, 4.14.315, 4.19.283.

Low priority for now. Upgrade to Linux Linux 1a8822343e67432b658145d2760a524c884da9d4, 4.14.315, 4.19.283 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: ext4: fix invalid free tracking in ext4_xattr_move_to_block() In ext4_xattr_move_to_block(), the value of the extended attribute which we need to move to an external block may be allocated by kvmalloc() if the value is stored in an external inode. So at the end of the function the code tried to check if this was the case by testing entry->e_value_inum. However, at this point, the pointer to the xattr entry is no longer valid, because it was removed from the original location where it had been stored. So we could end up calling kvfree() on a pointer which was not allocated by kvmalloc(); or we could also potentially leak memory by not freeing the buffer when it should be freed. Fix this by storing whether it should be freed in a separate variable.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Dec 24, 2025
Updated
Oct 15, 2026
EPSS
0.1% · 5th 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 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

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.

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.

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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.

—

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

    • 6.3affected
    • c7851208abffe5ae4deb01cf48763911dc14fc67 and later · before 76887be2a96193cd11be818551b8934ecdb3123faffected · git
    • f5cdc6a7339f250d44d4d469ed7a474ac0d6c7a7 and later · before f30f3391d089dc91aef91d08f4b04a6c0df2b067affected · git
    • 3b28c799a1334adb5a19f42f03abe0d8cbb05938 and later · before ba04d6af5ac440a6d5a2d35dc1d8e2cb0323550aaffected · git
    • d738789ae9ec47d3458a008788f3cdc862ebf0cb and later · before 1a8822343e67432b658145d2760a524c884da9d4affected · git
    • a6744e14ce7045ab1a728bde9595f62fbd39f1d2 and later · before 8beaa3cb293a8f7bacf711cf52201d59859dbc40affected · git
    • 8b6d06b3be7648b3b0f428558293ddf6e2cb94bf and later · before c5fa4eedddd1c8342ce533cb401c0e693e55b4e3affected · git
    • d2efaf8c870c7067b8d1779773134f3481cd8f68 and later · before a18670395e5f28acddeca037c5e4bd2ea961b70aaffected · git
    • 1e9d62d252812575ded7c620d8fc67c32ff06c16 and later · before b2fab1807d26acd1c6115b95b5eddd697d84751baffected · git
    • 1e9d62d252812575ded7c620d8fc67c32ff06c16 and later · before b87c7cdf2bed4928b899e1ce91ef0d147017ba45affected · 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-2026-74705udp: 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-2023-54046Dec 24, 2025 · crypto: essiv - Handle EBUSY correctly
    31Monitor
  • ← EarlierCVE-2023-54048Dec 24, 2025 · RDMA/bnxt_re: Prevent handling any completions after qp destroy
    31Monitor
  • Later →CVE-2023-54071Dec 24, 2025 · wifi: rtw88: use work to update rate to avoid RCU warning
    35Monitor

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 Linux1a8822343e67432b658145d2760a524c884da9d4Vendor (CNA)
Linux Linux4.14.315Vendor (CNA)
Linux Linux4.19.283Vendor (CNA)
Linux Linux5.10.180Vendor (CNA)
Linux Linux5.15.112Vendor (CNA)
Linux Linux5.4.243Vendor (CNA)
Linux Linux6.1.29Vendor (CNA)
Linux Linux6.2.16Vendor (CNA)
Linux Linux76887be2a96193cd11be818551b8934ecdb3123fVendor (CNA)
Linux Linux8beaa3cb293a8f7bacf711cf52201d59859dbc40Vendor (CNA)
Linux Linuxa18670395e5f28acddeca037c5e4bd2ea961b70aVendor (CNA)
Linux Linuxb2fab1807d26acd1c6115b95b5eddd697d84751bVendor (CNA)
Linux Linuxb87c7cdf2bed4928b899e1ce91ef0d147017ba45Vendor (CNA)
Linux Linuxba04d6af5ac440a6d5a2d35dc1d8e2cb0323550aVendor (CNA)
Linux Linuxc5fa4eedddd1c8342ce533cb401c0e693e55b4e3Vendor (CNA)
Linux Linuxf30f3391d089dc91aef91d08f4b04a6c0df2b067Vendor (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
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. SSVC exploitation— → none
  2. 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