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NVD / CVE Program· CNA Linux

CVE-2023-53672: btrfs: output extra debug info if we failed to find an inline backref

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 28062cd6eda04035d8f6ded2001292ac8b496149, 376b41524b71e494514720bd6114325b0a2ed19c, 400e08a16604b534fdd82c5a288fa150d04f5f79.

Low priority for now. Upgrade to Linux Linux 28062cd6eda04035d8f6ded2001292ac8b496149, 376b41524b71e494514720bd6114325b0a2ed19c, 400e08a16604b534fdd82c5a288fa150d04f5f79 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: btrfs: output extra debug info if we failed to find an inline backref [BUG] Syzbot reported several warning triggered inside lookup_inline_extent_backref(). [CAUSE] As usual, the reproducer doesn't reliably trigger locally here, but at least we know the WARN_ON() is triggered when an inline backref can not be found, and it can only be triggered when @insert is true. (I.e. inserting a new inline backref, which means the backref should already exist) [ENHANCEMENT] After the WARN_ON(), dump all the parameters and the extent tree leaf to help debug.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Oct 7, 2025
Updated
Jun 17, 2026
EPSS
0.1% · 4th 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 · 0.1%

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

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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.

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 kernel3.9.1 and later · before 4.14.326
  • linux linux kernel4.15 and later · before 4.19.295
  • linux linux kernel4.20 and later · before 5.4.257
  • linux linux kernel5.5 and later · before 5.10.197
  • linux linux kernel5.11 and later · before 5.15.133
  • linux linux kernel5.16 and later · before 6.1.55
  • linux linux kernel6.2 and later · before 6.5.5
  • linux linux kernel3.9

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

    • 3.9affected
    • 492104c866cb1b62a11393adccb477f5cd2c7768 and later · before 376b41524b71e494514720bd6114325b0a2ed19caffected · git
    • 492104c866cb1b62a11393adccb477f5cd2c7768 and later · before 400e08a16604b534fdd82c5a288fa150d04f5f79affected · git
    • 492104c866cb1b62a11393adccb477f5cd2c7768 and later · before 7afbfde45d665953b4d5a42a721e15bf0315d89baffected · git
    • 492104c866cb1b62a11393adccb477f5cd2c7768 and later · before b7c3cf2f6c42e6688b1c37215a0b1663f982f915affected · git
    • 492104c866cb1b62a11393adccb477f5cd2c7768 and later · before 6994f806c6d1ae8b59344d3700358547f3b3fe1daffected · git
    • 492104c866cb1b62a11393adccb477f5cd2c7768 and later · before 28062cd6eda04035d8f6ded2001292ac8b496149affected · git
    • 492104c866cb1b62a11393adccb477f5cd2c7768 and later · before e70ba449b04b40584bdabb383d10455397cbf177affected · git
    • 492104c866cb1b62a11393adccb477f5cd2c7768 and later · before 7f72f50547b7af4ddf985b07fc56600a4deba281affected · git
    • before 3.9not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.55-16.1.55-1
Debian:13linuxbefore 6.5.6-16.5.6-1

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-2023-53670Oct 7, 2025 · nvme-core: fix dev_pm_qos memleak
    22Monitor
  • ← EarlierCVE-2023-53671Oct 7, 2025 · srcu: Delegate work to the boot cpu if using SRCU_SIZE_SMALL
    22Monitor
  • Later →CVE-2023-53673Oct 7, 2025 · Bluetooth: hci_event: call disconnect callback before deleting conn
    31Monitor

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 Linux28062cd6eda04035d8f6ded2001292ac8b496149Vendor (CNA)
Linux Linux376b41524b71e494514720bd6114325b0a2ed19cVendor (CNA)
Linux Linux400e08a16604b534fdd82c5a288fa150d04f5f79Vendor (CNA)
Linux Linux6994f806c6d1ae8b59344d3700358547f3b3fe1dVendor (CNA)
Linux Linux7afbfde45d665953b4d5a42a721e15bf0315d89bVendor (CNA)
Linux Linux7f72f50547b7af4ddf985b07fc56600a4deba281Vendor (CNA)
Linux Linuxb7c3cf2f6c42e6688b1c37215a0b1663f982f915Vendor (CNA)
Linux Linuxe70ba449b04b40584bdabb383d10455397cbf177Vendor (CNA)
debian:linux6.1.55-1 · 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. 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