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NVD / CVE Program· CNA Linux

CVE-2023-53450: ext4: remove a BUG_ON in ext4_mb_release_group_pa()

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 185062a21976fbc38f2efd296951b02c4500cf65, 463808f237cf73e98a1a45ff7460c2406a150a0b, 53c14e7cc2257191ba15425c15638fc4f8abb92b.

Low priority for now. Upgrade to Linux Linux 185062a21976fbc38f2efd296951b02c4500cf65, 463808f237cf73e98a1a45ff7460c2406a150a0b, 53c14e7cc2257191ba15425c15638fc4f8abb92b 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: remove a BUG_ON in ext4_mb_release_group_pa() If a malicious fuzzer overwrites the ext4 superblock while it is mounted such that the s_first_data_block is set to a very large number, the calculation of the block group can underflow, and trigger a BUG_ON check. Change this to be an ext4_warning so that we don't crash the kernel.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Oct 1, 2025
Updated
Nov 5, 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-2023-53450

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 kernel2.6.25 and later · before 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 5.15.112
  • linux linux kernel5.16 and later · before 6.1.29
  • linux linux kernel6.2 and later · before 6.2.16
  • linux linux kernel6.3 and later · before 6.3.3
  • linux linux kernel6.4

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

    • 2.6.25affected
    • c9de560ded61faa5b754137b7753da252391c55a and later · before d5bf8f7fb3ee3d99d1303ceb54599ea0599a4a5baffected · git
    • c9de560ded61faa5b754137b7753da252391c55a and later · before ef16d8a1798db1a1604ac44ca1bd73ec6bebf483affected · git
    • c9de560ded61faa5b754137b7753da252391c55a and later · before 185062a21976fbc38f2efd296951b02c4500cf65affected · git
    • c9de560ded61faa5b754137b7753da252391c55a and later · before b0fc279de4bf17e1710bb7e83906538ff8f11111affected · git
    • c9de560ded61faa5b754137b7753da252391c55a and later · before 978e5e9111af18741449b81fefd531a622dd969aaffected · git
    • c9de560ded61faa5b754137b7753da252391c55a and later · before d87a4e4094c9879fc8acdff8ce59fdffa979c8e0affected · git
    • c9de560ded61faa5b754137b7753da252391c55a and later · before bf2a16eb4e6d06124bd8436d4546f61539a65f29affected · git
    • c9de560ded61faa5b754137b7753da252391c55a and later · before 53c14e7cc2257191ba15425c15638fc4f8abb92baffected · git
    • c9de560ded61faa5b754137b7753da252391c55a and later · before 463808f237cf73e98a1a45ff7460c2406a150a0baffected · 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-2022-50466Oct 1, 2025 · fs/binfmt_elf: Fix memory leak in load_elf_binary()
    22Monitor
  • ← EarlierCVE-2023-53449Oct 1, 2025 · s390/dasd: Fix potential memleak in dasd_eckd_init()
    22Monitor
  • Later →CVE-2023-53452Oct 1, 2025 · wifi: rtw89: fix potential race condition between napi_init and napi_enable
    18Monitor

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 Linux185062a21976fbc38f2efd296951b02c4500cf65Vendor (CNA)
Linux Linux463808f237cf73e98a1a45ff7460c2406a150a0bVendor (CNA)
Linux Linux53c14e7cc2257191ba15425c15638fc4f8abb92bVendor (CNA)
Linux Linux978e5e9111af18741449b81fefd531a622dd969aVendor (CNA)
Linux Linuxb0fc279de4bf17e1710bb7e83906538ff8f11111Vendor (CNA)
Linux Linuxbf2a16eb4e6d06124bd8436d4546f61539a65f29Vendor (CNA)
Linux Linuxd5bf8f7fb3ee3d99d1303ceb54599ea0599a4a5bVendor (CNA)
Linux Linuxd87a4e4094c9879fc8acdff8ce59fdffa979c8e0Vendor (CNA)
Linux Linuxef16d8a1798db1a1604ac44ca1bd73ec6bebf483Vendor (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.

  • CVE-2026-31739212 days apartcrypto: tegra - Add missing CRYPTO_ALG_ASYNC
    35Monitor
  • CVE-2026-52952266 days apartiommu: Fix WARN_ON in __iommu_group_set_domain_nofail() due to reset
    35Monitor
  • CVE-2025-3980316 days apartscsi: ufs: core: Remove WARN_ON_ONCE() call from ufshcd_uic_cmd_compl()
    31Monitor
  • CVE-2026-31398184 days apartmm/rmap: fix incorrect pte restoration for lazyfree folios
    31Monitor
  • CVE-2026-46117239 days apartRDMA/mana: Remove user triggerable WARN_ON() in mana_ib_create_qp_rss()
    31Monitor
  • CVE-2026-46027238 days apartnet/smc: avoid early lgr access in smc_clc_wait_msg
    30Monitor

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-617 · Reachable Assertion

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. 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