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NVD / CVE Program· CNA Linux

CVE-2023-53569: ext2: Check block size validity during mount

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: 0.15% (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 0ebfaf14150f55550cffb1148ed3920143c7a69c, 22ab5fed07ad4b206ea910fd0132d1a0d4831584, 451b98155be5dfee05bc6e7c8b30c0be4add3f71.

Low priority for now. Upgrade to Linux Linux 0ebfaf14150f55550cffb1148ed3920143c7a69c, 22ab5fed07ad4b206ea910fd0132d1a0d4831584, 451b98155be5dfee05bc6e7c8b30c0be4add3f71 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: ext2: Check block size validity during mount Check that log of block size stored in the superblock has sensible value. Otherwise the shift computing the block size can overflow leading to undefined behavior.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Oct 4, 2025
Updated
Jun 17, 2026
EPSS
0.1% · 4th 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%

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-2023-53569

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 kernel2.6.12.1 and later · before 4.14.316
  • linux linux kernel4.15 and later · before 4.19.284
  • linux linux kernel4.20 and later · before 5.4.244
  • linux linux kernel5.5 and later · before 5.10.181
  • linux linux kernel5.11 and later · before 5.15.113
  • linux linux kernel5.16 and later · before 6.1.30
  • linux linux kernel6.2 and later · before 6.3.4
  • linux linux kernel2.6.12

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

    • 2.6.12affected
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 0ebfaf14150f55550cffb1148ed3920143c7a69caffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 451b98155be5dfee05bc6e7c8b30c0be4add3f71affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before c4813f858e5c3e4c4659ce95385c1c400c593e1eaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 22ab5fed07ad4b206ea910fd0132d1a0d4831584affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 99f8a15af6c9f0653193104a9e70891f950c6001affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before e6f4fb28890c1361e0db9eb1adee3fc04e7fe7f5affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before c2e7776843a953fd7e48895c3880c277f996193eaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 62aeb94433fcec80241754b70d0d1836d5926b0aaffected · git
    • before 2.6.12not 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-2026-31431crypto: 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-2023-53567Oct 4, 2025 · spi: qup: Don't skip cleanup in remove's error path
    22Monitor
  • ← EarlierCVE-2023-53568Oct 4, 2025 · s390/zcrypt: don't leak memory if dev_set_name() fails
    22Monitor
  • Later →CVE-2023-53570Oct 4, 2025 · wifi: nl80211: fix integer overflow in nl80211_parse_mbssid_elems()
    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 Linux0ebfaf14150f55550cffb1148ed3920143c7a69cVendor (CNA)
Linux Linux22ab5fed07ad4b206ea910fd0132d1a0d4831584Vendor (CNA)
Linux Linux451b98155be5dfee05bc6e7c8b30c0be4add3f71Vendor (CNA)
Linux Linux62aeb94433fcec80241754b70d0d1836d5926b0aVendor (CNA)
Linux Linux99f8a15af6c9f0653193104a9e70891f950c6001Vendor (CNA)
Linux Linuxc2e7776843a953fd7e48895c3880c277f996193eVendor (CNA)
Linux Linuxc4813f858e5c3e4c4659ce95385c1c400c593e1eVendor (CNA)
Linux Linuxe6f4fb28890c1361e0db9eb1adee3fc04e7fe7f5Vendor (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.

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
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-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