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CVE Record

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

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.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2023-53569 is a Linux kernel ext2 mount bug. A malformed ext2 filesystem superblock can contain an invalid block-size value, causing unsafe kernel behavior while the filesystem is mounted. The business concern is mainly systems that mount ext2 disks or images, especially from untrusted sources.

Executive priority

Treat as a targeted operational risk, not an internet-wide emergency based on available evidence. Prioritize kernel patching for systems that mount untrusted ext2 media or images, and handle remaining Linux fleet updates through normal vulnerability management.

Technical view

The ext2 driver did not validate the superblock log block-size field before computing the block size. An invalid value can make the shift operation overflow, producing undefined behavior during mount. The supplied references show stable kernel fixes adding validity checks across multiple kernel branches.

Likely exposure

Exposure is limited to Linux systems using or allowing ext2 filesystem mounts. Risk increases where users, automation, forensic tools, removable media workflows, or image-processing services mount ext2 filesystems from untrusted or externally supplied sources.

Exploitation context

The provided bundle does not show KEV listing, public exploitation, exploit code, or real-world abuse. Exploitation would require triggering ext2 mount processing with malicious filesystem metadata, but the sources do not establish impact beyond undefined behavior.

Researcher notes

Key uncertainty is impact: the source states undefined behavior from a shift overflow during mount, but provides no CVSS, CWE, crash details, privilege boundary analysis, or exploitation evidence. Validation should focus on ext2 mount reachability and fixed-kernel confirmation.

Mitigation direction

  • Update to a vendor kernel containing the referenced ext2 validation fixes.
  • Follow Linux distribution advisories for fixed kernel package versions.
  • Restrict mounting untrusted ext2 media or filesystem images.
  • Limit mount privileges to trusted administrators or controlled automation.
  • Disable unused ext2 support where operationally safe.

Validation and detection

  • Inventory Linux hosts and kernel versions against vendor fixed releases.
  • Identify systems that mount ext2 filesystems or disk images.
  • Review workflows accepting removable media or externally supplied images.
  • Confirm the kernel includes one applicable referenced stable fix.
  • Check distribution security advisories for backported fixes.
Prepared
Confidence
medium
Sources
10

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

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CVE-2023-53569 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
0ADP providers
9Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2unaffected
LinuxLinux2.6.12, 0, 4.14.316, 4.19.284, 5.4.244, 5.10.181, 5.15.113, 6.1.30, 6.3.4, 6.4affected
Weakness

CWE details

No CWE listed

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