LiveActive security incident?Get immediate response
CVE Record

CVE-2023-53506: udf: Do not bother merging very long extents

In the Linux kernel, the following vulnerability has been resolved: udf: Do not bother merging very long extents When merging very long extents we try to push as much length as possible to the first extent. However this is unnecessarily complicated and not really worth the trouble. Furthermore there was a bug in the logic resulting in corrupting extents in the file as syzbot reproducer shows. So just don't bother with the merging of extents that are too long together.

UnknownCVSS not scoredNot KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2023-53506 is a Linux kernel UDF filesystem flaw where handling very long file extents could corrupt file extent metadata. The public record does not provide CVSS, CWE, or impact severity. Treat it as a patching and exposure-management issue for Linux systems that use or process UDF filesystems.

Executive priority

Set priority after confirming whether your environment uses affected kernels and UDF handling paths. With no published CVSS or exploitation evidence in the bundle, this should not outrank actively exploited kernel flaws, but it should enter normal kernel patch governance.

Technical view

The Linux kernel UDF code attempted to merge very long extents by pushing length into the first extent. A logic bug could corrupt file extents, demonstrated by a syzbot reproducer. The fix changes behavior to avoid merging extents that are too long.

Likely exposure

Exposure is most plausible on affected Linux kernels when UDF filesystems are mounted or processed. The source bundle lists affected Linux versions but does not name distributions, appliances, cloud images, or packaged vendor releases.

Exploitation context

The bundle does not cite active exploitation, and KEV is false. Evidence is limited to the kernel CVE description, syzbot reproduction reference in the description, affected version data, and stable kernel fix commits.

Researcher notes

Key gaps are missing CVSS, CWE, distribution mapping, and exploitability detail. The clearest technical evidence is the kernel fix rationale: avoiding overly long extent merging because the previous logic could corrupt extents, as shown by syzbot.

Mitigation direction

  • Upgrade to a Linux kernel or vendor backport containing the referenced UDF fix.
  • Check distribution vendor guidance for CVE-2023-53506 before approving production rollout.
  • Limit handling of untrusted UDF media or images until affected kernels are patched.
  • Prioritize systems that automatically mount or inspect removable or uploaded filesystem images.

Validation and detection

  • Inventory Linux kernel versions across servers, endpoints, and appliances.
  • Compare kernel versions against the affected ranges in the CVE record.
  • Confirm whether each kernel includes a referenced stable fix commit or vendor backport.
  • Identify workloads that mount or process UDF filesystems.
  • Track remediation evidence in vulnerability management records.
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.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cve · low confidence lookup

CVE-2023-53506 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
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, 4.14.308, 4.19.276, 5.4.235, 5.10.173, 5.15.99, 6.1.16, 6.2.3, 6.3affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.