CVE-2023-53506

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2025-10-01. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
5%
KEV
Not listed

Published

October 1, 2025

Last Modified

August 5, 2026

Advisory Details (8)

Auto-updated Aug 4, 2026
No patch confirmed yet.
generic

udf: Do not bother merging very long extents - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d52252a1de4cf96a34f722b0cd8902d8ff78eb57
generic

udf: Do not bother merging very long extents - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/adac9ac6d2e04ea0782b91a00ba10706002f3ec4
generic

udf: Do not bother merging very long extents - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9a8d602f0723586e668bae7e65c832ceb9bcc8bc
generic

udf: Do not bother merging very long extents - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/965982feb333aefa9256c0fe188b5f1b958aef63
generic

udf: Do not bother merging very long extents - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/7a965da79f2d22601f329cbfce588386b0847544
generic

udf: Do not bother merging very long extents - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5d029799d381a9ee06209a222cae75f04c5d5304
generic

udf: Do not bother merging very long extents - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/53cafe1d6d8ef9f93318e5bfccc0d24f27d41ced
generic

udf: Do not bother merging very long extents - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3d20e3b768aff32112bdce8d3219d923ae75f9f1

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
linuxKernel @ 4.14.308—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Data Freshness Timeline

(refreshed 15× in last 7d / 46× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 110 total refreshes for this CVE.

  1. 2026-08-05 19:15 UTCEPSS rescore
  2. 2026-08-05 19:15 UTCEPSS rescore
  3. 2026-08-05 10:18 UTCEG score recompute
  4. 2026-08-05 10:18 UTCGHSA enrichment
  5. 2026-08-04 10:57 UTCEG score recompute
  6. 2026-08-04 10:57 UTCGHSA enrichment
  7. 2026-08-04 10:36 UTCEPSS rescore
  8. 2026-08-04 09:30 UTCEG score recompute
  9. 2026-08-04 09:30 UTCGHSA enrichment
  10. 2026-08-03 10:34 UTCEPSS rescore
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  21. 2026-07-23 18:41 UTCOSV refresh
  22. 2026-07-23 14:16 UTCEPSS rescore
  23. 2026-07-23 02:29 UTCEG score recompute
  24. 2026-07-22 23:16 UTCEG score recompute
  25. 2026-07-22 14:07 UTCEPSS rescore
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  1. 2026-07-22 14:07 UTCEPSS rescore
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  22. 2026-07-06 16:26 UTCEPSS rescore
  23. 2026-07-06 16:26 UTCEPSS rescore
  24. 2026-07-06 13:11 UTCOSV refresh
  25. 2026-07-06 02:22 UTCEPSS rescore
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  27. 2026-07-05 02:29 UTCEPSS rescore
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  30. 2026-06-30 23:21 UTCEPSS rescore
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  49. 2026-06-19 19:24 UTCEPSS rescore
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  51. 2026-06-18 17:51 UTCEPSS rescore
  52. 2026-06-18 01:35 UTCOSV refresh
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Frequently asked(5)

What is CVE-2023-53506?
CVE-2023-53506 is a high vulnerability published on October 1, 2025. 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…
When was CVE-2023-53506 disclosed?
CVE-2023-53506 was first published in the National Vulnerability Database on October 1, 2025, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-53506 actively exploited?
CVE-2023-53506 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 95.0% of all scored CVEs.
What is the CVSS score of CVE-2023-53506?
CVE-2023-53506 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2023-53506?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-53506, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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