CVE-2023-45898

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2023-10-16. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
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

A fix is available — apply it.

The Linux kernel before 6.5.4 has an es1 use-after-free in fs/ext4/extents_status.c, related to ext4_es_insert_extent.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: 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%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
19%
KEV
Not listed

Published

October 16, 2023

Last Modified

June 17, 2026

Advisory Details (5)

Auto-updated May 12, 2026
No patch confirmed yet.
generic

Patch "ext4: fix slab-use-after-free in ext4_es_insert_extent()" has been added to the 6.5-stable tree — Linux Stable Commits

https://www.spinics.net/lists/stable-commits/msg317086.html
generic

[PATCH] ext4: fix slab-use-after-free in ext4_es_insert_extent()

https://lore.kernel.org/lkml/aa03f191-445c-0d2e-d6d7-0a3208d7df7a%40huawei.com/T/
generic

LKML: Yikebaer Aizezi: KASAN: slab-use-after-free Read in ext4_es_insert_extent

https://lkml.org/lkml/2023/8/13/477
generic

ext4: fix slab-use-after-free in ext4_es_insert_extent() · torvalds/linux@768d612 · GitHub

https://github.com/torvalds/linux/commit/768d612f79822d30a1e7d132a4d4b05337ce42ec
generic
https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.5.4

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-hwe-22.04-edge (6.5.0.14.16) @ mantic2026-05-22ubuntu
ubuntulinux-tools-azure (6.5.0.1010.12) @ mantic2026-05-22ubuntu
ubuntulinux-tools-gcp (6.5.0.1010.10) @ mantic2026-05-22ubuntu

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.

Affected Packages

(2 across 2 ecosystems)
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux—6.5.6-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux—6.5.6-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(4)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 9× 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 156 total refreshes for this CVE.

  1. 2026-08-10 23:57 UTCEPSS rescore
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  1. 2026-07-23 14:16 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2023-45898?
CVE-2023-45898 is a high vulnerability published on October 16, 2023. The Linux kernel before 6.5.4 has an es1 use-after-free in fs/ext4/extentsstatus.c, related to ext4esinsertextent.
When was CVE-2023-45898 disclosed?
CVE-2023-45898 was first published in the National Vulnerability Database on October 16, 2023, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-45898 actively exploited?
CVE-2023-45898 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 80.5% of all scored CVEs.
What is the CVSS score of CVE-2023-45898?
CVE-2023-45898 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2023-45898?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-45898, 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.

Dependency Blast Radius

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