CVE-2023-38429

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2023-07-18. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.2%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

An issue was discovered in the Linux kernel before 6.3.4. fs/ksmbd/connection.c in ksmbd has an off-by-one error in memory allocation (because of ksmbd_smb2_check_message) that may lead to out-of-bounds access.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
49
EG Risk 49/100CISA SSVC

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
Severity98% × 45%
Exploitation1% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
1.2%
EPSS %ILE
66th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 18, 2023

Last Modified

January 3, 2025

Advisory Details (3)

Auto-updated Oct 2, 2026
Patch available.
generic

NetApp Product Security

https://security.netapp.com/advisory/ntap-20250103-0009/
generic

ksmbd: allocate one more byte for implied bcc[0] - kernel/git/torvalds/linux.git - Linux kernel source tree

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/fs/ksmbd?id=443d61d1fa9faa60ef925513d83742902390100f
generic
https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.3.4

Vendor Advisories for CVE-2023-38429(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(9)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-tools-azure (6.2.0.1011.11) @ lunar2026-05-24ubuntu
ubuntulinux-tools-oracle-lts-22.04 (5.15.0.1042.37) @ jammy2026-05-24ubuntu
ubuntulinux-tools-raspi-nolpae (5.15.0.1037.35) @ jammy2026-05-24ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.2.0.32.32) @ lunar2026-05-24ubuntu
ubuntulinux-tools-gkeop-edge (5.15.0.1027.32~20.04.23) @ focal2026-05-24ubuntu
ubuntulinux-virtual-hwe-20.04-edge (5.15.0.83.92~20.04.41) @ focal2026-05-24ubuntu
ubuntulinux-tools-gkeop-5.15 (5.15.0.1027.26) @ jammy2026-05-24ubuntu
ubuntulinux-tools-starfive (6.2.0.1004.7) @ lunar2026-05-24ubuntu
ubuntulinux-tools-intel-iotg (5.15.0.1039.39) @ jammy2026-05-24ubuntu

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

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux6.1.27-1
  • every version up to 6.1.37-1: fixed in 6.1.37-1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 6.3.7-1: fixed in 6.3.7-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 6.3.7-1: fixed in 6.3.7-1
—

Weakness Classification(1)

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

Additional Vendor Advisories

(9)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 7× in last 7d / 25× 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 191 total refreshes for this CVE.

  1. 2026-10-09 20:05 UTCEPSS rescore
  2. 2026-10-08 17:06 UTCEPSS rescore
  3. 2026-10-07 23:46 UTCEPSS rescore
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  23. 2026-08-17 12:44 UTCOSV refresh
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  55. 2026-07-22 14:06 UTCEPSS rescore
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Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2023-38429?
CVE-2023-38429 is a critical vulnerability published on July 18, 2023. An issue was discovered in the Linux kernel before 6.3.4. fs/ksmbd/connection.c in ksmbd has an off-by-one error in memory allocation (because of ksmbdsmb2check_message) that may lead to out-of-bounds access.
When was CVE-2023-38429 disclosed?
CVE-2023-38429 was first published on July 18, 2023, with the most recent update on January 3, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-38429 actively exploited?
CVE-2023-38429 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.2% probability of exploitation in the next 30 days (66th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2023-38429?
CVE-2023-38429 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2023-38429?
A fix for CVE-2023-38429 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2023-38429 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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