CVE-2023-6121

MEDIUMNVD 4.34.3—
EchelonGraph scoreMEDIUM confidence

Score 4.3 from GitHub Security Advisory published 2023-11-16. NVD baseline CVSS 4.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
4.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 2%CVSS: 4.3Exploit: NoneExposed: 0

A fix is available — apply it.

An out-of-bounds read vulnerability was found in the NVMe-oF/TCP subsystem in the Linux kernel. This issue may allow a remote attacker to send a crafted TCP packet, triggering a heap-based buffer overflow that results in kmalloc data being printed and potentially leaked to the kernel ring buffer (dmesg).

CVSS v3
4.3
EG Score
4.3(medium)
EG Risk
20(Track)
EG Risk 20/100SSVC: 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
Severity43% × 45%
Exploitation2% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
74.1%
KEV
Not listed

Published

November 16, 2023

Last Modified

June 17, 2026

References (14)

Vendor Advisories for CVE-2023-6121(2)

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

Patch Availability(22)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-aws-lts-20.04 (5.4.0.1120.117) @ focal2026-05-22ubuntu
ubuntulinux-tools-oracle-lts-20.04 (5.4.0.1119.112) @ focal2026-05-22ubuntu
ubuntulinux-virtual-hwe-22.04-edge (6.5.0.25.25) @ mantic2026-05-22ubuntu
ubuntulinux-tools-raspi-nolpae (5.15.0.1048.46) @ jammy2026-05-22ubuntu
ubuntulinux-virtual-hwe-16.04-edge (4.15.0.223.7) @ xenial2026-05-22ubuntu
ubuntulinux-tools-kvm (5.15.0.1052.48) @ jammy2026-05-22ubuntu
ubuntulinux-tools-gke (4.15.0.1160.150) @ xenial2026-05-22ubuntu
ubuntulinux-tools-oem-22.04c (6.1.0.1033.34) @ jammy2026-05-22ubuntu
ubuntulinux-tools-oracle-lts-22.04 (5.15.0.1053.49) @ jammy2026-05-22ubuntu
ubuntulinux-tools-aws (6.5.0.1015.15) @ mantic2026-05-22ubuntu
ubuntulinux-tools-azure (6.5.0.1016.18) @ mantic2026-05-22ubuntu
ubuntulinux-tools-aws-lts-22.04 (5.15.0.1056.55) @ jammy2026-05-22ubuntu
ubuntulinux-tools-intel-iotg (5.15.0.1050.50) @ jammy2026-05-22ubuntu
ubuntulinux-tools-azure-lts-18.04 (4.15.0.1175.143) @ bionic2026-05-22ubuntu
ubuntulinux-tools-azure-lts-20.04 (5.4.0.1126.119) @ focal2026-05-22ubuntu
ubuntulinux-virtual-hwe-18.04-edge (5.4.0.173.191~18.04.141) @ bionic2026-05-22ubuntu
ubuntulinux-tools-azure (4.15.0.1175.141) @ trusty2026-05-22ubuntu
ubuntulinux-virtual-hwe-20.04-edge (5.15.0.100.97) @ jammy2026-05-22ubuntu
ubuntulinux-xilinx-zynqmp-tools-5.4.0-1039 (5.4.0-1039.43) @ focal2026-05-22ubuntu
redhatkernel-0:4.18.0-553.el8_102024-05-22redhat
redhatkernel-rt-0:4.18.0-553.rt7.342.el8_102024-05-22redhat
redhatkernel-0:5.14.0-427.13.1.el9_42024-04-30redhat

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.

Weakness Classification(1)

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

Additional Vendor Advisories

(21)

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 13× 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 117 total refreshes for this CVE.

  1. 2026-07-23 02:30 UTCEG score recompute
  2. 2026-07-22 23:17 UTCEG score recompute
  3. 2026-07-22 14:07 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2023-6121?
CVE-2023-6121 is a medium vulnerability published on November 16, 2023. An out-of-bounds read vulnerability was found in the NVMe-oF/TCP subsystem in the Linux kernel. This issue may allow a remote attacker to send a crafted TCP packet, triggering a heap-based buffer overflow that results in kmalloc data being printed and potentially leaked to the kernel ring buffer…
When was CVE-2023-6121 disclosed?
CVE-2023-6121 was first published in the National Vulnerability Database on November 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-2023-6121 actively exploited?
CVE-2023-6121 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 74.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-6121?
CVE-2023-6121 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2023-6121?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-6121, 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

Explore the affected products and dependency analysis for CVE-2023-6121

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