CVE-2023-6121

Kernel: nvme: info leak due to out-of-bounds read in nvmet_ctrl_find_get

MEDIUM
4.3
CVSS Score
Published: November 16, 2023 at 02:45 PM UTC
Updated: October 14, 2026 at 10:17 PM UTC
5 products affected across 2 vendorsEnterprise LinuxSIMATIC S7-1500 CPU 1518-4 Pn /dp MFP FirmwareSiplus S7-1500 CPU 1518-4 Pn /dp MFP Firmware

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Severity
MEDIUM4.3
Exploit prediction
EPSS 2%
SSVC
No known exploit

Description

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).

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Vendor states this is fixed in 0:4.18.0-553.el8_10 (unaffected)
Vendor states this is fixed in 0:4.18.0-553.rt7.342.el8_10 (unaffected)
Vendor states this is fixed in 0:5.14.0-427.13.1.el9_4 (unaffected)
Vendor states this is fixed in 6 (unknown)
Vendor states this is fixed in 7 (unknown)
V3.1.0 ≤ v < V3.1.53.1.0
Affected range stops below V3.1.5, so it looks safe — our inference, not a vendor statement
V3.1.0 ≤ v < V3.1.53.1.0
Affected range stops below V3.1.5, so it looks safe — our inference, not a vendor statement
V3.1.0 ≤ v < V3.1.53.1.0
Affected range stops below V3.1.5, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (9)

VDB Entryx_refsource_REDHATThird Party Advisory
https://access.redhat.com/security/cve/CVE-2023-6121
Issue Trackingx_refsource_REDHATThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2250043
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.debian.org/debian-lts-announce/2024/01/msg00005.html
Source: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
https://cert-portal.siemens.com/productcert/html/ssa-265688.html
Source: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
https://cert-portal.siemens.com/productcert/html/ssa-398330.html

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.3MEDIUMredhat
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-125

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